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Review of the moment
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This is Topic: Atari 8-bit
Following are the News Items published under this Topic.
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Altirra v4.50 Test 2
Posted by retroK on Sunday, January 18, 2026 - 12:08 (84 Reads)
Topic Atari 8-bit
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Eine neue Testversion des 8-bit Atari Computer Emulators Altirra ist erschienen. Altirra emuliert Atari 400, 800 OS- A/OS-B, 600XL, 800XL, 1200XL, XEGS, A5200 und 130XE.
Note:
- Test 1
- Custom device: Added support for condition variables, serial ports, constant variables and expressions, assignment operators, and debugging.
- Debugger: "@value" now works on read access breakpoints.
- Disk: Added 16:1 DD interleave option.
- Printer: Paper feed position is now shown and can be dragged; fixes for line wrapping on several printer models when exactly filling a line; SVG export support.
- Performance Analyzer: Debug console logging is now captured in a logging channel. The log entries are timestamped and can be correlated against the timeline and the CPU history view. For instance, tracepoints can be set in the debugger to show on the timeline when bytes are read from a receive interrupt.
- Test 2
- Added custom device support for parallel printer ports.
- Added new custom device sample: 1090 serial/parallel card.
- Fixed icons sometimes being cut off in error dialogs.
- Fixed 5200 (4-port) OS being skipped in firmware audit.
- Fixed 5200 carts not binding properly from the command line without /cart.
- Disabled the linear memory setting when Rapidus is enabled, since Rapidus overrides it.
- Fixed Rapidus $4000-7FFF fast RAM overlay not toggling consistently with the extended RAM window.
- An error is now reported if a single instance launch fails because of an issue communicating with the existing instance.
- Added support for non-HDR wide color gamut (WCG) rendering when supported by the OS (requires Windows 11).
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The last entry refers to rendering when the OS has the "Automatically manage color for apps" setting enabled, and allows more accurate saturated colors on displays that have a wider color gamut like DCI-P3 instead of just sRGB. The HDR tab in Screen Effects has been renamed to Advanced Color and it will now also report the gamut coverage of the display based on the color primaries. This is mostly the existing HDR rendering mode without HDR, though support has also been added for soft clipping colors in the display gamut space instead of sRGB.
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Altirra v4.40
Posted by retroK on Thursday, January 01, 2026 - 09:25 (191 Reads)
Topic Atari 8-bit
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Eine neue Version des 8-bit Atari Computer Emulators Altirra ist erschienen. Altirra emuliert Atari 400, 800 OS- A/OS-B, 600XL, 800XL, 1200XL, XEGS, A5200 und 130XE. Altirra ist Open-Source in C++ von Avery Lee.
Note:
- [changes]
- Display: Bloom radius has been reset due to different units.
- UI: Options have been merged from Tools > Options into System > Configure System.
- [features added]
- Cartridge: MaxFlash 1Mbit flash type is now selectable, including recent SST39SF010-based cartridges.
- Cheats: Cheat window is now modeless and resizable.
- Command Line: Specifying more than one image will now stack media slots in order.
- Custom Devices: Memory layers can now be auto-controlled based on OS/BASIC/Self-Test ROM visibility.
- Custom Devices: Improved error display when hot reloading the custom device definition file.
- Debugger: Improved SIODATA trace channel output.
- Debugger: Added .devices and .device_info commands.
- Debugger: Static trace (st) command now has -b option to trace through BRK instructions.
- Debugger: Added block detection support for Z80 disassembly.
- Debugger: .tracecio now reports AUX2 on open commands.
- Debugger: Implemented history for memory pane.
- Devices: Added full emulation for 850 Interface Module.
- Devices: Internal 850 R: handler now blocks Break during concurrent I/O instead of ending concurrent I/O when it is pressed.
- Devices: Standard 850 emulation is now more consistent with DTR/RTS state.
- Devices: Add device list is now sorted by name.
- Devices: Improve timing precision of Indus GT full emulation.
- Devices: Added The Pill device.
