[ST] Atari System Emulator (ASE) 1.12 9/09/2026

Atari System Emulator (ASE) 1.12 9/09/2026

This update introduces powerful new visual enhancements, extended hardware support, and significant improvements to core emulation accuracy and compatibility.

What's New

• Drive B: Emulation
• A highly requested feature: Added support for a secondary floppy disk drive (Drive B:).
• New Display Modes. Experience your favorite ST games like never before! Enjoy extended display modes featuring more colors than the original hardware could natively produce, ultra-smooth gradients, and antialiasing for 3D games. Give them a try!
• Bitmap Explorer. Visually inspect the Atari ST's RAM contents in real time. Easily browse, extract, and save sprites, screens, or tiles directly from your favorite games.
• Improvements & Fixes
• Fixed numerous emulation bugs across the board.
• Substantially improved overall compatibility and timing accuracy.

ASE: Atari System Emulator 1.9 7/08/2026

ASE. Prosty i skuteczny.

Dan Dare III (1990, Virgin)

Performance & Optimization

• Speed optimization: Performance improvements to the emulation core. The emulator can now run an Atari ST PAL on a Raspberry Pi 4. (Note: A Raspberry Pi 5 will be required for complete satisfaction).

Bug Fixes

• User Interface: Fixed several visual and interaction bugs across the interface to enhance stability and overall navigation.
• Display scaling fix: Fixed an issue where the ST screen did not fill the entire window when Windows desktop scaling was set above 100%.

ACE-DL release Pico fragrance/Pico Chou! 7/05/2026

• added bank 0 support mapped anywhere for picoSave
• test coordinates to enforce each opened window inside a visible screen
• fix last written address may trigger a new command with picoSave
• fix picoGX trigger during TRACE display
• fix picoGX STOP command (must not write all the time ^_^)

ACE-DL release Pico fragrance/Focus 27/04/26

PicoGX save support via plugin, fix disassembling window size bug
Side-windows more responsive, new BREAK ON VBL, default address mask for breakpoints 

• fix disassembling windows opening from trace shortcut D
• picoGX save support
• side-windows more responsive
• added BREAK ON VBL in breakpoint module
• default adress Mask with memory breakpoint is #FFFF
• display VBL nop count in debug title bar when BAD VBL trigger breakpoint
• added backspace+delete in label search popup when not using keyboard translation

ACE-DL release Enlarge your cartridge 26/03/26

• handle legacy CPR up to 1.5M (XPR support remains for bigger cartridges)
• DSK history add timestamp to OLD version (not new...), the last version keep the original name
• memory explorer windows are now resizable + bigger font
• new option to add a grid over emulation window (see other misc options)
• new option to hide tooltips of the HUD
• do not save file if ESC pressed or focus lost with filename input box
• bugfix EDSK manager crash with kindah textbook case
• bugfix cartridge loader with unknown chunk

ACE-DL release Ergotronics 

• updated SDL to 3.4.2 (more controllers supported + fixes)
• added map carto with memory watchers with disassembling window (R to reset carto)
• added DELETE+BACKSPACE management for digit editable fields
• context menu in trace no more blocking with focus loss
• breakpoints window is now resizable + wheel and better scrollbar in the sheet
• trace window is now resizable in height + better scrollbar for the code
• if a symbol exists for a new breakpoint address, then use it as default name
• close some blocking windows on input focus loss (wont be blocking anymore)
• fix glitches with search popup of memory explorer

AceDL Saucisse 18/02/2026

• updated SDL to 3.4.0
• bugfix regression in breakpoint address mask selection
• bugfix crash when export listing without selecting a file
• bugfix wrong values in DMA debug
• ASIC debug also display current line in Hexa
• ASIC can be unlocked clicking on "Locked &" in ASIC debug window

AceDL 2025 Before New Year's Eve

• ability to execute data after load in memory explorer, with or without AMDSOS header (drag inside center box)
• bugfix Memory explorer emulator mapping in Plus mode... (nobody using it? ^_^)
• bugfix regression in keyboard selection for Mac
• added new translations in configuration menu
• added DSK watcher on all drives (see other misc options)
• added CPC+ chunk decoding when loading ACE snapshot
• added CRTC address next to memory address in graphic explorer
• added hardware sprite highlight (in most standard multiplexing cases)

Caprice Forever

Caprice Forever Release 26.4, 1 April 2026

• Improve FDC emulation
• Populate contextual menu with most used features
• Improve tape audio navigation
• Update OpenAL Soft 1.25.1
• Fix minor bugs.

