For the upper RAM, Sinclair used faulty chips in the first place. That is why so many from the parts board tested faulty. The chips are 64K, but ZX Spectrums only use half of that for their upper RAM. If the fault is in the half they don't use then they should still work in ZX Spectrum. I believe there is a jumper on the PCB that lets you tell the board what half of the upper RAM should be used, either the lower 32K or the upper. So long as all the chips used have their fault in the same half.
@SteDubya
Жыл бұрын
That makes perfect sense. Glad I didn’t throw them. Thanks
@markretro3612
Жыл бұрын
i check the voltages before anything else as they seem a vey common failure, .. where did you get that roll of sticky pad from ??
@SteDubya
Жыл бұрын
I will definitely check voltages first going forward. I got the rubber roll from eBay. Search for “solid neoprene rubber strip self adhesive” 2mm thick and 10mm wide is a good match for the original pads. Cost about £6 for the roll.
@markretro3612
Жыл бұрын
@@SteDubya cool thankyou i will give that a go ..
@vinczejani
Жыл бұрын
you are using the ram tester the wrong way around.
@SteDubya
Жыл бұрын
How so?
@vinczejani
Жыл бұрын
@@SteDubya chip is secured when the latch is down.
@SteDubya
Жыл бұрын
🤣 ah yes I did twig to that eventually. Felt a bit silly
Пікірлер: 9