Re: Disabling memory refresh in UltiMax mode Re: 6510 handling of $00 and $01 registers

From: Gerrit Heitsch <>
Date: Sun, 11 Dec 2011 09:27:58 +0100
Message-ID: <>
On 12/11/2011 03:33 AM, Segher Boessenkool wrote:
>>> You could just switch the monitor to greyscale :-P
>> That takes out the color effects that are part of the demo.
> I thought your goal was to identify a 6569R1 this way.

Well, that you can do  if you want. But since it can also be done by 
software, there is no reason anymore.

>> Back then the CIAs were also labled 6526R4. MOS dropped the 'R4'
>> later. Gives you an idea how long it took to get those working. :)
> Not terribly long IMO. They shipped earlier revisions than that.

Those must have had some kind of bug though, or why would MOS start a 
new revision? The oldest CIA I have so far is a 6526R4 with a 2383 datecode.


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Received on 2011-12-11 09:00:03

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