ACE-DL release = 2025 BND-5 = 03/11/2025

• Raspberry Pi version o/
• Update SDL3 to 3.2.24
• bugfix hardware configuration option submenu
• bugfix joystick configuration (random consideration)
• bugfix interrupt order and ack (thanks to NoRecess)
• bugfix on CRTC-2
• little adjustment in free/adaptive/g-Sync management
• new plugin for MasterCity soundcard (ym2412) thanks to Syx
• Samples and OPL emulation for Play2CPC thanks to Syx
• plugin audio emulation rewritten to fit original ACE management
• cosmetics in AY module
• added interrupt pending in Gate Array visualization
• new command line to disable all windows but the emulator
• do not bother endlessly with DSK to save when user sayed No
• ability to load floppy image in A: or B: by prefixing their names
• added red border with disabled sprite or green border with sprite enable

VB81 XuR Final Release 28/08/2025

• 2005-2025: 20 funny years On this emulator. Just for fun.

VB81 XuR 28/04/2023

• Minor release to improve the ASM compressed screen snapshot.

VB81 XuR 13/08/2022

• "External Processor" added

VB81 XuR 04/06/2022 (minor update)

• Fixed menus, comments and undocumented icons. (Bugs repport from Greg, many thanks for support.)
• Add a full screen mode.

VB81 XuR 21/05/2022 (major update)

• Add a "TASM" compatible Z80 compiler window. (text buffer limited to 64535 bytes)
• Able to recompile the labeled "TASM" files, generated by the inboard disassembler.
• Add a new entry in the Basic converter :
  1 REM [SPH: hex length] and 1 REM [SPD: dec length]
  To build a blank REM line and host your machine code.
• Memotech CIF card; "PRINT AT" error fixed (Thanks Greg !)

VB81 XuR "Paper background" release. 17/05/2022 (minor update)

• Fixed a ZxPrinter bugg (line#8) in the printed picture recently introduced in the previous

VB81 XuR 12/05/2022

• Add a new "6 Bits" entry in the Basic converter: 1 REM [TX6: mytext /~~] (up grey character to end)

VB81 XuR 09/05/2022

• Add the "Asm screen shot" in the "D_File tool" popup menu.

VB81 XuR 08/05/2022

• Tasm export error in case of RAM/ROM special name. (Thanks Greg.)

VB81 XuR 04/05/2022

• ZxPrinter paper for screen shot, line feed.
• "Save printer picture" changed the main Basic path directory... now return to the selected project path.

VB81 XuR 16/04/2022

• ZxPrinter paper background added.

ACE-DL release Service Release 2025/06/30

• Update SDL3 to 3.2.16 version (X11 fullscreen fixes, MacOS Catalina mouse fixes)
• Allow to change memory source in Memory Explorer without going to debug
• Ability to save media (F4 key) from floppy file management
• Ability to change audio driver from configuration menu + saved in configuration
• Fix extended cartridge slot count + NBBK endian read
• Fix SDL3 audio driver selection from command line
• Fix Mono/Stereo switch in Machine configuration (no need to restart emulator to be effective)

ACE-DL release Summer is coming 2025/05/12

• Update SDL3 to 3.2.12 version (more joysticks supported)
• Enforce window position inside available screens
• Cursor navigation in Label search window
• Raise window in case asking for it but already opened
• Stack values in Trace may be clicked to jump to these values
• Bugfix fastSearch in file selector with lower case + reloop on a key

