680x0 tester

JimDrew · 28 October 2014, 01:27

Does anyone know of a 680x0 CPU test program? I would imagine that something had to be created at some point to test the 68K CPU emulation in UAE?

Toni Wilen · 28 October 2014, 10:01

Nope. CPU emulator (or more like CPU emulator code generator) was already mostly complete when I started working with UAE.

I don't think there was big need for test programs because all UAE CPU emulators are 100% generated code, from single generator code, generator code itself is quite simple and final code is built from small blocks (calculate ea if needed, load if memory operation, do operation, generate flags, store if needed) so if something is wrong, most instructions will also break

alexh · 28 October 2014, 14:11

You could ask Neill Corlett / James Boulton / Arnaud Carre.

They wrote/improved/maintained the 68000 emulator used on the Atari ST emulator SainT.

Because the Atari ST is so sensitive to instruction timing for it's demo techniques the 680x0 core of SainT has had to be improved over the years for bit and cycle accuracy.

Or Karl Stenerud who wrote Musashi which is another 680x0 emulator.

JimDrew · 28 October 2014, 20:44

OK thanks. When I wrote the 68040 CPU emulation for FUSION (x86 assembly), I had a 68040 Amiga sitting next to the PC and I could check things as I went. Now I wish I would have kept all of those test routines. :\

28 October 2014, 01:27	#1
JimDrew Registered User Join Date: Dec 2013 Location: Lake Havasu City, AZ Posts: 741	680x0 tester Does anyone know of a 680x0 CPU test program? I would imagine that something had to be created at some point to test the 68K CPU emulation in UAE?

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28 October 2014, 10:01	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,515	Nope. CPU emulator (or more like CPU emulator code generator) was already mostly complete when I started working with UAE. I don't think there was big need for test programs because all UAE CPU emulators are 100% generated code, from single generator code, generator code itself is quite simple and final code is built from small blocks (calculate ea if needed, load if memory operation, do operation, generate flags, store if needed) so if something is wrong, most instructions will also break

28 October 2014, 14:11	#3
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,354	You could ask Neill Corlett / James Boulton / Arnaud Carre. They wrote/improved/maintained the 68000 emulator used on the Atari ST emulator SainT. Because the Atari ST is so sensitive to instruction timing for it's demo techniques the 680x0 core of SainT has had to be improved over the years for bit and cycle accuracy. Or Karl Stenerud who wrote Musashi which is another 680x0 emulator.

28 October 2014, 20:44	#4
JimDrew Registered User Join Date: Dec 2013 Location: Lake Havasu City, AZ Posts: 741	OK thanks. When I wrote the 68040 CPU emulation for FUSION (x86 assembly), I had a 68040 Amiga sitting next to the PC and I could check things as I went. Now I wish I would have kept all of those test routines. :\

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