Please Note:  If Upgrading from an earlier version of EightyOne, you may have
to delete the file EightyOne.ini for the new version to operate correctly.
This can be done manually or via Options > Configuration > Reset To Default Settings.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Version 1.39 - 10/06/2023 (by Paul Farrow)
* Bug fixes:
  - Hard reset was not disabling the ZX Printer motor.
  - The ZX Printer emulation was not signalling when the stylus was off the paper.
  - The ZX Printer window was compressing the width of the paper by 2 pixels.
  - The wrong folder was being searched for the ZX Interface 1 ROM.
  - The BASIC Listing import facility was incorrectly interpreting BIN values for the Spectrum.
  - Changed addresses location contents were not being shown correctly in the Memory window when
    it was displaying Hex Words.
* Enhancements:
  - Added emulation of Quicksilva Hi-Res Board.
  - Added a Feed button to the ZX Printer.
  - Added documentation on the use of various hardware interfaces to the Help menu, based on
    original instruction manuals where available.
  - Added shortcuts to the various example programs for the ZX81 to the Help menu, based on
    examples given in the original instruction manuals or books where available.
  - The Memotech Memopak HRG Reset button now only operates when in SLOW mode the match the
    behaviour stated in the interface's instruction manual.
  - Added the 'Chrs Demo' utility by Quicksilva for the QS Character Board.
  - Added the 'UDG' utility by dk'tronics for the dk'tronics 4K Graphics ROM.
  - The BASIC Listing window now refreshes automatically when adding or removing
    BASIC lines for the ZX80, ZX81, TS1000, TS1500, TK85, 16K Spectrum (English),
    48K Spectrum (English) Spectrum+ (English, Spanish), Spectrum 128 (English,
    Spanish), Spectrum+2 (English, French, Spanish), Spectrum+2A (English, Spanish)
    and Spectrum+3 (English, Spanish).
  - Added an option to the Memory window's context menu to dehighlight changed values.

Version 1.38 - 17/05/2023 (by Paul Farrow)
* Bug fixes:
  - ROM based graphic interfaces were not loading the ROMs from the correct subfolder.
  - Memotech HRG could crash when running at 60Hz.
  - Memotech HRG hi-res option required the 8K-16K RAM option enabled but the internal 1K RAM is
    now automatically mapped.
  - G007 hi-res option required the 8K-16K RAM option enabled but the internal 1K RAM is now
    automatically mapped.
  - Since v0.52 it hasn't been possible to select a USB disk for IDE drive HD0 or HD1.
* Changes:
  - QS Character Board switch now defaults to off.
* Enhancements:
  - Example programs included from the Memotech HRG manual.
  - Example programs included from the G007 manual.
  - Example programs included from the dk'tronics Graphics ROM manual.
  - Example programs included from the ZON X-81 manual.
  - Example programs included from the Quicksilva catalogue for the QS Sound Board.
  - Example program created and added to demonstrate the QS Character board.

Version 1.37 - 01/05/2023 (by Paul Farrow and Marc Kloosterman)
* Bug fixes:
  - The ROMs selected for use with the Spectrum 16K, Spectrum+, Spectrum+2A, Spectrum+3,
    TS1000, TC2048 and TS2068 were not being saved correctly to the EightyOne.ini file.
  - Not all keyboard layout images were changing size when double clicked.
  - A breakpoint at $0066 on the Spectrum would never be hit.
  - The emulator no longer crashes when attempting to load an invalid TS2068 ROM cartridge file.
  - The beeper sound option was not always being configured correctly after selecting to load a
    configuration from the Options menu.
* Changes:
  - Renamed the various ROMs for improved clarity and consistency.
  - Created subfolders to separate the various types of ROMs for improved clarity.
  - Removed the non-functioning homebrew 'Spectrum emulator' ROM for the ZX81.
  - Removed the homebew 'Shoulders of Giants' ZX81 ROM.
  - Renamed IDE option 'divIDE V1' to divIDE 57 (R Gal)' and reduced the two option settings
    checkboxes to a single one to reflect the behaviour of the real device.
  - Removed IDE option 'divIDE V2' which did not reflect a real world divIDE device.
  - Renamed the several of the display options for the debugger's Memory Window.
  - Removed the RAM pack wobble facility.
  - Moved selection of TS2068 ROM cartridges from the File menu to the Hardware dialog.
* Enhancements:
  - Added support for 16K and 24K TS1510 ROM cartridges.
  - Added the TS1510 ROM cartridge 'Flight Simulation'.
  - Added the ZX Interface 2 ROM cartridge 'Sinclair ZX Spectrum System Test'.
  - Added the 7 released TS2068 ROM cartridges.
  - Added the Kayde Graphics ROM for the ZX81.
  - Added the ASZMIC ROM version E07 and renamed the existing one as ASZMIC version E04.
  - Updated TR-DOS to version 5.03.
  - updated 'Simple +3e 8-Bit' IDE ROM to version 1.43.
  - Made corrections and improvements to various keyboard layout images.
  - Made improvements to the splash screen image.
  - Added support for the divIDE 'AllRAM' mode (R'' Gal).
  - Added the Nordic ROM for the 48K Spectrum.
  - Added the Arabic ROM for the Spectrum+ and Spectrum 128.
  - Added the Arabic ROM for the Spectrum+2.
  - Added the Arabic ROM for the Spectrum+2A.
  - Added the Arabic ROM for the Spectrum+3, along with support for its ROM selection daughter
    board.
  - Added Arabic keyboard layouts for the Spectrum+, Spectrum 128, Spectrum+2, Spectrum+2A and
    Spectrum+3.
  - Added emulation of the TC2068.
  - Added the 2 released TC2068 ROM cartridges.
  - Added an entry under the Help menu to access the EightyOne release website.
  - Added a facility to write protect RAM in the 8K-16K area (if enabled).
  - Added an option to delete the EightyOne.ini file and reset to default settings.

Version 1.36 - 15/04/2023 (by Paul Farrow)
* Bug fixes:
  - Attempting to load a ZX81 snapshot was throwing an exception.
  - The file handle used to read the ROM symbol file was not being released and after several
    hardware changes the error message "ROM load failed" could occur, which was caused by too
    many files having been left open.
  - RAM pack list could show incorrect entries.
  - Loading a ZX80/ZX81 snapshot did not always restore the hardware settings.
  - Loading a .ace snapshot now automatically selects the Jupiter Ace.
  - Jupiter Ace snapshots were not being saved out correctly.
  - ZX80/ZX81 snapshots now support spaces in ROM file names.
  - ZX80/ZX81 snapshots now support spaces in ROM cartridge file names.
  - Loading a snapshot while the Debugger window was open could result in the Stop/Run button
    state being shown incorrectly.
* Enhancements:
  - Added a keyboard layout image for the Spanish Spectrum+.
  - Added a keyboard layout image for the Spanish Spectrum+2.
  - Added a keyboard layout image for the Spanish Spectrum+2A/Spectrum+3.
  - Added the Spanish Spectrum+ ROM.
  - Drive settings are now saved in snapshots for the ZX80/ZX81 models.

Version 1.35 - 13/04/2023 (by Paul Farrow)
* Bug fixes:
  - Right clicking on a breakpoint would not bring up the menu if the Debugger window was on a
    monitor to the left of the primary monitor.
  - The Debugger facility Step Over became broken due to changes made in the previous release.
  - Prevented temporary breakpoints from being edited.
* Changes:
  - Increased the default threshold level in the Wave Manager.
* Enhancements:
  - Added a 50ms auto refresh facility to the Debugger's Memory window.
  - Added a keyboard layout image for the Spanish Spectrum 128.

