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

From: Segher Boessenkool <>
Date: Sun, 11 Dec 2011 03:33:08 +0100
Message-Id: <>
>> 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.

> 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.

>>> To bad no one has yet been able to find a software trick to
>>> distinguish between the 6510 and the 8500. :)
>> They didn't? I thought you could do the timing thing with the high
>> port pins? Very unstable of course...
> Yes, there seems to be some kind of overlap so that there is no way  
> to be 100% sure whether you have a 6510 or a 8500. All you seem to  
> be able to do is get an approximation of the die temperature if you  
> take a measurement at power on and re-measure later.

Yeah.  Statistical stuff :-)  Maybe you get better results if you
combine this with a test of the XAA instruction?


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