Hello. Apologies for any noob mistakes, but I am looking for help. I have a Macintosh Plus Replica PCB I sourced from eBay. A battery bombed sonar Macintosh Plus board, and a Raspberry Pi Pico Breakout board to supply power and VGA out. I have a 3.5 external drive, and a BMOW Floppy Emu.
When the board boots there is a sort of bong, a black screen surround ”disky” (disk and ?), if I put a bootable disk in I get a happy Mac, still with a surround d black screen. The drive or floppy emu search for a few seconds then stops.
I saw Adrian Black’s video suggesting stuck on an alternate screen, and was a RAM issue. I have tried various other SIMMs and still the same black surround. I have tried R8 populated and 4x256kb, currently I have R8 populated and 2 x 1mb SIMMs and still the same.
everything is socketed - see the board.
Any ideas?
When the board boots there is a sort of bong, a black screen surround ”disky” (disk and ?), if I put a bootable disk in I get a happy Mac, still with a surround d black screen. The drive or floppy emu search for a few seconds then stops.
I saw Adrian Black’s video suggesting stuck on an alternate screen, and was a RAM issue. I have tried various other SIMMs and still the same black surround. I have tried R8 populated and 4x256kb, currently I have R8 populated and 2 x 1mb SIMMs and still the same.
everything is socketed - see the board.
Any ideas?