Version 1.34 - 31/03/2023 (by Paul Farrow)
* Bug fixes:
  - The printer output was not displaying correctly at the default carriage speed when the style
    was set to Plain Paper.
  - A ZxToken character was not being recognised by the BASIC Listing import facility for the
    ZX81.
  - The BASIC Listing window did not support ZXpand keywords within a REM statement for the ZX80.
  - The BASIC Listing window swapped ZXpand tokens CONFIG and DELETE for the ZX80.
  - The BASIC Listing impact facility swapped ZXpand tokens CONFIG and DELETE for the ZX80.
  - Jupiter Ace snapshots always saved 19K of RAM irrespective of the active RAM pack size.
  - Tape Manager right click context menu was not always appearing. 
* Changes:
  - Amended ZX81 symbol names to match those in The Complete Timex TS1000/Sinclair ZX81 ROM
    Disassembly by Dr Ian Logan and Dr Frank O'Hara.
  - Changed display of RAM sizes from 'k' to 'K'.
  - Removed Settings button on the Hardware dialog.
  - Continuous step debug mode is now disabled by default.
  - Renamed the 'Clock' breakpoint type to 'T-Cycles'.
* Enhancements:
  - Double clicking an existing breakpoint now opens it for editing.
  - The configure breakpoint dialog now has an option to enable/disable the selected breakpoint.
  - The configure breakpoint dialog now has an option to set a hit count for the selected
    breakpoint.
  - Right clicking an existing breakpoint allows it to be disabled/enabled.
  - Right clicking an existing breakpoint that has a hit count defined allows the number of hits
    to be viewed and to be reset.
  - Added a button to allow the number of hits to be reset for all breakpoints.
  - Added a facility to delete all saved configurations.
  - Added a facility to delete selected saved configurations.
  - Added support for saving ZX80 and ZX81 BASIC listings to a text file in ZxToken format.
  - Added Currah uSource ROM support.

Version 1.33 - 22/03/2023 (by Paul Farrow)
* Bug fixes:
  - A crash would occur at start up if no card sound was found. An error message is now displayed
    instead.
* Enhancements:
  - Added Timex Sinclair TS1510 ROM cartridge support, with 3 of the 4 released ROM cartridges.
  - The RAM pack option in the Hardware dialog now adds to the base level RAM applicable to the
    selected computer. A new display shows the total amount of RAM (excluding any RAM present in
    the 8k-16k region).
  - Mirroring of the ROM in the memory map no longer occurs for the TS1500.

Version 1.32 - 13/02/2023 (by Paul Farrow)
* Bug fixes:
  - The Debugger facilities Step Over and Step Out now work when Continuous mode is active.
  - It was not possible to edit an existing 'Clock' or 'Flag' breakpoint.
  - The 'Range' option was incorrectly being made available as a Breakpoint value condition.
  - Adding a Read Memory or Write Memory breakpoint via the right click context menu would
    set up the breakpoint incorrectly.
  - The ZX Printer was not functioning for a ZX80 configured to use the 8K ROM.
* Enhancements:
  - The ZX80 icon in the Hardware dialog now indicates whether the computer is configured to
    use the 4K ROM or the 8K ROM.
  - Added support for ZX80 files to the Wav Loader facility 'Convert Next Block to TZX'.
  - Wav Loader and Tape Manager buttons now get disabled if their functions are not supported
    in the current mode of operation.
  - Added a 'Bring Windows to Front' option to View menu to position all dialogs above the
    main emulation window.
  - Added a right click context menu to the I/O entries in the Debugger window to set
    breakpoints.
  - Added a drop down selection list to the Hardware dialog of the Interface 2 ROM cartridge
    titles released by Sinclair Research, along with the unreleased prototypes produced by
    Parker Brothers.

Version 1.31 - 02/02/2023 (by Paul Farrow)
* Bug fixes:
  - Some ZxToken characters were still not being recognised by the BASIC Listing import facility.
  - Some graphic character encodings were not being recognised by the BASIC Listing import
    facility when loading a program into the Spectrum.
  - Duplicate IN and OUT breakpoints could be added.
  - IN and OUT breakpoints could be edited to become duplicates of existing breakpoints.
  - The Options menu was still showing the Keyboard dialog as selected even after it had been
    closed.
  - Keyboard dialog was not correctly selecting between displaying the Symbol Shift key checkbox
    applicable to all Spectrum models / Jupiter Ace and the CTRL key selection suitable for all
    ZX80 / ZX81 models.
* Enhancements:
  - Added support for IN and OUT breakpoints to the Jupiter Ace.
  - Selecting ZXpand+ in the Hardware dialog now prompts whether to automatically select all
    facilities provided by the ZXpand+.
  - Added ZXpand+ support to the TS1500.
  - The Hardware dialog now provides a selection list of the officially released ROMs for the
    chosen computer.

Version 1.30 - 22/01/2023 (by Paul Farrow)
* Bug fixes:
  - The BASIC Listing import facility did not handle numeric values consisting of just a decimal
    point.
  - ZXpand support was not being enabled for the TS1000.
  - The BASIC Listing window was not nicely handling invalid embedded Spectrum colour control
    codes.
  - The BASIC Listing window was not suppressing a surplus space between keywords if there was
    also an embedded number or embedded control code between the keywords.
  - Some ZxToken characters were not being recognised by the BASIC Listing import facility.

Version 1.29 - 10/06/2022 (by Paul Farrow)
* Bug fixes:
  - The Jupiter Ace beeper port now partially decoded.
  - The Jupiter Ace ROM can now be overwritten if the 'Protect ROM from Writes' option is not
    selected.
  - Beeper sound setting now restored from the .ini file.
  - Now insensitive to the case of the ROM file name.
* Changes:
  - Retired support for the homebrew Spectrum SE.
* Enhancements:
  - Clock accurate emulation of the display mechanism of the ZX81 family of models.
  - Accurate emulation of the display mechanism of the ZX80.
  - Annotation facility of display elements for ZX80 and ZX81 family of models.
  - Displays the number of scanlines in the status bar.
  - Beeper sound for ZX81 models now optionally includes rendering of HSync pulses.
  - Support for Wilf Rigter's Improved Wait circuit.
  - The main window now always gains focus at start up.
  - More robust joystick movement detection.

Version 1.28 - 31/03/2022 (by Paul Farrow)
* Bug fixes:
  - Resolved issue where black bars could appear in the top and bottom border areas, and a white
    bar at the end of the VSync pulse.

Version 1.27 - 23/03/2022 (by Paul Farrow and SirMorris)
* Bug fixes:
  - An ampersand within a label in a ROM symbol file was not being shown in the debugger's
    disassembler window as it was being treated as signifying an underlined accelerator key.
  - Joypad button mapping was causing an issue with third party controllers. All buttons are now
    treated as the fire button so that all controllers work without the need for configuration.
  - Support added for Chroma 80 and Chroma 81 sound output.
  - Various windows, e.g. Tape Manager, were being opened twice.
* Enhancements:
  - Improved display accuracy of HSync and back porch signals.
  - Ability added to deselect display of back porch signals.

Version 1.26 - 03/02/2022 (by Mike Wynne, SirMorris and Paul Farrow)
* Bug fixes:
  - Integrated Mike's sound changes which now use DirectSound to deliver the audio and timing for
    AY emulation. This fixes the significant audio glitching that used to be present in playback.
  - The ZX80 display now aligns properly with the ZX81 and Spectrum for all border size options.
* Changes:
  - Re-ordered items in the Options menu. F-key assignments have been changed for items: Sound,
    Speed and TV Emulation.
  - Moved ZX97 advanced config to Hardware->Homebrew->ZX97->Advanced Settings tab->More button.
    Button is only present when ZX97 Lite is selected system.
* Enhancements:
  - Stereo (ACB) mixing and mono output (default) for the AY emulation are now selectable from the
    Options->Sound menu.

Version 1.25 - 16/01/2022 (by Paul Farrow)
* Bug fixes:
  - Resolved an issue affecting specific pseudo hi-res display driver implementations that would
    cause the first line to misaligned.

