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This emulates the Atari 800. Get it here --> http://virtualdub.org/altirra.html Version 2.00 [December 24, 2011]: Debugger: The step over command has been changed from s to o. [features] UI: Added OS Screen size setting. UI: Added support for gzip compressed images (*.gz, *.atz). UI: Arrow key behavior is now configurable. UI: Added speed options. UI: Added option to control whether emulation sees the Shift key pressed after a Shift+F5 cold reset. UI: Added MRU list for booted images. UI: Color settings can now be exported as a palette file (*.pal). UI: Display API options can now be changed through the GUI (not just cmdline). UI: Added full screen resolution options. UI: Added single instance option. UI: Request 1ms system timer precision only when unpaused. UI: Added option to bind file associations in Windows for image types. UI: Added /run, /disk, /tape, and /cart switches to force load types on the command line. UI: Added mute option. Debugger: Added command aliases (ac, al, as, a8). Debugger: Added watch expression (wx) command. Debugger: Added multiple memory panes. Debugger: Added watch panes. Debugger: Initial version of debug display. Debugger: Disassembler can now display offsets from symbols. Debugger: Profiler now distinguishes between VBIs and DLIs in function sampling mode. Debugger: Profiler now shows unhalted cycle counts and DMA contention rates. Debugger: Added call graph profiling support. Debugger: Mouse wheel is now position-based instead of focus-based. Debugger: Address range breakpoints can now trigger commands. Debugger: Added log output filter commands (lfd/lfe/lfl/lft). Debugger: Added .ide command. Debugger: Enter (e) command now takes expressions. Debugger: Added bitwise/low-byte/high-byte operators and address/value variables to expression evaluator. Debugger: Break on expression command (bx) can now include address ranges. Debugger: Added dump double words (dd) command. Debugger: Go (g) command now has options to preserve and force source mode. Debugger: Added batch (.batch) command. Debugger: Added source mode control (.sourcemode) command. Debugger: Commands can now be queued to run when an EXE loads or runs. Debugger: Source line breakpoints can now be set prior to line debug information being available. Debugger: A matching .atdbg file is now processed when an executable loads. Debugger: startup.atdbg in the program directory is now processed on startup if present. Debugger: Ctrl+Up/Down from output window command line now scrolls log pane by single lines. Debugger: Added fill (f), search (s), and move (m) commands. Debugger: Register ® command can now set individual flags. Debugger: Improved output of .pia command. Debugger: Call, loop, and interrupt collapsing in history window can now be toggled. Debugger: History window can now show timestamps in cycles, unhalted cycles, and microseconds from an anchor point. Debugger: Extended memory syntax now allows access to hidden RAM (r: prefix). Debugger: Added .tape and .tapedata commands. Disk: Added support for Write PERCOM Block command. Disk: Added option to auto-detect firmware overrides of disk accesses and automatically disable SIO patch for those drives. Disk: Live disk images can now be explored directly from the disk drive entry rather than requiring an unmount and remount. Disk: Disk explorer shows timestamps. Disk: .ARC compressed archives can now be explored. Disk: Fixed a couple of bugs with DCM disk image decoding. Cartridge: Added another Atrax 128K cartridge variant used for SpartaDOS X. Cartridge: Added support for OSS 8K, Blizzard 4K, AST 32K, Atrax SDX 64K, Turbosoft 64K, and Turbosoft 128K types. Cartridge: Added support for newer MaxFlash 1MB cartridges that power up in bank 0 instead of bank 127. Cartridge: Added support for 1M Megacart (different type with similar name). Cartridge: Added support for a 5200 64K cartridge with 32K banks. Input: MultiJoy8 support. Input: CX-80 and 5200 trackball support. Input: 1200XL F1-F4 keys can now be enabled in keyboard options. Input: ~ key is now an alternate mapping for the inverse key. IDE: KMK/JZ IDE / IDEPlus 2.0 emulation support. IDE: Initial SIDE emulation support. IDE: Solid-state mode supports up through PIO mode 6. IDE: Read-only physical disk access. GTIA: SECAM support. GTIA: Optimizations to mode 9 and mode 10 rendering. MMU: Added 800 8K/24K/32K/40K configurations. MMU: Added 320K and 