new part-faulty RAM chips?

Gordon JC Pearce gordon at
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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