Version 1.24 - 05/01/2022 (by Paul Farrow and SirMorris)
* Bug fixes:
  - Loading a snapshot that has Chroma colour enabled was not re-enabling the colour mode.
  - The RAM provided by the Chroma 80 interface was being incorrectly mirrored in the memory map.
  - Changed the default values of bits 6 and 7 when reading port $FE for a Jupiter Ace.
  - Changed the default value of the data bus on the Jupiter Ace from 0xFF to 0x20.
  - Microdrive .MDR files were saved with an incorrect size.
  - Memory window View Words option could lock up for the Spectrum and Jupiter Ace.
  - Memory window View Traditional option defaults to the character set for the selected computer
    model if the default ROM is changed and no corresponding character set bitmap exists.
  - "Access Denied" error dialog no longer gets displayed after taking the PC out of hibernation.
  - The BASIC listing import facility was not detecting Spectrum 128 specific keywords unless
    the 'Accept alternate keyword spellings' option was selected.
  - The BASIC listing import facility was not allowing a line number of 0.
  - Unused bits of ZX Printer input port $FB now return the idle status of the data bus.
  - COPYing a collapsed display on a ZX81 no longer results in corrupt printer output.
  - Resolved issue introduced in version 1.18 that broke support for some custom display drivers,
    i.e. Invaders (Odyssey Computing), HiRes Pacman (Brian Lewis), HiRes Invaders (Brian Lewis)
    and the ASZMIC ROM (Comprocsys).
* Enhancements:
  - Updated ZXpand+ firmware to 't0mte'.
  - Facility to create a blank microdrive file.
  - The BASIC listing import facility now sets a non-zero value for system variable SEED.
  - The BASIC listing import facility now tolerates a wider range of formatting if the 'Accept
    alternate keyword spellings' option is selected.

Version 1.23 - 19/05/2021 (by Paul Farrow)
* Bug fixes:
  - A JR instruction offset to below $0000 or above $FFFF was being displayed incorrectly by
    the disassembler.
* Enhancements:
  - Added support for the 3rd variant of the ZX81 ROM.
  - The BASIC Listing import facility was not trapping lines with identical line numbers.
  - Improved supported for Windows systems configured with larger font sizes.

Version 1.22 - 14/04/2021 (by SirMorris and Paul Farrow)
* Bug fixes:
  - Files SAVEd using ZXpand had their read-only bit set, causing errors when attempting to update
    or delete them.
  - ZXpand's CAT function did not behave correctly with reference to the root folder so certain
    operations would have undefined results.
  - Opening a new tape file whilst execution was stopped in the debugger would restart execution
    yet the debugger would still display as if stopped.
  - The RAM provided by the Chroma 81 interface was being incorrectly mirrored in the memory map.
* Enhancements:
  - Support for the ZxToken format @ directive to encode byte values in BASIC Listing files.

Version 1.21 - 16/02/2021 (by Paul Farrow)
* Bug fixes:
  - The status bar of the BASIC Listing window was not showing the correct program address range
    for the ZX80 and Spectrum.
  - The status bar of the BASIC Listing window was not being cleared when switching to a
    different computer model.
  - The memory shadowing of QS Character mode when Chroma 81 was selected was incorrect.
  - Removal of the close 'X' from the hardware dialog title bar, which was leaving the dialog
    in an incorrect state.
  - Removal of the close 'X' from the Sound Settings dialog title bar, which was leaving the
    dialog in an incorrect state.
  - Removal of the close 'X' from the BASIC Listing Settings dialog title bar, which was leaving
    the dialog in an incorrect state.
  - Cancelling the Load BASIC Listing Options dialog no longer results in a reset.
  - A line highlighted in the BASIC Listing window was not being de-highlighted when clicking
    empty space beyond the end of the program.
  - The continuation marker in a BASIC Listing file is now supported for comment lines.
  - The Discard Redundant Spaces option of the BASIC Listing loader was not removing all surplus
    spaces.
* Enhancements:
  - Updated program icon to have white keys (provided by equin0x80).
  - Selecting a machine specific BASIC Listing file causes an automatic switch to the appropriate
    computer model.
  - The BASIC Listing window now provides a 2x scaling option.
  - Support for loading BASIC Listing files with a .txt extension.
  - Support for loading BASIC Listing files with a .bas extension.
  - Support for loading BASIC Listing files that use ZxToken format extensions.

Version 1.20 - 16/01/2021 (by Paul Farrow)
* Bug fixes:
  - The Z81 snapshot format now identifies the computer model. Existing snapshot files that do
    specify the model are assumed to be for the ZX81.
  - OUT instructions in user programs were affecting the ZX81 picture when in SLOW mode.
  - The ZXpand option was not always enabled for the TS1000 in the Hardware dialog.
  - Unpopulated ROM memory area was not being shadowed correctly for the ZX80.
* Enhancements:
  - Switching the computer model in the Hardware dialog now defaults the sound option for the
    ZX80 and ZX81 models to 'none'.
  - Renamed '128k Spectrum' to 'Spectrum 128' in the Hardware dialog.
  - Removed the QL option from the Hardware dialog since its emulation has never worked properly.
  - Added a Spectrum+ option to the Hardware dialog.
  - Added support for flash loading on the ZX80 with a ZX81 ROM selected.
  - Added support for flash loading on the TK85.
  - Added support for flash loading on the ZX97 Lite.

Version 1.19 - 28/11/2020 (by Paul Farrow)
* Bug fixes:
  - Negative displacements were off by 1 in disassembled instructions.
  - Interrupts were not properly preserved in and restored from Spectrum .SNA files.
  - ZX80 and ZX81 display colours switch to black and white when Chroma colour is enabled and
    frame synchronisation is lost.
* Enhancements:
  - Support for ZX80 pseudo and WRX hi-res modes.
  - Renamed the Chr$ Generator option CHR$16 to CHR$128.
  - Slight adjustment to centre position of the TV horizontal hold control.

Version 1.18 - 30/08/2020 (by Paul Farrow)
* Bug fixes:
  - The lines of a pseudo hi-res display were not correctly aligned.
  - Auto-load did not work for the Timex TS1000 and TS1500.
  - Auto-load was very slow to activate when a greater than 1x speed was selected.
  - The lines of the bottom border of the ZX80 and ZX81 were not correctly aligned.
  - The BASIC Lister did not trap an embedded floating point number encoding that spanned beyond
    the end of a BASIC line, which could prevent the rest of the BASIC listing being displayed,
    e.g. Software Farm's ZX81 game 'Asteroids'.
* Enhancements:
  - Spectrum support for the ZXC1 ROM cartridge.
  - Significant improvement in the timing accuracy of ZX81 SLOW mode.
  - Option to show/hide hardware generated HSync pulses when displaying larger borders.

Version 1.17 - 28/04/2020 (by Paul Farrow)
* Bug fixes:
  - Fixed exception that occurred when resetting a Jupiter Ace.

Version 1.16 - 22/01/2020 (by Paul Farrow)
* Bug fixes:
  - No longer crashes when opening a zip file from the File menu.
  - Corrected Chroma 80 colour mode detection port mask.

Version 1.15 - 21/04/2019 (by SirMorris and Paul Farrow)
* Bug fixes:
  - The zoom size was not being restored from the .ini configuration file.
* Enhancements:
  - Added 'browse to SD card folder' button to ZXpand option in hardware menu.
  - Added z88dk .map symbol parsing to allow easier debugging of C programs.

Version 1.14 - 17/02/2019 (by Paul Farrow and SirMorris)
* Bug fixes:
  - Switching from a custom window size to a fixed size did not always change the size correctly.
  - The drive indicator on the status bar was not always redrawn fully.
  - Entries from Configuration menu did not load all settings.
  - Drive indicator on status bar could appear as a result of a ZXC ROM cartridge menu being
    displayed.
  - Selecting items from the menus before the emulator was fully started up could result in an
    error dialog being displayed.
  - Drag and drop of program files into the main window now works again.
  - Fixed exception that could occur when opening the Profiler Plot window.
  - Updated to latest ZXpand+ firmware, which fixes a 'break' issue with CAT. 
  - Profiler Plot window now displays the latest min and max values.
* Enhancements:
  - Added support for interlace displays when a Chroma interface is selected.
  - Dot crawl can now only be set for non-128K Spectrum models.
  - Improved Hardware window machine icons.
  - Improved Splash Screen image.
  - Added auto-update option to the Profiler window.
  - Improved UI operation of the Profiler and Profiler Plot windows.

