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

From: crock_at_clarke-family.org.uk Date: Mon, 12 Dec 2011 18:16:36 +0100 Message-ID: <55516e79de0a8e7672ea160b1de4dc14.squirrel@www.clarke-family.org.uk>

> So far the only defective RAM I had in these old systems was either
> stuck bits (very often the MT4264) or a complete core meltdown (system
> doesn't start up at all, defective chip gets very hot very fast)
>
> So it's better than nothing. Always open for suggestions for a better
> test program though.
>
>   Gerrit
>

The only useful programmes for finding ram issues are HW based. The ones I
used were Commodore's own dead test cartridge or a Jupiter Lander
cartridge, as the effects of defective DRAM's on the graphics in the game
were well documented.

rob

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