Créé par Avery Lee (l’auteur de VirtualDub), il s’agit d’un émulateur d’Atari 8 bits (800/800XL/130XE).

[features added]
– Cartridge: Fixed ID mistake on mappers 1 and 2; added 3, 15, 26-30, 32-38.
– Cartridge: Added dialog to ask for mapper when header is missing.
– Cartridge: Added write support for 1Mb/8Mb flash cartridges.
– Cartridge: Added option to create new 1Mb/8Mb flash cartridges.
– Cartridge: Added option to save cartridge images.
– Cartridge: Added support for AtariMax 1Mb+MyIDE cartridge banking mapper.
– UI: Added /bootvrw and /bootrw to boot disks in read/write or virtual
R/W mode.
– UI: Added /artifact switch for controlling video artifacting.
– UI: Multiple types of images can now be mounted simultaneously via the
command line.
– UI: Added /type switch to push keys on startup.
– UI: Added /cartmapper switch to specify mapper when booting headerless
– UI: Added support for saving settings in an .ini file instead of the
– UI: Added more color presets.
– UI: Added save screenshot command.
– UI: Ctrl+ and Ctrl+Shift+ now produce Ctrl+Esc and Ctrl+Shift+Esc.
– UI: Added /portable mode to switch to Altirra.ini for settings.
– UI: Added help file.
– UI: Disk, cartridge, and tape images can now be loaded from .zip files.
– UI: Heads-up display now indicates H: access.
– Recording: Added video recording.
– Simulator: Added option for faster kernel boot by accelerating checksum
and RAM test routines.
– Simulator: .bin and .xfd extensions now override content-based
identification for images.
– Simulator: BASIC disable now lifts Option key on playfield enable rather
than VBI enable to avoid breaking games that don’t use VBIs.
– Debugger: Added .pathbreak command to stop when new code is executed for
the first time.
– Debugger: Disassembly window now auto-pages when scrolling up or down
beyond the current view.
– Disk: Individual disk drives can now be powered on and off from the Disk
Drives dialog.
– Disk: Improved compatibility of H: device.
– Disk: Added support for H: burst I/O.
– IDE: Added emulation support for MyIDE interface.
– HLE: Rearranged SIO to improve compatibility with naughty programs that
copy out parts of kernel ROM.

[bugs fixed]
– UI: Fixed random crash when opening debugger or new debug panes.
– UI: Booting images on the command line now removes previously mounted
– UI: Fixed Alt+8 keyboard shortcut.
– UI: Remapped Insert/Delete/Home keys to better match their Atari
– UI: Fixed joystick ports 3 and 4 not being mappable.
– UI: Fixed focus anomalies when bringing up profile view undocked.
– UI: Rewrote bicubic pixel shader to fix artifacts on Intel GMA 950.
– UI: Display acceleration is now supported on secondary monitors.
– POKEY: Added support for using channel 2 as serial transmit clock
– POKEY: Unassigned registers now properly read $FF.
– Disk: Increased delay from complete byte to first data in high speed mode
to fix data overruns in SIO-based routines.
– Disk: Fixed bug that caused corruption of newly created disk images during
incremental updates.
– CPU: Fixed bug in DCP opcodes.
– CPU: Added missing ARR #imm ($6B) opcode.
– CPU: Added missing SAX zp,Y ($97) opcode.
– CPU: Added missing XAS abs,Y ($9B) opcode.
– CPU: Fixed ATX #imm ($AB) opcode.
– Debugger: Fixed crash/errors when trying to reopen printer pane after
closing it.
– Debugger: Memory leak fixes.
– Debugger: Fixed disassembly window jumping when changing breakpoints
after selecting a nested call stack frame.
– Debugger: Fixed Alt+Shift+0 shortcut for profiler view.
– Simulator: Fixed bug where BASIC bit wasn’t handled properly in 576K and
1088K memory modes.
– Cartridge: SuperCharger 3D cartridge is now saved and restored properly
across runs.
– HLE: Added initial cassette reading support.
– HLE: Fixed bugs in E: logical line handling in bottom third of screen.
– HLE: Fixed handling of undocumented ZFL entry point in math pack with
accelerated FP disabled (improves compatibility with Atari BASIC).
– HLE: SIO now disables level 2 VBLANK when active.
– HLE: CIO no longer throws an error when closing an IOCB that is not open.
– HLE: CIO now allows opening a device without a colon, i.e. « K ».
– GTIA: Fixed some display artifacts when extended PAL height is enabled.

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