tlgrooms wrote: ↑
Tue Aug 25, 2020 9:49 am
Dalek, what would your machine do when you had this problem? Mine just comes up with a black screen and alternates between 2 different shades of black and will go no further in the startup process.
Also, will any 74F245PC chip work? Do the other numbers on the chip need to match? Mine for instance show MP9112. Some of those offered on ebay show P9024Y.
It would do lots of weird things, not always consistent. I would get a yellow screen even with the daughterboard in place, sometimes black screen.
Usually corrupt graphics in diagrom, memory tests failing in different areas and different patterns of memory failures depending on where I placed known good ram chips. Also failures depended on temperature too, so some freeze spray might have helped me isolate the problem chips.
Any old dip 74F245 from any manufacturer will be fine. Steer clear of Chinese suppliers/ebay as they could be rebadged slower parts. Get new from digikey or mouser they are cheap enough.