Hi all,
I've been window-shopping here for a while and read a lot of threads, but now that I'm registered I can finally pose my questions.
So far, the 512 ED that I found recently stops booting with 01743F sad mac code, with underline pixels cycling below the characters "74". The Apple information asserts that 01 prefix indicates ROM read failure, and that any following digits are "insignificant". Since those digits appear with complete consistency, they cannot be random and therefore must indicate something. Supposedly, 01 prefix is not a RAM error.
The other thing I have noticed is that any thread I have found asking about sad mac 01..., on this or any other forum, seems to get 0 replies or a redundant quote from the Apple user guide.
I'm planning to replace electrolytic caps on the logic board. The values are not listed in the CAPS! threads here. In the past I replaced a lot of failed or exploded axial tantalums on S-100 boards from the 80s, so I may do the same for the axial tants on the 512ked.
Should I also be looking at the analog board? The display and PSU appear to be functioning normally.
Any pointers or advice appreciated, thanks.
Rick
I've been window-shopping here for a while and read a lot of threads, but now that I'm registered I can finally pose my questions.
So far, the 512 ED that I found recently stops booting with 01743F sad mac code, with underline pixels cycling below the characters "74". The Apple information asserts that 01 prefix indicates ROM read failure, and that any following digits are "insignificant". Since those digits appear with complete consistency, they cannot be random and therefore must indicate something. Supposedly, 01 prefix is not a RAM error.
The other thing I have noticed is that any thread I have found asking about sad mac 01..., on this or any other forum, seems to get 0 replies or a redundant quote from the Apple user guide.
I'm planning to replace electrolytic caps on the logic board. The values are not listed in the CAPS! threads here. In the past I replaced a lot of failed or exploded axial tantalums on S-100 boards from the 80s, so I may do the same for the axial tants on the 512ked.
Should I also be looking at the analog board? The display and PSU appear to be functioning normally.
Any pointers or advice appreciated, thanks.
Rick