new part-faulty RAM chips?
Gordon JC Pearce
gordon at gjcp.net
Wed Oct 18 16:04:53 CDT 2006
Jules Richardson wrote:
> Does anyone know if the Sinclair Spectrum ever made use of RAM chips
> that were known to be part-faulty as-new? This was just asked over on
> another mailing list...
Yes. The upper 32k were supposed to be 4164s. There are sets of
jumpers on board to allow for a couple of different types of chips and
to switch which "half" is in use.
Naturally, all the chips need to be the same. I learned this the hard
way when cannibalising dead Spectrums for bits when I was a skint spotty
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