- Devices: Added the Black Box Floppy Board.
- Devices: Added Speedy XF disk drive.
- Devices: Added CSS Multiplexer.
- Devices: Added XM301 modem.
- Devices: Added named pipe serial adapter.
- Disk: Add option for reinterleaving to 4:1 SD for SuperSynchromesh.
- Disk: Improved timing correction when accelerating disk reads.
- Disk Explorer: Multiple files can now be exported at a time.
- Display: Added support for screen masks.
- Display: Move screen mask rendering to after color correction to reduce aliasing.
- Display: Improved scaling of bloom filter to different resolutions.
- Display: Added Direct3D 11 custom effect support.
- Display: Added NEON optimizations for PAL high artifacting.
- Firmware: Redesigned firmware dialog.
- Firmware: Added known firmware audit dialog.
- HDevice: Added support for MyDOS XIO 34 (Make Directory) and using XIO 33 (Delete) on directories.
- Input: Added paddle input emulation.
- PerfAnalyzer: Right-drag scrolling is now supported.
- PerfAnalyzer: Added native tracing mode, which profiles the emulator itself.
- PerfAnalyzer: Added option for video trace channel frame size and resizable splitter to change the height of the displayed video channel.
- Printer: 1020 plotter pen colors can now be customized.
- Printer: The printer UI pane now allows selecting between multiple printer outputs.
- Recorder: Added option to pause/resume video recording.
- Recorder: Added support for recording and playback of stereo SAP type R.
- Recorder: Added VGM recording and playback support.
- Simulator: Increased scanlines run at a time to slightly improve speed.
- UI: Added 850 error codes to error decoder.
- UI: Reduced flickering on drive indicators when using full emulation disk drives.
- UI: Removed title bar from docked panes and improved resizing behavior.
- UI: Increased splitter bar size slightly and raised drag thresholds to reduce accidental pane undocking.
- [bugs fixed]
- ANTIC: Fixed line buffer being cleared on blank lines.
- Cartridge: Improved emulation of SpartaDOS X pass-through cartridge port.
- Cartridge: Added reset button for The!Cart.
- Cassette: Fixed recording position not being reset properly when creating a new tape.
- Cassette: Improved accuracy of Vorbis decoding.
- Command Line: /profile command line switch is now case insensitive.
- Custom Devices: Fixed crash when attempting to create a memory layer directly mapping beyond the end of a segment without explicit offset.
- Custom Devices: Fixed a compiler crash when using nested anonymous functions.
- Custom Devices: Added support for unsafe calls, including the ability to issue UI commands.
- Debugger: Improved debugger UI state update when non-debugger commands are used to resume execution.
- Debugger: Fixed .pathdump command repeating instruction lines.
- Debugger: Fixed history view sometimes not displaying effective address on an instruction after stepping from a memory access breakpoint.
- Debugger: Fixed horizontal scroll problems with overscroll in memory window.
- Devices: Fixed Rapidus write-through improperly capturing writes to ROM or extended memory.
- Devices: 1090 registers are now always visible regardless of PBI enable state to match the known PAL equations.
- Devices: Booting off the 1030 with internal firmware now registers T: device properly.
- Devices: Fixed 1030 ModemLink and T: handler download with SIO acceleration enabled.
- Devices: SuperSALT test assembly voltage inputs now reflect computer model differences.
- Devices: Fixed some coprocessors losing cycles when single stepping.
- Devices: Fixed SIDE 3 not being switchable from a controlled cartridge port.
- Devices: Fixed SX212 speed not saving and emulation mode not switching properly.
- Devices: Fixed modem not dialing out to IPv6 addresses.
- Disk: Relaxed standard disk emulator requirements on command frames and ignore overlapping commands for most disk emulation profiles.
- Disk Explorer: Dragging out directories from a MyDOS disk no longer produces a bogus file.
- Disk Explorer: Fixed crashes and directory corruption issues in CP/M filesystem handler.
- Display: Fixed regression in D3D11 driver where bloom broke in full-screen mode.