Version 1.13 - 31/01/2019 (by Paul Farrow)
* Bug fixes:
  - Only the lower 3 bits of the border value are now saved in Spectrum .Z80 and .SNA snapshots.
  - Accessing address $0525 causes the Program Counter to be advanced if flash loading is
    enabled but no longer does this if a ROM cartridge is loaded.
  - Sound output used to be disabled after a reset.
  - The status bar at the bottom of the emulator window was not always redrawn correctly.
  - Changed the way the emulator window resizes at startup.
  - Save button on TZX Manager's 'Edit General Data Block' dialog was not moved when the form
    was resized.
  - Debug symbols were loaded when a program was opened via the TZX Manager but not if opened
    from the main window's File menu.
  - Corrected the height of the Live Memory View window.
* Enhancements:
  - UDG characters for the Spectrum related models are now shown as their corresponding letters
    but underlined (previously they were shown upside down).
  - The mouse scroll wheel is now supported by the Memory Window.
  - The emulator window can now only be custom resized after first setting the Zoom mode to User
    Defined.
  - A new window allows the BASIC program held in memory to be viewed and saved as a bitmap or
    as a text file (only for ZX80, ZX81 and Spectrum models).
  - Added the ability to read in a BASIC program from a text file (only for ZX80, ZX81 and
    Spectrum models).
  - The status bar at the bottom of the emulator window now indicates when reading or writing to
    a Microdrive cartridge.
  - Added support for various hardware interfaces and settings in .z81 snapshots.
  - Added support for the Spectra interface in .z80 snapshots.
  - Save dialogs now prompt to overwrite an existing file.

Version 1.12 - 14/08/2018 (by Paul Farrow)
* Bug fixes:
  - Corrections to TC2048 keyboard image.
  - Corrections to TC2068 keyboard image.
* Enhancements:
  - Added a window to display the ZX80 Integral Functions next to its keyboard image.
  - Refinement to ZX80 keyboard image.
  - Refinement to ZX80 with ZXpand keyboard image.

Version 1.11 - 06/08/2018 (by Paul Farrow and SirMorris)
* Bug fixes:
  - ZXpand support now works for the ZX80.
* Enhancements:
  - Added keyboard images for:
    - TS2068
    - TC2048
    - Spectrum 16K
    - Spectrum+2
    - Spectrum+2A/+3
    - TS1000 with ZXpand+
    - ZX81 with ZXpand+
    - ZX80 with ZXpand
  - Double clicking the keyboard image window toggles between double and normal size.

Version 1.10 - 23/04/2018 (by Paul Farrow and SirMorris)
* Bug fixes:
  - Sound is now switched off upon a Hard Reset.
  - ZXpand SEEK bug has been fixed.
  - Fixed recursive support of the Step Over debugging facility.
  - Fixed length validation of P81 files.
* Enhancements:
  - A warning is displayed if surplus bytes are found at the end of ZX80 and ZX81 program
    files.
  - Removed the 'mask' option from the breakpoint mechanism.
  - Added separate word and byte Input and Output breakpoint types.
  - Added Register, Flag and Memory breakpoint types.
  - Added the ability to break on a read, write, input or output value as well as its
    address.
  - Added a Profiler tool which provides some visibility into the T-state timing of machine
    code.
  - Symbol file now loaded when opening a program via the Tape Manager's File->Open option.
  - Added a Step Out facility to the debugger.
  - Added keyboard shortcuts for the debugger Step In (Shift+F5), Step Over (Shift+F6),
    Step Out (Shift+F7) and Run/Stop (Shift+F8) buttons.

Version 1.9 - 17/02/2018 (by Paul Farrow)
* Bug fixes:
  - Wav Loader window did not contain all of the waveform after saving.
  - Saving of wav files for the ZX80 now works.
  - The T-states breakpoint counter no longer wraps back to 0 after 65535 but continues
    until 999999, making it easier to see if a ZX80 frame is taking too long.
  - Changed the default value present on the data bus for the ZX80.
  - The 'ROM file not found' dialog would appear after selecting a ROM file from a folder
    outside the default ROM folder.
  - Read breakpoint conditions were not working correctly.
  - Corrected disassembly display of SBC instructions.
  - Fixed Spectrum border corruption when Spectra mode enabled and full frame displayed.
  - Fixed Spectrum border during vsync period when full frame displayed.
* Enhancements:
  - Wav Loader now shows the end of the waveform after saving from a ZX80 or ZX81 when
    auto stop/start is enabled (previously it would show beyond the end of the waveform).
  - Wav Loader now displays the waveform while saving (previously it was always showing
    beyond the end of the waveform).
  - When saving to the Wav Loader from a ZX80, ZX81 or TS1500, the output now drops back
    to the zero level when there is no activity to better represent the waveform that
    would get saved to a cassette.
  - Support for ZXC ROM cartridges provided by the Chroma 80 interface.
  - Added a 'range' option to breakpoints (by SirMorris).
  - Added a 'mask' option to breakpoints.
  - Added a 'not equal' condition to breakpoints.
  - Added support for binary input for memory edits.
  - Removed support for octal entry on memory edit and breakpoint dialogs.
  - TV emulation display artifacts are now disabled by default.
  - Added Keyboard layout image for the Spectrum 128.
  - All windows gathered at start up to ensure they are visible if an existing ini file
    could not be found.
  - Added recursive support for the Step Over debugging facility.

Version 1.8 - 05/11/2017 (by SirMorris)
* Bug fixes:
  - Breakpoints added using the memory / breakpoint menu can now be deleted.
  - ZXpand EEPROM content is now persisted as long as NV_Memory folder exists.
  - Fixed the 'ZXpand saved files have their R/O flag set' bug.
* Enhancements:
  - When using ZXpand emulation or dragging & dropping a .P file onto the UI a file with a
    .sym extension matching that of the selected program will be loaded in the symbol browser.
  - Right clicking a symbol in the Symbol Browser or a line of disassembly in the debug window
    will open the memory / breakpoint menu.
  - Double-clicking a symbol in the browser will add an executable breakpoint at its address.
  - Added the ability to also use NO$GMB format symbol files: pppp:aaaa XXXXXX where pppp is the
    page address (typically 0), aaaa is the CPU address and XXXXXX is the symbol name.
  - Symbol files (.sym) may be loaded into the Symbol Browser by dragging & dropping onto the UI.

Version 1.7 - 09/09/2017 (by SirMorris and Paul Farrow)
* Bug fixes:
  - TZX Manager window now displays punctuation characters in ZX81 file names.
  - Vertical sync period is no longer visible for a Spectrum when in large border mode.
  - Removed blank entry that appeared in the Character Generator selection list under
    the Hardware configuration window.
  - The ROM loaded for the TS1000 when selected in the Hardware window was incorrect.
  - Improved emulation of the interaction between the Chroma interface and the dk'tronics
    Graphics ROM.
* Enhancements:
  - Addition of the Live Memory View for 8-bit machines, which allows monitoring the
    processor's memory accesses in real-time. It tracks bytes of memory which have been
    touched, either by read, write or both.
  - The debugger now allows the use of 'PC', 'HL', 'BC', 'DE', 'IX' and 'IY' in the
    breakpoint address entry field.
  - Integrated ZXpand V1.10 firmware changes.
  - Renamed ZXpand ROM overlay file for the ZX81.
  - Simplified the naming convention of character set bitmap files used by the debugger.
  - Added character set bitmap files for the TS1500, Spectrum+2, Spectrum+3, TK85,
    Jupiter Ace, Lambda 8300, Ringo R470, TC2048 and TS2068.
  - Renamed the Spectrum+3 ROM to include the version number, with the default now
    version 4.1.
  - Included ROMs: Spectrum 128 Spanish, Spectrum+2 Spanish and French, Spectrum+3
    Spanish, Spectrum+3 English versions 4.0 and 4.1.