=== 2025 Mars ============

• Trim end of filenames to remove spaces (mostly a ManageDsk problem with existing names)
• Do NOT play Relay Click sample when using CRTC-3 (Plus/GX) model
• Fix window glitch when redefining joystick
• Fix double window blit with Graphic Explorer
• Minor Cathodic filter light propagation enhancement
• Keep line count display in HUD during paused emulation (Trace)
• Ability to click and drag for memory selection in Memory Explorer
• Ability to set end of selection with SHIFT-G (goto) in Memory Explorer

=== 2025 SDL3 Patch 10 ============

• Ability to change gamepad mapping in Joystick configuration
• Ability to change albireo path from command line
• Fix wheel + keyboard inputs in file selector
• Fix binary export of file with wrong header
• Fix language flags transparency display
• Fix databus contention display in configuration
• Fix next file export in ManageDsk (was skipping filename)

=== 2025 SDL3 Patch 9 ============

• Display in trace window title the reason of BREAK
• FDC breakpoints no longer need Winape Break enabled
• Fix backspace key in Search Label window
• Fix joystick configuration trouble (especially with multiple gamepad plugged)
• Force focus on main window after joystick redefinition

=== 2025 SDL3 Patch 7+  ============

• Added online documentation for Memory Explorer
• Update SDL3 to 3.2.8 version (more joysticks supported)
• More responsiveness in the F3 selection menu (using new keyboard routines)
• Fix Keyboard/Gamepad input lags in emulation
• Fix Joystick emulation with keyboard (no more unwanted keyz or conflicts)
• Fix Play2CPC coordinates backup

=== 2025 SDL3 Patch 2 to 6 ============

• Do not always use scaling in fullScreen
• Keep audio buffer settings in configuration file
• Fix memory explorer SDL3 regression...
• Fix inputs in ACE GUI for interactions
• Fix FullScreen surface init
• Fix Audio Crash with 8bits, 16bits audio card and multi-channel only cards
• Ability to map most of unknown keyboard char to GUI

ACE-DL release SDL3 2025/02/26

Major release updating SDL2 to SDL3 (patch 4)
Better FullScreen support, more gamepad/joystick supported (especially XBOX!),
Analog joysticks support for Amstrad Plus, some GUI improvements, virtual keyboard bugfix
Patch 4 - unlock F8/F9/F10 in trace

• Do not always use scaling in fullScreen
• Keep audio buffer settings in configuration file
• Fix memory explorer SDL3 regression...
• Fix inputs in ACE GUI for interactions
• Fix FullScreen surface init
• Ability to map most of unknown keyboard char to GUI

=== 2025 SDL3 ================

• Now using SDL version 3 which include strong internal changes
• New joystick management engine (should fix xbox joystick issue, and more)
• Analog joystick support for Amstrad Plus/GX-4000 + bugs optional emulation
• Improve responsiveness of keyboard inputs in GUI
• Bugfix Virtual keyboard (wasn't exporting keys)
• Highlight modifications in Memory Explorer
• FullScreen now use hardware blit rescale

ACE-DL release Guy Leven 2025/02/11

Minor release solving the problem of moving windows when using lateral taskBar or upper taskBar

• new method for window decoration hack compatible with Ubuntu taskbar and MacOs bars

Ace-DL release JoooOOOOooonnnvier! 22/01/2025

new misc. options for EDSK autosave and versioning, ability to save tiles/sprites in graphic explorer
new debug features, breakpoints may be toggled from trace and watchers are displayed green in trace...

What's new

• upgraded iMPdraw rom pack to sept 2024
• new options for EDSK autosave and versioning
• ability to save Tiles/Sprites in graphic explorer
• ability to load RASM symbols chunk in Cartridge (get new Rasm!)
• ability to toggle all execution breakPoints from Trace with key 'T'
• execution breakPoints in watcher mode are now green in Trace

Ace-DL release Noël/Christmas 24-26/12/2024

Spanish traductions, new shortcuts..

