Re: R6502AP

From: silverdr_at_wfmh.org.pl Date: Sun, 30 Nov 2014 01:58:20 +0100 Message-ID: <547A6BAC.6080805@wfmh.org.pl>

On 2014-11-30 00:50, Segher Boessenkool wrote:

>> They had packed the 6502 mask pretty carefully, so I think there wasn’t room to do much rework.
> 
> The pads (and surrounding layout) are different.  There is also the curious
> case of the extra contact in the DBE line (that we discussed on 6502hackers
> some years ago) (it doesn't change functionality, but it does perhaps change
> timing).
> 
> I haven't found any other differences.

The testsuite I ran on both chips in a 1541 shows one of the tests
failing consistently on the Rockwell but not on the MOS. Both are 2MHz
(AP vs. AD) clocked at 1 so no border case there. I'll still try to put
a few different Rockwells and see what they show but unless it's a true
accident - I expect all of them to show the same.

-- 
SD!

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