Version 1.6 - 11/08/2017 (by SirMorris and Paul Farrow)
* Bug fixes:
  - Breakpoints now trigger on both addresses of a 16-bit memory read or write.
* Enhancements:
  - Updated ZXpand emulation to use the ROM and firmware of the ZXpand+ model.
    AY sound is not automatically selected.
  - ROM files have been renamed to follow a consistent scheme:
    [system].[modifier](.[modifier]...)
  - A Save option has been added to the TZX Edit General Data Block window to allow
    saving of ZX80 and ZX81 programs.
  - The character representations of the data shown in the TZX General Data Block
    window can now be viewed using the ZX80 character set.

Version 1.5 - 17/06/2017 (by Paul Farrow)
* Bug fixes:
  - The Chroma colour mode is now disabled upon a soft reset.
  - The SPECTRA colour mode is now disabled upon a soft reset.
  - The ZX81 keyboard image is now deliberately selected using the edition 1 ZX81 ROM.
  - TV Emulation window visibility corrected if SPECTRA selected.
  - Greys out the displayed Chroma mode in the Debug Window when running continuously.
  - Greys out the displayed SPECTRA mode in the Debug Window when running continuously.
  - Greys out the displayed ZXC mode in the Debug Window when running continuously.
  - The Debug Window to now refreshed if it is open when a new hardware configuration
    is selected.
  - If no border was selected then the ZX80 and Lambda 8300 would appear shifted to
    the right by 2 pixels.
  - Displays the correct value in the debug Memory Window while in Word mode when
    address $FFFF is selected.
* Enhancements:
  - Added fine tune control of the scrolling in the debug Memory Window.
  - Enhanced the debug Memory Window to highlight the location value and corresponding
    character when hovered over with the mouse.
  - Added an option to the debug Memory Window to allow the display to show decimal values.
  - Added a search facility to the debug Memory Window.
  - Enhanced the debug breakpoint facility to allow conditional matches (less-than,
    equal-to, greater-than).
  - The 'Delete' breakpoint button in the Debug Window is now greyed out if there are no
    entries present.
  - Highlight in breakpoint entry list adjusted when a new breakpoint is added or an
    existing one removed.
  - The state of the 'Continuous' setting in the Debug Window is now saved as part of the
    configuration settings.

Version 1.4 - 30/05/2017 (by Paul Farrow and SirMorris)
* Bug fixes:
  - Repaired ZXpand support, which was broken following the introduction of the edition 1 ZX81 ROM.
  - Repaired TS1000 support, which was broken following the introduction of the edition 1 ZX81 ROM.
  - The Memory window now refreshes after an edit is made.
  - Re-instated FatTest.vhd for use with the MWCFIDE drive option (which was missing since version 1.0a).
* Enhancements:
  - Added a facility to reverse the listing order in the History window.
  - Added facilities to filter the contents of the History window based on address range.
  - Memory edits are no longer allowed while the debugger is in free running mode.
  - Renamed 'nvram' subfolder as 'NV_Memory'.
  - Renamed 'eeprom.bin' as 'zxpand-eeprom.bin'.
  - ZXpand 'zxpand-eeprom.bin' file now accessed in the 'NV_Memory' subfolder.
  - Removed obsolete ZXpand card.bin file access.
  - Renamed MMC_Card subfolder to ZXpand_SD_Card.
  - Removed obsolete files from the ROM subfolder.

Version 1.3 - 07/05/2017 (by Paul Farrow and SirMorris)
* Bug fixes:
  - The Flash Load mechanism would not load certain programs, e.g. Software Farm's Bouncing Bert.
  - The ZXpand "read only file" problem where the ROM shadow is disabled after loading.
  - The vertical scrollbar shown in the History window was too far over and so was only partially
    visible.
  - Changed how the ZXpand ROM overlay works, which fixed a few problems with demos.
  - Locked the positions of the "Previous/Next Change" buttons within the status bar of the
    Memory window when resizing the window using the grip control.
  - Now correctly displays the address in the Memory window when in 'Word' view mode.
  - The tape block to wav file conversion did not always occur correctly.
  - Changed the number of T-states assumed per frame for the ZX81 and ZX80.
  - File default extension was sometimes .P instead of .O when saving in ZX80 mode.
  - Greys out the I/O area and Display Generation T-States count within the Debug window while
    free running.
  - The ZX Interface 1 RS232 baud rate is now calculated based on machine clock rate rather than
    hard-coded to 3.5MHz.
  - Fixed the alignment of Spectrum characters shown in the Memory window when in 'Traditional'
    view mode.
* Enhancements:
  - ZXpand banner text changed to "ZXPAND EO x.y" to avoid user confusion with the real hardware
    version number.
  - T81 format enhanced to tolerate new block types, specifically the block introduced by the
    81-libretro emulator.
  - Inclusion of edition 1 ZX81 ROM.
  - Included support for the ZX81 edition 1 ROM floating point hardware fix.
  - The disassembler now handles instructions above $8000 on a ZX80/81 where bit 6 of the opcode
    is set.
  - Improved the performance of the History capture feature under the Debug window.
  - Increased history storage to 3000 instructions (was 2000).
  - The History window is now refreshed when it gets resized by the user.
  - Added Clear and Reload options to the History window.
  - The Memory window now displays offset numbers as column headings.
  - The Memory window now displays the address in the status bar when hovering the mouse cursor
    over the Sinclair characters when in 'Traditional' view mode.
  - The Memory and Symbol buttons in the Debug window now toggle the visibility of their
    respective windows.
  - The scrolling mechanism of the Memory window has been enhanced to provide more logical
    behaviour.
  - The Tape Manager used to insert a description block with text "Created with EightyOneTZX".
    This has been changed to "Created using the EightyOne emulator".
  - Added a feature to the Debug window to allow the user to specify the number of T-states that
    are expected to have elapsed between consecutive hits of a specified address, useful for
    verifying timing of flicker-free ZX80 programs.
  - Warn users when file/memory/snap load/save fails.
  - Default position of all windows set to be within typical monitor bounds.
  - Added 'Gather Windows' option to View menu to reposition all dialogs to ensure they appear
    within the monitor bounds.
  - Added 'Enable Splash Screen' option to the View menu.
  - SoundOutput visible status now saved in configuration file.

Version 1.2 - 30/11/2015 (by Paul Farrow)
* Bug fixes to:
  - Words were incorrectly displayed for the stack in debugging window
  - Labels no longer displayed for read, write, input and output breakpoints
  - Writing to Chroma QS Character RAM ignored unless QS Character mode enabled
  - Last IO accesses
* Alteration to Memory Window scrolling

Version 1.1 - 25/11/2015
ZXpand emulation source code lost: http://www.sinclairzxworld.com/viewtopic.php?f=3&t=1477
* Reconstructed ZXpand support (by SirMorris)
* Added support for (by Paul Farrow):
  - Chroma colour interface (see www.fruitcake.plus.com for details of the interface)
  - Spectra colour interface (see www.fruitcake.plus.com for details of the interface)
  - IF2, ZXC2, ZXC3, ZXC4 ROM cartridges (details available at www.fruitcake.plus.com)
  - P81 file format
* Bug fixes to (by Paul Farrow):
  - Jupiter Ace file save
  - Loading multiple ZX80 files
  - T81 file support for ZX80
  - Breakpoint at $0000 can now be hit upon a reset
  - Corrected disassembly mnemonics
  - Resolved lock up when reaching the end of playing a wav file
  - Lambda colour scheme sequence
  - QS Character Board memory size
  - Non-existent memory access
  - ComPort component updated
* Enhancements to debugger window (by Paul Farrow):
  - Controls for breakpoints on memory and IO reads and writes
  - Displays last accessed IO ports
  - Displays Spectra, Chroma and ZXC status modes
  - Increased history storage to 2000 instructions (was 1000)

Version 1.0a Patch X3.7 - 17/10/2012 (by SirMorris)
http://www.sinclairzxworld.com/viewtopic.php?f=3&t=982
* Changed the way that the zxpand emulation works
  - card.bin no longer required
  - all files in folder MMC_CARD are now treated
    as the sd card image.

