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 6128 Plus and
the GX4000 console: Plus cartridges, disks and snapshots, with sound
through Paula. 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), so CPC disks and the built-in game work at once. Supply
your own cartridge (.cpr) and disk (.dsk) images.
Features
--------
- CPC 6128 Plus / GX4000 cartridges (.cpr), standard and extended disks
(.dsk) in drives A and B, snapshots (.sna).
- 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 is not fully playable yet on a PiStorm (it skips frames), and
one vertical scroll in Green Hill shows a split-screen glitch.
- Pinball Dreams tears and can crash when the ball is launched.
- Disk changes are not saved back to .dsk files.
- CPC Plus / GX4000 only so far (no plain CPC 464/664/6128).
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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