- Display: Screen effects dialog no longer reports high dynamic range (HDR) is available when the display is configured for wide color gamut (WCG).
- Display: Fixed Enhanced CIO screen editor not wrapping characters properly on Delete Character commands.
- Firmware: The initial "autoselect" state for OS and BASIC firmwares is now always shown.
- GTIA: Fixed intermediate state when switching from CTIA to GTIA on the fly.
- HDevice: Current directory is now cleared on reset.
- HDevice: Long file name encoding/truncation now works for directories.
- HDevice: Fixed relative paths being parsed with the wrong unit's current working directory.
- HLE: Fixed a bug in the fast math acceleration hook for the normalization routine.
- HLE: CIO acceleration now supports multiple devices with the same name but different units, e.g. P3: and P6.
- IDE: CHS translation mappings now round down the number of cylinders instead of rounding up.
- Input: Fixed crash after XInput controller is disconnected.
- Input: Added workaround for Xbox Wireless Controller being detected twice through DirectInput.
- Input: Fixed regression with Keyboard Controller not reading properly in fast pot scan mode.
- Input: POT4-7 inputs are now grounded properly on XL/XE machines.
- PerfAnalyzer: Fixed CPU profile window breaking temporarily after saving a trace.
- PerfAnalyzer: Fixed scrolling artifacts with frame boundary lines.
- PerfAnalyzer: Fixed lockup when pressing Tab.
- POKEY: Improved accuracy of pot scan.
- Recorder: Fixed bitrate not being adjustable for H.264+AAC encoding.
- Recorder: Fixed memory leak when using MediaFoundation-based formats.
- Save States: Fixed bug with active POKEY IRQs getting lost.
- Simulator: Fixed booting a new image sometimes not cancelling a program load in progress.
- Simulator: Loading a program with Open Image no longer forces a cold reset.
- Modem: Fixed intermittent failure to disable Nagle on outgoing connections.
- Modem: Outgoing connections no longer force off server-side echo.
- Modem: Binary mode negotiation is disabled when CR/LF translation is enabled.
- VBXE: Fixed hires artifacts when using attribute map with 1.26 core and extended color, or hires switching at the borders.
- VBXE: Fixed bugs with attribute map horizontal scrolling.
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Altirra v4.40 Test 12
Posted by retroK on Tuesday, May 27, 2025 - 09:16 (382 Reads)
Topic Atari 8-bit
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Eine neue Testversion des 8-bit Atari Computer Emulators Altirra ist erschienen. Altirra emuliert Atari 400, 800 OS- A/OS-B, 600XL, 800XL, 1200XL, XEGS, A5200 und 130XE.
Altirra ist Open-Source in C++ von Avery Lee.
Note:
- Adds custom display effect support for Direct3D 11.
- Fixed cases where the debugger UI did not update when non-debugger commands were used to suspend/resume execution (pause, reset).
- The blank "autoselect" option for firmware is now always visible.
- The hard disk options dialog now rounds down instead of up when guessing cylinder counts from a raw file with no inherent CHS geometry, and allows direct LBA sector limit entry.
- Fixed a PRIOR state handling bug when switching between CTIA and GTIA on the fly.
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The custom display effects code got a major refactor in this version. Besides supporting D3D11 as well as D3D9, it has a few more features now:
- Improved compatibility with .cgp effects due to supporting more undocumented features (//-style comments, PASSPREV, etc). Some .cgp effects still don't work for various reasons, such as using a field called "texture" which is an HLSL reserved keyword, but more effects work out of the box now.
- Custom effect profiling can be enabled by advanced cvar as well as in the .cgp file itself.
- Passes that don't reference the input can be cached for better performance.
- There are now more sample custom effects in the extras folder (which is now a .zip file).
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There are issues specific to the D3D11 custom effects path that can cause issues. The biggest one is an annoying requirement specific to Direct3D 11, VS-PS linkage matching, where the vertex shader must output attributes in the same order as the pixel shader. This is not required by Cg or D3D9, and so effects not written with this in mind will fail to work in D3D11 mode unless adjusted.