Version 1.0a Patch X3.5 - 13/01/2012 (by SirMorris)
* Improved ZXpand support for zx81 (see hardware menu)
  - overlay disable is now implemented
  - ZXpand Joystick support works
  - use a real joystick attached to PC or keypad
    in num-lock mode. Keypad 0 is fire, the cursor keys are the directions.
* ZXpand support for zx80
  - mostly working
* Debug window no longer defaults to 'Continuous'

Version 1.0a Patch X3 15/07/2011 (by SirMorris)
http://www.sinclairzxworld.com/viewtopic.php?f=3&t=477
Changes by SirMorris - charlie@eightybits.co.uk
* Added mostly complete ZXpand support for zx81 (see hardware menu)
  - overlay disable / memory map options aren't implemented)
* Added preliminary ZXpand support for zx80
  - not yet working to any usable degree
* Fixed coarse tuning on AY
  - sounds play a lot better but still produce occasional noisy glitch

Version 1.0a Patch - 20/5/2011 (by SirMorris)
http://www.sinclairzxworld.com/viewtopic.php?f=3&t=477&start=8
File: zxpand_emu.zip
* ZXpand emulation DLL update
* Requires previous patch to have been applied

Version 1.0a Patch - 10/5/2011 (by SirMorris)
http://www.sinclairzxworld.com/viewtopic.php?f=3&t=477&start=5
File: eo-zx80-zxpand.zip
* Beginnings of ZX80 support

Version 1.0a Patch - 07/5/2011 (by SirMorris)
http://www.sinclairzxworld.com/viewtopic.php?f=3&t=477&start=7
File: eo-zxpand-patch.zip
* ZXpand V3 ROM
* Test card image

Version 1.0a 28/05/08
http://www.sinclairzxworld.com/viewtopic.php?f=3&t=33
Added Memory Browser (SirMorris)
Added Symbols to Debugger (SirMorris)
Fixed bug in OUTD/OUTIR instructions (MW)
Fixed bug with NMI occasionally triggering twice (MW)

Version 1.0 10/03/08
Vista Compatible

Version 0.52 24/8/07
Added ZX81 Larken disk support. Preliminary support for ZX1541 (Only memory and IEC
interface coded, still have to emulate the 1541 itself). Fixed a bug which caused
the emulator to crash if the workstation was locked/suspended/hibernated.  This
may (but only may!) help with Vista compatability.

Version 0.51 21/7/07
Updated libdsk and lib765 to latest versions. Removed really nasty hack to support
Aszmic ROM and replaced it with a more devious hack.

Version 0.50 8/7/07
Configuration files are now saved in Application Data folder. Added support for
vertical hold in TV emulation. Support for Right shift as Symbol Shift. Lots of 
fixes/several new bugs.

Version 0.43e 30/12/06
Fixed bug with CTRL key in Jupiter ACE emulation. Added support for TZX 1.20
specification.  Previous 1.20Beta TZX files will automatically be updated on saving.
Better emulation of ACF interface, though not working properly yet. Added support for 
ZIP compressed tape/disk images, snapshots etc. Fixed several bugs in TZX->Wav 
conversion. Fixed bug loading/saving .ACE snapshots of machines with 51k RAM.

Version 0.43d 10/11/06
Fixed bug in ATA command 0x91.  Added upload jumper to divIDE. Added PlusD/Disciple/
Opus/+3 Printer port support. Added Currah uSpeech support. Fixed bug in Port 0xfe on
Timex machines. Added Midi support for +2/2A/3 machines (mute the AY chip to hear
the demo tzx). Changed TC2048/Spec SE timing to match 48k spectrum.

Version 0.43c 24/11/06
Fixed bug in the +2A/+3 specific memory models. Read/Write support for all WD177x 
type disk interfaces. Opus Discovery support.
Updated Ace CF interface to latest version of hardware. Fixed dialogues not displaying
correctly when windows is using large fonts. Fixed (again) reversed up/down keys on
the ACE. Fixed limit of 500 blocks per TZX file.

Version 0.43b - 11/11/06
Added support for Piters 16 bit IDE interface. Added Disciple & +D Floppy interface.
Fixed a bug in +2A/+3 paging. Preliminary support for QL emulation (Does nothing
useful at the moment). If EightyOne finds FDC765.DLL available, it uses that
instead of lib765 (more compatible for protected +3 disks).

Version 0.43a - 01/11/06
Added support for Piters 8 bit IDE interface.  Added ability to select ROM files
from other than the ROM directory.

Version 0.43
Added ZX81/ASCII character view in TZX file viewer
Added ability to save screenshots as .bmp files
Readded feature to convert a block from wave->TZX, though this only works for
zx81 style blocks (atm).
Added ACE 96k Ram Pack
Fixed bug in Memotech Hi-Res emulation and added Memotech magic button
Fixed a couple of bugs in Timex graphics modex
Piters CF interface now appears working :)
Added Write Protect to Windows formatted drives. Changed default CHS for USB
connected drives.
Added ability to write to real hard drives/flash cards under divIDE/ZXCF/etc.
Rearranged the Hardware dialogue.  Added Jupiter ACE CF interface.
GDI is back!  You can now select which render method looks/works best for your
system.  Reduced the size of the border slightly in "small border".  The new
size fits a PC screen better in Fullscreen mode. Fixed a bug where you couldn't
load files from ZXCF on a 48k machine.  Added Multiface and Spectrum SE emulation.
Fixed 1Mbyte only config on ZXCF interface.

Version 0.42Z
Fixed a bug in the DirectX library I was using where the program would
crash on certain versions of Windows combined with certain versions
of DirectX (It worked fine with Win98 DX7 & 8 but not Win98 DX9, whereas
it worked fine on XP using DX9).  The application has now been tested
by myself using:

Windows 98SE, DirectX 7.0
Windows ME, DirectX 7.1
Windows ME, DirectX 9.0C
Windows XP, Direct 9.0B
Debian Linux, Wine 0.9.11 (using 'nosound' option).

Version 0.42Y
Rewritten MicroDrive code so FORMAT now works.  Modified custom controls so
EightyOne should be fully skinnable under XP. Fixed a polarity bug in ZX81
emulation when saving to a wav file.  Rewritten display code using directX
giving a huge speed boost.  Added another Jupiter ACE sound board.

Version 0.42X
Fixed Window resizing problems.  Fixed Drag 'n drop of Spectrum snapshot files.
Moved Reset/NMI/Pause controls to separate menu.  Added ability to save/load
multiple configuration files.  Added Interface 1 RS232 & Microdrive support.

Version 0.42W
Kempston Mouse, Plus3E, ZXCF and divIDE support added. Battery backed RAM 
images moved from the ROM folder to NVRAM.

Version 0.42V
Added Spectrum+3 disk drive emulation (Thanks to John Elliot for his excelent
lib765 & libdsk).  The emulator now saves the state of the status bar on exit.

Version 0.42U
Fixed FLASH attribute not working.  Fixed Wave AutoStart/Stop in ACE emulation.
Renamed "Options->Tape->Source/Destination->TZX Manager" to "Tape Manager".
Fixed several bugs preventing EightyOne running smoothly under Windows 98.
Implemented loading/Saving of SNA/Z80 snapshot files.  Fixed timing error in
TC2048 emulation.  Saving memory blocks now works on Spectrum based machines
(Including spectrum .scr files).  Implemented support for Timex .dck files.

Version 0.42T
Fixed Ace up/down keys being reversed. Added ability for the Spectrum to save to
TZX.  Implemented Tap/TXZ support for the Jupiter Ace. Added support for Timex
TC2048/TS2068 machines.  Tightening up of the TV emulation timing stopped Manic
Miner from displaying properly - now fixed. Fixed Lambda Display problems on a
32 bit desktop.  Fixed bug where EightyOne would not start up correctly if the
last time it was closed the debugger was left open.

