Search results

BTW, I've attached the two binary ROM files for the Color Classic.

I wrote an Xcode Swift program that takes the ROM file, ECD99DC0 - Color Classic.ROM from Macintosh Repository, and splits it into the two binary files needed to program the EEPROMs needed to replace the masked ROMs on my CC motherboard. Actually, I only have to replace the Hi ROM chip, the Lo...

As I suspected, one of my masked ROMs is bad. I purchased a XGecu T48 programmer (Amazon) and a 27C400 adapter (eBay) in order to read the contents of the ROM chips. The HI ROM couldn't pass the pin check. The LO ROM was readable. Interestingly, the adapter PCB was not completely compatible...

I think the problem with my Color Classic is the logic board, not the analog board. The gray screen with horizontal retrace lines is normal when no video is sent from the logic board. Blanking of the retrace lines is contained in the video data as far as I have been able to determine. In any...

Yes, I found the pot, but adjusting it doesn't eliminate the retrace lines unless the screen brightness is reduced to black. It looks like the blanking pulses are missing from the video signal. Would that behavior stem from the video IC on the analog board?

Hello, I'm new here and new to vintage Mac restoration. I bought a Color Classic on Craigslist for $200 that I'd like to get working again. It wouldn't boot, and the display shows retrace lines on an otherwise bright blue screen (see photo). After a good cleaning I found that both the logic...