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Part of the reason for doing this is that I would like to drop D3D9 mode at some point, but the timeline for doing that is uncertain -- one reason being that Wine's support of D3D11 feature level 9.x is completely broken.
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Altirra v4.40 Test 11
Posted by retroK on Monday, April 21, 2025 - 08:36 (323 Reads)
Topic Atari 8-bit
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Eine neue Testversion des 8-bit Atari Computer Emulators Altirra ist erschienen. Altirra emuliert Atari 400, 800 OS- A/OS-B, 600XL, 800XL, 1200XL, XEGS, A5200 und 130XE.
Altirra ist Open-Source in C++ von Avery Lee.
Note:
- Firmware autodetect now explicitly labels common ATARIOSB.ROM as being related to Xformer.
- Fixed enhanced CIO display not wrapping characters properly between margins on Delete Character.
- Fixed a crash in the custom device compiler with certain patterns of nested anonymous functions.
- Added custom device support for playing sound clips, and a new Electronic Keyboard sample device.
- Added custom device support for issuing emulator UI commands.
- Fixed recording position not being reset properly when mounting a new tape, and auto-select Record when doing so.
- SuperSALT device now modifies SIO +12V, 9VAC, and port 3/4 +5V/GND results based on computer model.
- Merged Tools > Options into System > Configure System.
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Altirra v4.40 Test 10
Posted by retroK on Monday, March 24, 2025 - 09:00 (381 Reads)
Topic Atari 8-bit
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Eine neue Testversion des 8-bit Atari Computer Emulators Altirra ist erschienen. Altirra emuliert Atari 400, 800 OS- A/OS-B, 600XL, 800XL, 1200XL, XEGS, A5200 und 130XE.
Altirra ist Open-Source in C++ von Avery Lee.
Note:
- Rewrote SIO bus handling to allow for per-device command processing.
- Disk emulator now ignores overlapping commands except for Indus GT profile, and allows early SIO command deassertion except for XF551 mode.
- Fixed bug with POKEY IRQs in progress getting lost on save state loads.
- Built-in 1030 firmware now properly installs T: device when ModemLink is booted but not run (e.g. BASIC on).
- Fixed 1030 standard emulation not booting ModemLink with SIO acceleration enabled.
- Improved timing for accelerated disk commands.
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Altirra v4.40 Test 9
Posted by retroK on Tuesday, March 11, 2025 - 07:45 (359 Reads)
Topic Atari 8-bit
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Eine neue Testversion des 8-bit Atari Computer Emulators Altirra ist erschienen. Altirra emuliert Atari 400, 800 OS- A/OS-B, 600XL, 800XL, 1200XL, XEGS, A5200 und 130XE.
Altirra ist Open-Source in C++ von Avery Lee.
Note:
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Has some more fixes to CP/M extent handling. Also, I dropped support for attempting to write sparse files, which I doubt you were hitting but wasn't worth the potential issues. Concrete info on the CP/M 2.2 directory format is hard to find, the main references are pretty vague with how some corner cases of extents are handled.
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I did run into some weirdness with trying to concatenate test files with PIP, as sometimes concatenating files produced shorter output. Wasn't clear if it was due to PIP treating binary files with text or if there was something else causing it to malfunction.
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Altirra v4.40 Test 8
Posted by retroK on Monday, March 10, 2025 - 10:59 (308 Reads)
Topic Atari 8-bit
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Eine neue Testversion des 8-bit Atari Computer Emulators Altirra ist erschienen. Altirra emuliert Atari 400, 800 OS- A/OS-B, 600XL, 800XL, 1200XL, XEGS, A5200 und 130XE.
Altirra ist Open-Source in C++ von Avery Lee.
Note:
- Fixed bug in fast math acceleration normalize routine that could cause small errors.
- 1090 80-column registers are now always visible.
- Some rework internally in the Direct3D11 renderer.
- Fixed Screen Effects dialog sometimes reporting wide color gamut (WCG) displays as HDR capable.
- Updated bloom algorithm with better scaling to smaller displays.
