MAMEWorld Forums - Programming - Re: Some changes I want to submit

> 1) 6502 disassembly: op6502 in 6502dasm.c contains a lot of opcodes not supported by
> a 6502 CPU. Does it make sense to submit a "fixed" op6502 or is someone using it in
> current form? If so, I could add a basic_op6502 and switch between the current form
> and the basic form with a menu choice like "Basic Opcodes".

I believe that function is also used by other 6502 family members (especially in MESS), so removing the extra opcodes is a non-starter.

> Also, the string for illegal opcodes "ill" is hard for me to pick out in disassembly.
> I want to change it to "???" Is this submittable or just a style preference I need to
> compile in my version of MAME? Or a configuration that can be set somewhere?

There's no specific rule on illegal opcodes in disassembly, although most CPU cores output "ill" or "illegal" so I guess that's a pseudo-standard.

> 2) If I find a bug, do I need to submit a bug and then a fix? Or is it easier for
> everyone involved if I just submit a code change with the fix?

It's extremely unlikely there are any bugs in the M6502 - it runs probably tens of thousands of ROMs correctly across various MAME and MESS systems. That said, if one comes up and you can prove it (ideally vs. real hardware) submit the actual fix.

> 3) Is someone "directing" or in charge of architecture of the MAME debugger? I have a
> change I want to make but would prefer to discuss it with someone.

The debugger is Aaron's baby.