• spanish translations for the GUI (see flags with F12)
• ability to use (L)abels to jump in memory from Graphics Explorer
• +/- from numeric keypad change emulation output volume

Ace-DL release  O.D.I.L.E 14/12/2024

• added new traductions
• added FullScreen mode for Linux/Windows users (F11 key)
• upgrade width/height limit to 512 in Graphics Explorer
• added Amsdos header option for Memory import in configuration saves
• now you can resize Graphics Explorer window + size saved in configuration
• display an error message when a file is not supported (instead of simply discarding it)
• bugfix step over in trace with HALT, LDIR, CPIR and other 'looped' instructions
• bugfix number of selected Upper Rom, displayed in Gate Array window
• bugfix number of selected bytes after a successful search
• bugfix recovery of explorers coordinates after close/reopening

Ace-DL release  Quetta 18/11/2024

Nowe filtry graficzne... W kolejności od góry Raw, CTM, Trinitron, Atari, GT green, GT grey.

New Atari Screen filter, Configuration Save/Load, Partial translation in French (option), bugfixes

• new extra Timer to increase ACE refresh accuracy
• added Atari SC1224 monitor emulation
• Added configuration SAVE/LOAD in configuration main menu
• Added configuration select from command line
• Left-clic on Reset must not reinitialise extended memory
• Command line option to select another Audio driver (AceDL -h for help)
• all GUI almost translated in French (optional)
• bugfix plastic cover size with CTM filters
• bugfix ACE breakpoints + evolutions

Ace-DL release  Helloween/BND-4 26/10/2024

Dandanator automatic Basic/Gaming modes switch
can import native ACE breakpoints from RASM (get new release)

• Dandanator goes to Basic mode without cartridge to avoid side effects
• new button in Machine configuration to reinit the entire machine (no plugin, no rom, no breakpoints)
• import of natives ACE breakpoints from RASM symbol file
• may click Timer in Trace to reset nop counter
• may press F7,F8,F10 when trace mode but focused on another window
• added HOME/END and Shift+HOME/END in memory explorer to navigate in memory and selection
• more persistence for CRTC register value change
• bugfix underline for CRTC selected register

Ace-DL release  Oktober Fest/Back To School 2/10/2024

Memory Explorer, GUI bugfixes and enhancements

• LibSDL upgraded to 2.30.7
  
• updated UNIDOS+packs to v1.51
  
• try to create .config directory for settings if it does not exists (Linux/Mac)
  
• Breakpoint activation when click ON the instruction (no more half screen or something...)
  
• Memory explorer can see/edit Dandanator ROM
  
• Memory explorer can see/edit Play2CPC Cartridge
  
• new debug module for Dandanator (with internal registers)
  
• new command line option for delaying autotype
  
• added brightness to saved settings
  
• bugfix SenseInterrupt breakpoint
  
• bugfix register display in AY debug
  
• bugfix memory overflow with AY audio display
  
• bugfix SYMBiFACE Mouse plugin not initialized at startup
  
• bugfix FDC default timings when loading snapshot from another emulator
  
• bugfix Emulator Mapping in Memory Explorer with ROM extension (do not use this for edition!)

Ace-DL release  2024 Summer Fixes 17/08/2024

Breakpoints, FDC/Drive, Explorers, Joysticks

• Save/Restore more parameters with RamDump/GFX Explorer windows
• Seek polling catch-up triggers earlier than expected (wip)
• Ability to see/edit/dump ASIC page in Memory Explorer
• Display current mapping in Memory Explorer when using Emulator mapping view
• bugfix crash when USB joystick has no name
• bugfix intempestive Memory Explorer or Breakpoint window when launched from a Memory Explorer
• bugfix RAM Breakpoint mask default (was 0 instead of 0x3FFF for any bank)

Ace-DL release  2024 Wake points

• File import in RAM Explorer may use AMSDOS header when available (new option in miscellaneous)
• File import in RAM Explorer with AMSDOS header does not need the emulator to be paused
• ROM import from snapshot automapped into cartRidge or VROM when play2CPC is active
• Enabling condition editor for all breakpoints (need keyboard translation for GUI)
• Added CRTC mapping to breakpoint conditions
• Breakpoints import/export (ACE dedicated BRK files)
• Keep sound quiet when draging something into emulator when in Trace mode