6502 illegal opcodes

From: didier derny <didier_at_aida.org>
Date: Fri, 04 Nov 2011 17:01:43 +0100
Message-ID: <4EB40C67.7090700@aida.org>

In my cbm 8032 emulator I'm planning to have some support for illegal 

I saw 3 type of illegal opcodes

-  nop,   no visible action
-  hlt      kill the cpu
-  xxx     have an action

are they reliable from a 6502 to another  ?  (for example   mos vs 
rockwell vs synertek)
or between 6502, 6509, 6510 ?

I'm planning to support non and halt
and let the others not processed (my be in a futur version).

any idea  ?


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Received on 2011-11-04 17:00:04

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