ZX Fail

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kbjunkie
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Re: ZX Fail

Post by kbjunkie »

IC25/26 being faulty will certainly cause you issues with upper RAM..

I would socket them both and replace them. Probably find that will sort the issue.

KbJ
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1024MAK
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Location: Looking forward to summer in Somerset, UK...

Re: ZX Fail

Post by 1024MAK »

See also this topic ;-)

Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp

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