Version 0.42S
Fixed a bug with Inverse Video Selection  Converted the Wave Loader form to match 
the style of the TZX form (Fixing several bugs in the process).  The Wav Loader 
is now resizable too. Slight improved (though not perfect) 48k memory contention.
Redesigned the Hardware dialogue with icons and everything!

Version 0.42R
Added more colour options to the Artifacts box. Improved TZX handling.  Removed 
the Tape Manager, since all functionality now exists in TZX.  Lambda now has 
sound support (Thanks to Burnttoy for working it out). Preliminary support for 
Lambda .a83 files (read only at the moment).  Expect lots of bugs in this release
(Especialy the load/save code) but please, don't let that stop you reporting them.

Version 0.42Q
Added Spectrum TZX with preliminary acceleration.  Fixed bug where window
contents were not being updated on the ZX81 if in FAST mode. Fixed Sound output
in ACE mode. Changed ghosting for Spectrum so that it accomodates the brightness
attribute.

Version 0.42P 25/02/06
Fixed DDCBxxxx and FDCBxxxx opcodes being displayed incorrectly in the debugger.

Version 0.42O 24/02/06
Fixed a bug where scanlines on ZX81/Ace in non-advanced display mode were always
very dark. Made a start on contention, though it isn't correct yet.

Version 0.42N 24/02/06
Added proper Interlaced video support and improper dot crawl emulation for
spectrum emulation.  Fixed upper and lower border Spectrum border emulation.
Loading wave and csw now works on the Spectrum.  Added 16k, 128k, +2 and
+2A support.

Version 0.42M 18/02/06
Fixed Jupiter ACE screen corruption, and rewrote the core to allow the nice
video actifacts to work on the ACE. Added the ability to select the display mode 
when switching to Full Screen. Also, I think I've gone completely insane and
added something I really shouldn't have.  Welcome to ZX Spectrum emulation ;)
Just don't expect LOAD/SAVE/Sound/Anything at all work, there isn't a proper
keymap (yet) but it's something else to play with.

Version 0.42L 16/02/06
Started commenting the source :-)
More control over the picture in the Artifacts dialogue.
Replaced Play/record/etc. text buttons in TZX/Wave dialogue with icons.  Fixed
several bugs which were causing the TZX manager to crash. Fixed the 
File->Open/Save/New in the main window so you can open any tape format 
(T81/p/o/tzx/wav) without having to open the relevant window. Tidied up the Memory 
block save/load dialog. Added context menu to the tape manager.

Version 0.42K 12/02/06
Fixed the loss of Window size on exit/restart of EightyOne and also when changing
between PAL/NTSC mode. Added Scanlines/Brightness controls to the Display Artifacts
Dialog.

Version 0.42J 11/02/06
You can now click on any value in the Debug window and modify its contents.
Fixed ZX80 loading .o files (again).
Added the facility for the emulated ZX81 to detect the environment it is running in.
See detect.p for an example and the help file for the complete details (eventually).
It appears that the COM port enumeration is also causing some trouble.  To disable 
COM port detection, create a file called "nocomport" in the same directory as 
EightyOne.exe (The contents of this file are irrelevent, merely its existance).
Likewise, you can disable sound by creating the fine nosound in the same directory
as eightyone.exe

Version 0.42I 05/02/06
I thought there would be stuff that got broken with the new core and I was right.  It
appeared that almost every pseudo-Hires game stopped displaying correctly - oops. Fixed
now.

Version 0.42H 02/02/06
More improvements to the Core, plus a new option in the View menu.  You can now select the
amount of border that is displayed around the display.

Version 0.42G 01/02/06
Major changes to the core emulation so that the Calodox Rezurrection demo will work (Great
demo guys!).  It basicly involved removing all the hacks and rewriting the core how it
should have been written in the first place.  No doubt this will introduce piles of new
bugs, but hey...

Version 0.42F 15/01/06
Added Wilfs CHR$16 extended character set and QuickSilva graphics board (Also included is 
a couple of QS games that make use of the board - Asteroids and Scramble). Fixed a bug
where 1 extra byte was saved at the end of a .p file (Thanks to Simon Holdsworth)

Version 0.42E 05/01/06
Preliminary TZX tape format support, still very buggy though.  Fun feature - emulated RAM 
Pack wobble (Press Ctrl-F12 for chuntey on demand). New hardware, DK'Tronics Graphics ROM 
(Thanks to Simon Holdsworth for dumping this).

Version 0.42a 11/09/05
Added TS2050 Serial port. Preliminary support for ACE AY circuit (Clock frequency is
probably very wrong at the moment though).

Version 0.42 09/09/05
Fixed several bugs introduced with the new ROM Handling.  Preliminary support for ZX97/Lite.
Added ACE colour board from ETI magazine. Fixed another bug in the keyboard handler.

Version 0.41 02/09/05
Preliminary Lambda Colour support.  Rom intercepts added to Lambda emulation to support the 
Tape Manager. Fixed Loading/Saving of Zx80 files (Zx80 files are awkward because the Zx80 
doesn't use filenames).  Added keyboard maps for Zx80/Lambda (Maybe these should be ROM
dependant instead of machine dependant?). ACE now supports loading and saving to .t81 files
(seemless conversion between .tap next on the todo list). Added support for M1NOT. Fixed a 
bug where if non-standard video was being produced (Primarily during load/save), the number 
of T-states being executed per 20/16ms timer tick was incorrect.  This was the cause of the
counter in the wavloader appearing to run slow.  WavLoader autostart/stop works again for 
everything except the Ace.  You can now Select TapeManager/WavLoader for Tape source and 
TapeManager/WavLoader/AudioOut for Destination (Audio In comming soon).
Tape loading/Saving interception is now done on a per ROM basis instead of per machine.  This
means if you fire up a ZX81 with the Lambda ROM, it'll use the Lambda intercepts instead of
the ZX81.  If you load an unknown ROM, tape manager will be disabled.  Fixed RAM Shadows so 
that Tree4th & H4th work (again).  Added the ability to load/save blocks of memory to file.

Version 0.40 28/8/05
AY emulation now appears to work, though it does sound a little off-key?

Version 0.39 27/8/05
Fixed two errors in the keyboard scaning code relating to the Shift key [Note - how does 
this affect Symbol shift in ACE emulation?].  Rewritten Display code to speed emulator 
up on slower machines.  Work in progress helpfile added [Note - it's BIG, maybe a 
separate download?]. Removed some unneeded options from the Hardware dialogue. Fixed 
memory accesses to non-existant RAM. Ram pack selection for the Jupiter ACE should work 
now.  Rearranged the Menus.  Redesigned the Wave loader dialogue.

Version 0.38 23/8/05
Memotech & G007 HRG are now fully working.  Frameskipping supported for slower systems.  
I've rearranged the Hardware dialogue to fit the extra options in.  I'm currently working 
on AY emulation and the help file (at last!).  PLEASE NOTE: The roms have been moved into 
a separate ROM subdirectory so they're not cluttering the place up.  If you normally just 
extract the new exe from the archive, please move your roms manually, else EightyOne 
won't work!

Version 0.37 17/8/05
Preliminary release.  Menus rearranged. Support for AY emulation and Beeper/loading noise 
though it sounds pretty rough.  Preliminary support for Memotech/G007 Hi-res cards.  G007 
doesn't work at all at the moment.  Memotech emulation works for the demo:

LET V=19000
RAND USR 8619

But that's about all...

Version 0.36c 14/8/05
Improved timing. Lambda emulation now appears correct-ish.  Support for .ace snapshots.

Version 0.36 7/8/05
Whoooaaa! 9 Months without a release.  Sorry about that - Been stuck without a desktop PC 
for quite a while and the laptop isn't really up to dev work.  Changes?  Erm, some... It 
looks like I fiddled around with the Tape dialog sometime around November last year.  I 
think I changed the Wav->Tap conversion routime to something a little more reliable.  
Snapshot loading/saving should work again.  There's a few changes to the display timing as 
well.

