Re: [stella] "Illegal" opcodes

[Glenn Saunders <cybpunks@xxxxxxxxxxxxx>]

At 08:38 AM 6/19/2000 +0200, you wrote:
> Which, of course, raises the question if these "illegal" instruction, when
> used in a 2600 game, will work on all 2600 variants, including clones like
> the TV boy, or not. Maybe some of them use CPU by other manufacturers, which
> do execute the official instructions correctly, but not all inofficial
> ones...

Why don't we test this out?

We should create a test program that uses most of the undocumented 
instructions, then test it on as many 2600 variants as possible.

I would expect uniformity on the regular 2600's up until the crash, but I'd 
be interested in knowing, for instance, whether a late era Atari Corp. 2600 
Jr. or a 7800 (with its underclocked 6502C) would work correctly.


Glenn Saunders - Producer - Cyberpunks Entertainment
Personal homepage: http://www.geocities.com/Hollywood/1698
Cyberpunks Entertainment: http://cyberpunks.uni.cc


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