Arnold for Amiga is a port of Kevin Thacker's Arnold, the Amstrad CPC
emulator, to 68k AmigaOS 3.x with AGA. It emulates the CPC 464, 664 and
6128 as well as the CPC 6128 Plus and the GX4000 console: Plus cartridges,
disks and snapshots, with sound through Paula, on PAL and NTSC displays.
Released with Kevin's blessing, under the GPL.
Requirements
------------
- AmigaOS 3.1 or later, AGA.
- A 68040 or better: PiStorm32 (Emu68), 68060 cards, or BigMig on MiSTer.
No FPU needed.
- lowlevel.library is optional (CD32 pads).
On an A1200 with a PiStorm32 most games run at full speed with sound.
Installation
------------
Copy the Arnold drawer anywhere. Start one of the presets:
Arnold PiStorm 68040 build, sound on, frame skip up to 3
Arnold BigMig 68060 build, sound on, frame skip up to 3
or the program itself. HELP opens the menu (media, settings, controls).
README.txt in the drawer has the details, keys and Shell options.
The drawer includes the Plus system cartridge (BASIC 1.1, AMSDOS and
Burnin' Rubber) and the CPC 464/664/6128 system ROMs, so CPC disks and
the built-in game work at once. Supply
your own cartridge (.cpr) and disk (.dsk) images.
Features
--------
- CPC 464, 664, 6128, 6128 Plus and GX4000 models, picked in the menu.
- Plus / GX4000 cartridges (.cpr), standard and extended disks (.dsk) in
drives A and B, snapshots (.sna).
- PAL or NTSC (or as Workbench); on NTSC the CPC still runs at its own
50 Hz, so games and music keep their correct speed.
- Paula sound (8-bit stereo); frame skip keeps heavy games at full speed.
- Menu with pull-down options, per-game settings, keyboard map, IFF and
PNG screenshots; Workbench presets with ToolTypes.
- Joystick in port 2 (normal or CD32 pad, chosen in the menu) and the
keyboard as a joystick.
- Fixes to the Arnold core found during the port: Plus soft scroll,
raster and DMA interrupt timing, the Z80 overflow flag, disk image
loading and more (offered upstream as patches).
Known issues
------------
- Sonic GX displays correctly throughout but is not fully playable yet
on a PiStorm (it skips frames, so it jitters).
- NTSC shows fewer lines than PAL, so games drawn to the screen edges
lose their top and bottom; use PAL for the full picture.
- Pinball Dreams tears and can crash when the ball is launched.
- Disk changes are not saved back to .dsk files.
- No tape support, so the CPC 464 runs BASIC only.
History
-------
0.6 CPC 464/664/6128 and GX4000 models; Video mode (Auto/PAL/NTSC)
and Game speed in a new Settings box and Display menu; correct
50 Hz game and music speed on NTSC; menu fits 200 lines; screen
surround shows the CPC border colour; no Workbench flash.
0.5.2 Plus DMA interrupt fixes: Sonic GX's Green Hill split glitch and
its frozen special stage. The menu scrolls on NTSC displays.
0.5.1 First Aminet release.
Source and reports
------------------
Source, patches and issue tracker: https://github.com/z00p/arnold-amiga
Please report problems there with the game, your settings and your
machine.
Credits
-------
Arnold (c) Kevin Thacker, GPL-2.0. Amiga port by John Stringer, 2026.
CPCEC by CNGSoft was the accuracy reference for the Plus fixes.
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