Hi Julie,With the regulator track repaired, you probably will find you can adjust the pot for the voltage you need. It might be necessary to change R1 and/or the pot, but we'll burn that bridge as and when we come to it Image may be NSFW.
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I've soldered up with a wire where I'd drawn the red line, the erronous voltages were because I had the multimeter set to AC again Image may be NSFW.
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So now pin 15 is a constant 5v and pin 1 is 14.5v but it still freezes at 0000 when trying to write a eprom.UPDATE: On a whim I unplugged the cartridge from the cartridge port on the beeb and it's now programmed 3 roms (2 in fast mode and 1 in normal) without hanging. The 2 programmed in fast mode fail the verification check and the 1 in normal mode is still going. This could be from damaging the roms when I programmed them at 21v or could be something else.
It seems the pot makes little difference to the voltage I think it was 14.5v as the lowest to 14.7 at the highest.
Attached is the original rom (AMX MAX) and a failed attempt.
Statistics: Posted by vela025 — Fri Dec 20, 2024 6:39 pm