576K Compy Shop configurations. MMU: Sped up extended bank switching. Simulator: Added XEGS support. SoundBoard: Multiplier support. POKEY: Rewrote sound core to defer repeating events whenever possible for extra speed. [bugs fixed] ANTIC: Added emulation of bus data displaying at the very right border of a wide scrolled playfield. ANTIC: Improved accuracy of mid scan line changes to HSCROL and DMACTL. ANTIC: Fixed phantom DMA data during WSYNC. ANTIC: Implemented phantom DMA artifacts along right side of wide playfield. ANTIC: Fixed NMIs not being reactivated after a write to NMIRES on cycle 7. Disk: PERCOM block is now initialized for a drive without a disk. Disk: Fixed errors in PERCOM block track and sectors per track counts. Disk: Switching a disk from R/W to VirtRW mode now clears pending flush errors. Disk: Fixed incorrect serial transfer rates for XF551 high speed Put/Write and Write PERCOM commands. Disk: Fixed H: device not handling zero-byte get/puts properly with burst I/O enabled (affected GET/PUT from BASIC). Disk: H: device now supports OPEN with AUX1=7 to fix directory listing from DOS 2.5. Disk: Disk explorer now properly increments volume sequence number when modifying SpartaDOS X images. Disk: DSKINV hook now supports writes to sectors bigger than 128 bytes. Disk: Fixed crash with very short disk images. CPU: Fixed undocumented $BB opcode using abs instead of abs,Y addressing mode. CPU: Undocumented $6B opcode now supports decimal mode. Debugger: Profiler sometimes lost track of intermediate call frames during function sampling. Debugger: Mouse wheel now uses system wheel scroll setting. Debugger: Improved parsing of MADS listings. Debugger: Fixed command escaping so that escapes are no longer processed unless enabled, i.e. \"foo\nbar". Debugger: Register ® can no longer clear bits 4 and 5 of P when unsupported by current CPU mode. Debugger: _ and . are now accepted as part of symbol names in expressions. Debugger: Fixed crash when attempting to load empty file as symbol file. Debugger: Source path matching now allows partial path matches both ways and has improved behavior with duplicate filenames in different directories. Debugger: Fixed wrapping of frame counter in history window. Debugger: Built-in kernel symbols now take priority over loaded symbols. Debugger: Fixed page scrolling in history window after enabling CPU history tracking. IDE: Added mandatory Recalibrate, Read Verify, Read Multiple, Write Multiple, Seek, Set Multiple Mode, and Initialize Device Parameters commands. IDE: Fixed response from device 1 status register. IDE: Improved response from Identify Drive command. IDE: Set transfer mode command is now supported. Cartridge: Reverted OSS 034M mapper back to original bank order and added OSS 043M mapper mode for alternate bank layout. Input: Fixed crash when activating triggers to unavailable controllers. PIA: Implemented IRQB and control bit 6. HLE: Fixed escape handling in display handler. HLE: Screen setup now matches the display list and playfield addressing of the stock OS ROM. HLE: Fixed cartridge handling so that cartridges are run after disk boot completes. HLE: Added known RTS instruction at $E4C0. HLE: CIO now allows SPECIAL commands to be issued on a closed IOCB. HLE: Boot loader now sets DBYTLO/DBYTHI to $0400 before launching. HLE: Fixed crash in CIO on OPEN command with unknown device. HLE: S: now supports the Get Status, line, and fill commands. UI: Disk sector display was incorrect for accelerated writes. UI: Fixed crash if DirectX 9 is not installed. UI: Display window can no longer be undocked in full screen mode. UI: Adjusted default NTSC color preset. The old preset is still available. UI: Command-line processing now better matches standard VC++ escaping rules. UI: Direct3D9/OpenGL rendering now works over Remote Desktop with Windows Vista/7. SoundBoard: Restricted $D5/D6xx mapping to $D500-D53F and $D600-D63F. POKEY: Fixed incorrect latching on IRQST bit 4 (serial output ready IRQ). POKEY: Fixed deassert timing for IRQST bit 3 (serial output complete IRQ). POKEY: Added partial emulation of SKSTAT bit 4 (direct input) during disk transfers. Cassette: Fixed data blocks being silently dropped when reading some .cas files. Cassette: Fixed inaccuracy in data rate produced from loading .cas files. GTIA: Fixed incorrect color for %%1000 pattern in mode 10 with lores ANTIC input. VBXE: Warm reset no longer resets all registers like a cold reset.