• Print

Altirra 3.90 Test 25




  • Emulates the Atari 400/800, 1200XL, 600/800XL, 130XE, XEGS, and 5200 systems.
  • Full, cycle-exact emulation of all documented hardware features.
  • Best-in-class emulation accuracy of undocumented hardware behavior, including undocumented 6502 instructions, precise DMA timing, mid-screen register changes, hardware bugs, and cycle-precise timer IRQs.
  • Support for most popular 8-bit image file formats: ATR, ATX, ATZ, DCM, XFD, PRO, ARC, BAS, ROM, BIN, A52, CAS, SAP.
  • Contains reimplemented versions of OS, BASIC, and handler ROMs to run 8-bit software with high compatibility without needing Atari ROMs.
  • Emulation of over three decades of hardware expansions, including memory expansions, cartridge expansions, Parallel Bus Interface (PBI) devices, modems, and 65C02/65C816 accelerators.
  • Accurate emulation of multiple disk drive types with options for accelerated disk loads, realistic disk timing, and drive sounds.
  • Flexible display with Direct3D/OpenGL acceleration, aspect ratio options, easy resizing, and artifacting support.
  • Audio and video recording, cheat trainer, DOS disk explorer with drag-and-drop, and text mode copy/paste.
  • Powerful debugger with label decoding, source-level stepping, conditional breakpoints/tracepoints, watchpoints, execution history with loop/call/interrupt folding, and profiling.
  • Native Windows UI with theme support, per-monitor high DPI support, file associations, and DirectInput/XInput controllers.
  • Both 32-bit (x86) and 64-bit (x64) versions available.


  • Fixed a couple of crashes in the video recording path in the 32-bit build and for CPUs without SSE4.1 support.
  • Launch help file in dark theme if the emulator is configured for it.
  • Screenshots now have software effects applied when hardware effects are enabled.
  • Fixed SAP type R recorder checking the wrong registers for initial silence detection: it was using AUDFx bits 0-3 instead of AUDCx.
  • Fixed a rare crash when ejecting a disk at a specific time during an unaccelerated disk read.
  • Custom device support updates:
    • Local variables are now supported in script.
    • Fixed broken ! operator in script.
    • Added loop statement.
    • Added support for script cooperative threading.
    • Added support for custom PBI devices.
    • Added support for raw (byte-level) SIO.
    • Added support for asynchronous events between the emulator and network server.
    • Device cold reset is now forced after hot-reload.
    • Added new sample custom devices: R-Verter and raw SIO based disk drive.


Altirra, an 8-bit Atari computer emulator - virtualdub.org





blog comments powered by Disqus