Re: R6502AP

From: Gerrit Heitsch <>
Date: Thu, 27 Nov 2014 09:11:27 +0100
Message-ID: <>
On 11/27/2014 02:32 AM, wrote:
> On 2014-11-27 01:37, wrote:
>>> Do you mean this one:
>>> which was also announced here, back in 2008? The website no longer
>>> resolves and the file on csdb doesn't work either. Do you have it
>>> somewhere?
>> yes that one... its also in the vice test repository:
> Got them. Judging by the names of the tests in both disk images one
> command is tested per file and that includes some undocumented too. At
> least the "stable" ones as you mentioned. Shall grab a 1541 and take it
> for a spin tomorrow. Thanks, gpz.

Just for your information...

Commodore used the R6502AP in some 1541 right from the factory (probably 
were short on MOS 6502). I have one of those.

So I would assume that if there were some differences that can be found 
by software, it would be widely known since the 80s.

So far my impression was that all NMOS-6502 behave the same, including 
the ones from UMC (I have a 1581 with a UM6502A somewhere). The 
differences started with the CMOS variants.


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Received on 2014-11-27 09:00:03

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