Re: Hardware emulation of 6509 using 6502?

From: groepaz_at_gmx.net
Date: Wed, 15 Nov 2017 15:33:05 +0100
Message-ID: <3730150.AGF9BRcGMA@rakete>
Am Mittwoch, 15. November 2017, 15:26:03 CET schrieben Sie:
> 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.

they were also popular for obfuscation purposes back in the days. one good 
example is arkanoid, it is using quite a bunch of them.

-- 

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Received on 2017-11-15 15:02:54

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