Altirra 2.90 - An 8-bit Atari computer emulator gets a BIG update


In light of the recent Atari news, we've also received word that the 8-bit Atari computer emulator 'Altirra ' is now at version 2.90 containing a number of updates such as CPU: 65C816 CPU speed can now be changed on the fly without a restart, default color presets have been updated, 16-bit surface option for low-end graphics devices, and much much more that can be read in the changelog below. As for the emulator itself, it emulates the Atari 400/800, 1200XL, 600/800XL, 130XE, XEGS, and 5200 systems with full, cycle-exact emulation of all documented hardware features under Windows.

Screenshots may show an earlier version

[features added]

  • Cartridge: Added /nocartchecksum command line switch for loading .CAR files without an initialized checksum field for development.
  • Cassette: Motor restarts and individual sample timings are now randomized when the randomize option is enabled.
  • Cassette: Automatic rewind on cold reset can now be disabled.
  • CPU: 65C816 CPU speed can now be changed on the fly without a restart.
  • Debugger: History window now shows preview of next instruction.
  • Debugger: Added directive and debugger script support for cartridge images.
  • Debugger: Added 'ir' command to read from input ports that have side effects on read.
  • Debugger: Added .tracesio command.
  • Debugger: Added .crc command.
  • Debugger: db (dump bytes) now takes a -w (width) argument.
  • Debugger: st (static trace) now has a -m option to add a symbol for the starting address.
  • Debugger: Added .logopen and .logclose commands.
  • Devices: Improved usability of Devices dialog.
  • Devices: BlackBox and MIO now support multiple devices on the SCSI bus.
  • Disk: Disk drives dialog now supports drag-and-drop.
  • Disk: Disk drives dialog is now resizable (horizontally).
  • Disk: Initial Happy 810 support (memory read/write commands only).
  • Disk: Added support for full disk drive emulation of 810, Happy 810, 810 Archiver, 1050, 1050 Duplicator, US Doubler, Speedy 1050, Happy 1050, Super Archiver, TOMS 1050, Tiger 1050, 1050 Turbo, Indus GT, XF551, ATR8000, and PERCOM RFD-40S1 drives.
  • Disk: Virtual DOS 2 disk image handler now supports preallocation of blocks to work with track buffering.
  • Disk Explorer: Compressed disk images can now be loaded from the Disk Explorer.
  • Disk Explorer: Read/write access is now allowed to SDFS filesystems that have less serious VTOC/bitmap errors (inaccessible sectors only).
  • Display: Added borderless windowed / windowed fullscreen mode (enabled in Options).
  • Display: Added 16-bit surface option for low-end graphics devices.
  • Display: Sharp bilinear filter mode avoids sharpening horizontally if high artifacting is enabled.
  • Display: Reduced luma bleed-through in NTSC artifacting algorithm and added support for modifying the color conversion matrix.
  • Firmware: Added option to export the internal ROM set.
  • GTIA: Added CTIA emulation mode.
  • HLE: Fast boot now accelerates OS startup when Ultimate1MB is active.
  • IDE: KMK/JZ IDE now has a setting to change the PBI device ID.
  • Input: "Hold keys" now allows console button and key combinations to be held down on the next Reset that might be difficult or impossible to hold down normally.
  • Input: Added a keyboard option to allow host keys to be shared between by the keyboard and input maps.
  • POKEY: Improved SIO transfer logging.
  • Profiler: Tabular data can now be copied to the clipboard via right-click option.
  • Simulator: Added power-on delay setting to simulate turning on the computer later than peripherals.
  • Simulator: Added some optional confirmations before automatic resets.
  • UI: Copy/Save Frame now works for XEP-80 display.
  • UI: Added variant of Copy/Save Frame which uses the true pixel aspect ratio with filtering.
  • VBXE: Implemented config latch.
List continues (HERE)

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