- Fixed bright bar on the right side of screen when using a slot mask.
- Fixed slot mask counter-scrolling artifacts when panning.
- Reduced flickering of drive indicators when using full emulation disk drives.
- Fixed filename matching bug CP/M filesystem handler and crash with missing extents.
- Added The Pill device.
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Altirra v4.40 Test 7
Posted by retroK on Tuesday, February 18, 2025 - 08:34 (481 Reads)
Topic Atari 8-bit
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Eine neue Testversion des 8-bit Atari Computer Emulators Altirra ist erschienen. Altirra emuliert Atari 400, 800 OS- A/OS-B, 600XL, 800XL, 1200XL, XEGS, A5200 und 130XE.
Altirra ist Open-Source in C++ von Avery Lee.
Note:
- Fixed two bugs in VBXE attribute map handling. RES=1 to switch to hires was broken in 1.26 core mode, and RES=0 was not forced properly at the right border.
- Custom devices can now auto-enable memory layers based on system ROM visibility. auto_enable: "osrom|basicrom|selftestrom" will automatically enable or disable a memory layer based on visibility of the OS, internal BASIC, or self-test ROM.
- Reduced duplicate/stale errors being displayed for custom devices.
- .tracecio now reports AUX2 on opens.
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Altirra v4.40 Test 6
Posted by retroK on Sunday, February 09, 2025 - 05:13 (413 Reads)
Topic Atari 8-bit
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Eine neue Testversion des 8-bit Atari Computer Emulators Altirra ist erschienen. Altirra emuliert Atari 400, 800 OS- A/OS-B, 600XL, 800XL, 1200XL, XEGS, A5200 und 130XE.
Altirra ist Open-Source in C++ von Avery Lee.
Note:
- Test 6
- PerfAnalyzer: Fixed incorrect CPU history after saving trace.
- PerfAnalyzer: Fixed scrolling artifacts on frame lines.
- PerfAnalyzer: Right-drag is now supported.
- PerfAnalyzer: Fixed lockup when pressing Tab.
- PerfAnalyzer: Added native tracing support.
- Devices: Fixed Rapidus write-through conflicts on ROM and extended memory.
- Disk Explorer: Fixed dragging out of subfolders from a MyDOS disk producing a bogus file.
- Test 5
- Reduced aliasing on screen masks by switching to a softer antialiasing filter.
- Fixed blending startup crash with extended PAL height displays.
- Fixed artifacts around edges when scrolling 1020 plotter views.
- Fixed canceling some load progress dialogs giving a blank error dialog.
- Fixed a crash in raw tape loading code if decoding errors occurred.
- Fixed dot/slot masks occasionally displaying as vertical stripes in Direct3D 9 mode.
- Fixed dark display in Direct3D 11 mode with screen mask enabled, PAL artifacting on, blending off or interlace on, and color correction disabled.
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Altirra v4.31
Posted by retroK on Sunday, February 09, 2025 - 05:06 (410 Reads)
Topic Atari 8-bit
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Eine neue Version des 8-bit Atari Computer Emulators Altirra ist erschienen. Altirra emuliert Atari 400, 800 OS- A/OS-B, 600XL, 800XL, 1200XL, XEGS, A5200 und 130XE. Altirra ist Open-Source in C++ von Avery Lee.
Note:
- Cassette: Fixed a crash if decoding errors occurred while loading a raw tape.
- Devices: Fixed a crash when adding a device with certain nodes selected.
- Display: Fixed D3D9 gamma correction bugs in specific display configurations with bloom enabled.
- Display: Fixed crash when enabling frame blending at extended PAL height and artifacting enabled.
- Display: Fixed regression in NTSC high artifacting on ARM64 only.
- Input: Fixed console controller inputs being blocked in full-screen mode.
- Printer: Fixed rendering artifacts at edges when scrolling 1020 plotter output at high zoom.
- Printer: Fixed a crash when zooming in on 1020 plotter output on ARM64 only.
- UI: Fixed some cases of empty error dialogs when long operations are cancelled.
