Recent content by BigDaddyCainer

Hi. I've got a C128 board with a dead ROM - it's a 23128. The 27512 is a pin compatible drop in, except for the A13 / A14 address lines. I have flashed the EEPROM with the BIN I need, but I just need to know if I need to tie these 2 address lines High or low? I flashed the EEPROM with no...

Hi. I've acquired a couple of Commodore PET 4032 units. One of them I have managed to repair and it works like a charm. (Dodgy 25v Tant cap dragging down the 12v line to the RAM). However, I have another one which had the same fault. I repaired that but I get no display. I get the garbage...

Hi All. Just wondering if you can help. I have an old PET 3008 which won't power up. The CRT comes up O.K but the screen is full of characters. I am guessing this is because the ram isn't being cleared down. I have a Hameg scope and have checked out the data and address busses - they run...