UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Sharp MZ-80K help needed on repair

SiriusHardware · 20th Sep 2021, 9:54 pm

I believe (but maybe pud can confirm again) that the original SHARP branded RAMs always test OK and that's in spite of being handled just as the other non-Sharp parts are.

Pudwink, do either of your programmers also have a chip test \ RAM test mode? Alternatively, do you have another computer, like a Spectrum, which you could test the non-Sharp RAMs in? Also did you try what I suggested, cleaning up the edges of the pins on one RAM device which always fails and then trying it again?

20th Sep 2021, 9:54 pm	#90
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,556	Re: Sharp MZ-80K help needed on repair I believe (but maybe pud can confirm again) that the original SHARP branded RAMs always test OK and that's in spite of being handled just as the other non-Sharp parts are. Pudwink, do either of your programmers also have a chip test \ RAM test mode? Alternatively, do you have another computer, like a Spectrum, which you could test the non-Sharp RAMs in? Also did you try what I suggested, cleaning up the edges of the pins on one RAM device which always fails and then trying it again?