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A8DS 4.2
Posted by retroK on Saturday, February 01, 2025 - 01:48 (707 Reads)
Topic Atari 8-bit
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A8DS (ehemals XEGS-DS) ist ein Atari 8-bit Emulator für den Nintendo DS und DSi (Open-Source / C von wavemotion-dave).
Note:
- Fixed Turbo 128K cart type so it doesn't inadvertently disable the cartridge port.
- Added Right-Side cart support for Atari800 (fixing a few A800 emulation issues as well).
- Added Atari 5200 cart support for carts of 128K or less (rename your 5200 carts to ".a52" for easy loading)
- Added new key maps for SHIFT and CONTROL to NDS keys.
- Massive simplification of the configuration handling for machine type.
- New NTSC and PAL color palettes from the awesome Trebor Pro Pack.
- New Caps Lock LED added to all virtual keyboards.
- Added new cart types for SIC+ (1MB), Corina (1MB+EE and 512K+512K+EE), Telelink II and MIO_8, XE Multicart and more...
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a8ds 4.1
Posted by retroK on Saturday, January 25, 2025 - 01:13 (973 Reads)
Topic Atari 8-bit
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a8ds (ehemals XEGS-DS) ist ein Atari 8-bit Emulator für den Nintendo DS und DSi (Open-Source / C von wavemotion-dave).
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a8ds 4.0
Posted by retroK on Monday, January 20, 2025 - 06:00 (659 Reads)
Topic Atari 8-bit
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a8ds (ehemals XEGS-DS) ist ein Atari 8-bit Emulator für den Nintendo DS und DSi (Open-Source / C von wavemotion-dave).
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Altirra v4.40 Test 4
Posted by retroK on Saturday, January 18, 2025 - 08:44 (847 Reads)
Topic Atari 8-bit
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Eine neue Testversion des 8-bit Atari Computer Emulators Altirra ist erschienen. Altirra emuliert Atari 400, 800 OS- A/OS-B, 600XL, 800XL, 1200XL, XEGS, A5200 und 130XE.
Note:
- Test 1
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Adds support for display screen mask emulation, currently supporting aperture grille (Trinitron) and dot triad patterns. This is set up in View > Adjust Screen Effects. It works best with a high resolution display (e.g. 2560x1440 or higher) with high brightness or HDR enabled, as this requires even higher peak brightness than scanlines. The renderer will try to compensate if bloom is enabled, but you'll see moiré patterns on bright colors if you push it too hard.
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Test 2
- Adds full 850 Interface Module emulation.
- 850 standard emulation now matches the transfer speed of the 850, and fixed an issue with inconsistent DTR/RTS state.
- Updated internal 850 R: handler to v0.3 so it matches the Break key behavior of the newer 850 firmware instead of the older 850 firmware.
- On-screen error decoder (Ctrl+Alt+click) now interprets 850-specific CIO error codes.
- SIODATA logging channel now detects and interprets command frames.
- Added vertical slot mask type to mask rendering.
- Fixed a crash in custom device error reporting code.
- Test 3
- Fixed crash in devices tree when adding new devices with certain nodes selected.
- Fixed console key input bindings in input maps being disabled in full screen mode.
- The Add Device dialog now has device names sorted.
- Fixed D3D11 bloom rendering with incorrect gamma in full-screen mode.
- Moved screen mask rendering to post color correction to reduce aliasing artifacts.
- Test 4
- Fixed Direct3D9 rendering artifacts with bloom enabled and some image formats.
- Z80 disassembly now supports block separators.
- Added option to disk dialog to reinterleave a disk to SD 4:1 interleave for Indus SuperSynchromesh.
- Improved timing accuracy of Indus GT full emulation so the Indus Doubler works.
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a8ds 3.9
Posted by retroK on Monday, January 13, 2025 - 06:13 (550 Reads)
Topic Atari 8-bit
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a8ds (ehemals XEGS-DS) ist ein Atari 8-bit Emulator für den Nintendo DS und DSi.
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