Re: Hardware emulation of 6509 using 6502?

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Wed, 15 Nov 2017 15:26:03 +0100 Message-ID: <08901b80-b855-5221-0285-b9e27b1a71f9@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 11/15/2017 03:11 PM, didier derny wrote:
> I find all that strange  for me using "side effect" of a chip such as 
> illegal opcode is a bad practice... and makes bad software...
> 
> in Commodore software is there any use of these illegal opcode ?

No... But some floppy speeders and demos, maybe also some games use them 
  since you can save some clock cycles that way.

So, it depends on what you want to do with your system. For 100% 
compatibility, you need the illegal opcodes.

  Gerrit

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