Re: Hardware emulation of 6509 using 6502?

From: smf <*smf_at_null.net*> Date: Wed, 15 Nov 2017 13:22:51 +0000 Message-ID: <f6a271be-da86-dfa0-7830-54760dc1415b@null.net> · smf_at_null.net

On 15/11/2017 13:16, smf wrote:
>
> In terms of the second source suppliers, I believe they were under 
> contractual obligation to produce exactly what MOS told them & if 
> there are variances then you'll see them in MOS chips too.
>
Not only that, commodore changed from NMOS to HMOS-I and then HMOS-II. 
So you should avoid any instruction that aren't stable on all c64's, 
plus 4's and c128's.

http://www.oxyron.de/html/opcodes02.html


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