Version 0.35 29/11/04
Fixed a bug in the ROM selection box.  Added Preliminary support for the Lambda ZX81 clone.

Version 0.34 19/11/04
Complete support for the TS1500 ROM.  Note, the TS1500 only supports 16k of RAM.  EightyOne 
will not stop you from selecting a TS1500 with less RAM, however it defaults to 16k and the 
ROM will crash with less memory. The TS1500 also defaults to NTSC mode.

Version 0.33 15/11/04
Moved the display artifacts to it's own dialog with finer control.  Hopefully fixed a bug 
which caused EightyOne to crash sometimes when exiting.

Version 0.32 14/11/04
Fixed the NTSC display. The window shrinks vertically now so it doesn't display the 
vertical retrace.  Added a new feature (at the request of Andre), Display Artifacts.

Version 0.31 11/11/04
Tidied up the Tape Manager (it's now resizable!). Fixed a bug in the interupt generation code.  
This solves a problem where the display would get shifted left or right depending on the code 
used to create it.  H-Forth and TreeForth ROMs now work correctly (They need to be configured 
in a certain way - ROM patches off, 16k of RAM and Shadow RAM on).

Version 0.30 26/10/04
Few more changes.  You can now convert both ways, wav<>(t81,p).

Version 0.29 20/09/04
Lots of changes.  Converting wave files now preserves the silence between files.  EightyOne 
now loads/saves ZX80 .O files.  Lots of small changes throughout the code to tidy a few things 
up.

Version 0.28 19/09/04
Whahey! Two releases in one day (Is that good or bad?).  Tidied the code up a bit.  Fixed a 
few bugs here and there... nothing substantial.  A few things I should have done months ago.  
EightyOne now compiles with only 4 warnings.

Version 0.27 19/09/04
Interim Release.  Preliminary support for converting .wav files to .p/.81.  Should work for 
fairly clean samples but no guarantees for poor quality files.  Conversion the other way 
comming soon.

Version 0.26 23/08/04
Fixed a couple of bugs in the Wav loader.  The sample display was upside down.  EightyOne 
should now load more wav files now too.

Version 0.25 4/1/04
Nothing exciting I'm afraid.  I finally got my lazy ass busy and wrote the code to save/load 
all the setting... It should hopefully remember things like window positions, default 
directories now.

Version 0.24 - 1/1/04
Happy New Year!
OK, I finally got round to fixing the full screen code - mostly. A bit of tidying here and 
there, nothing much.  Still, we're back developing it again.

Version 0.23 - 29/12/03
Wow! Been a couple of months since the last update (Been bust starting my own company and such).
Not many changes, the printer has one or two fixes.  You can now save files on a >32k machine and 
there's a new option for Inverse Video.  Also changes the timers so it should work more smoothly.

Version 0.22 - 10/10/03
Proper support for 16k ROMs as well as <=8k. The Snap file has more information in it now, 
though remains compatible with the version used in 0.21.  You can now drag not only .p/.t81 
but also .wav and .z81 files onto EightyOne.  The Tape Manager and Wav Loader also display 
the current filename in the window title.  There's also more granular control over the 
emulation speed (It's still a logarithmic scale though).

Version 0.21 - 6/10/03
The Snap file format has changed to something a bit more robust, portable and extensible.  Also, 
it's now possible to hack the snap files in notepad or whatever if you so wish. You can now drag 
tape files onto the emulator window and they'll automaticly be inserted.

Version 0.20 - 4/10/03
Removed the Memotech option from the Hardware dialog until I can figure it out.  Instead, there's 
an option to select or deselect True-hires mode.  Enabled, WRX true hires mode works whereas 
disabled, you can use alternate character sets defined in the 8192-16383 memory range.

Version 0.19 - 4/10/03
Tidied up the Hardware dialog box.  Also the Maxdemo now works :)   - The timing was fine, 
however I'd forgotten to treat the second memory fetch of an EDxx instruction as an M1 cycle.  
oops.

Version 0.18 - 2/10/03
1/2 the time, switching between machines wouldn't work properly - fixed this time (hopefully). 
EightyOne finally has its own icon (Thanks to Paul Collins). I renamed the sliders on the 
Printer Control.  Added some functionality to the Fast 'n Dirty Mode so that a lot of true 
hi-res games now work as well as in Accurate mode.  Nothing much today...

Version 0.17 - 1/10/03
Small change to the timing again.  HR-Chess display the left-hand quote around the input now.  
Not many more features I want to do now... maybe saving to wav files. Oh, and I've still to 
code saving its config (Still putting it off).
Other changed include the NMI/INT skip in the debugger now kind of working (There appears to be 
a bug if you try and turn on/off the continuous display while it's executing code).  Another 
small change is the little blue blob that scans across the screen when continuous display is 
enabled - it represents the position of the TVs electron beam.  Oh, and the debugger doesn't 
work well with interlace display turned on because of the way the display is generated.

Version 0.16 - 30/9/03
OK, the debugger seemed to break a lot of other things too. It now has breakpoints though. 
Jupiter Ace emulation is working again, as is the ZX Printer.  There's few setting you can 
choose from for the printer too - they select the horizontal and vertical speed of the 
"carriage".  In fact, moving these about while the ZX81 is printing can produce very realistic 
looking ZX Printer output ;-)  There's a small change in the IM2 timing - ZX-tricator displays 
better now.

Version 0.15 - 30/9/03
It appears that ZX80 emulation got broken somewhere - fixed now.  Also a small change to the 
way ports are handled.  The game "intruder", a space invaders clone (Actually an interesting 
little program.  It was written for the ZX80 and is the only "interactive" flicker free zx80 
game I know of) now works properly.

Version 0.14 - 28/9/03
Todays new feature? - A Debug window.  It's not much use yet until I add something like 
breakpoints or skipping the NMI.  At the moment you end up "debugging" the screen generation 
50% of the time.  Still, it's a start.

Version 0.13 - 27/9/03
Whoops, looks like I left some debug code enabled in last nights release. Whenever you loaded 
a file, it'd stop with a D/0 error afterwards.  Anyway, I've finished off the Wav Loader - it 
doesn't seem quite as prone to the chuntey now and should handle 8/16 bit/mono/stereo samples.  
There was a fairly hefty memory leak too where it would forget to release the sample buffer 
when you loaded a new wav file.  

Version 0.12 - 27/9/03
Added Wav Player.
You can now load a program directly from a wav recording. I've also split the load/save rom 
patch into two separate options, so if you just enable the save patch, you can load a wav file 
then save it out to a .p or .T81.

To load a wav file, do the following:

	1. Go to "Hardware" and ensure the LOAD patch is disabled.
	2. Open up the Wav Loader Window
	3. In the Wav Loader, Click on "Open" and select your wav file.
	   At the moment, only 8bit mono files are supported (Any sample rate
	   though).
	4. You can move about the wav file with the slider.  Position the red bar
	   before the start of the program.
	5. On the ZX81, enter LOAD ""
	6. Press "Play" in the Wav Loader.
	7. If the wind is right and you've crossed all the right fingers,
	   the program will now load into EightyOne.

If you're having problems with noise, try adjusting the Threshold - That's the green
bar.  Anything below it is ignored as noise.

A sample wav file to play with can be found at

http://www.chuntey.com/eightyone/byter.zip

I've also hopefully fixed the problem where EightyOne would sometimes not boot the machine 
properly after a hardware change.

Version 0.11 - 25/9/03
Minor Changes.
Changed Rendering engine slightly.  The first line of Pseudo Hi-res games no longer appears 
corrupt. ZX80 screen appears too far to the right now though... Another look and a lot of things 
appear too far right. grrrr.

Added fps counter.

Added a ROM file selector to the hardware 
Dialog, however it will only let you select rom files in the same directory as the emulator.  I 
really do need to add the code that loads/saves the current config on startup/shutdown.

Fixed small bug where keys like , . ; ' # etc wouldn't work until after shift had been pressed 
and released.

Version 0.1 - 24/9/03
First Public Release.

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Dedicated to Abbey, 1998-2008.

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