Update on this board:
I decided to re-recap everything, as I wanted to make certain that there were not any shorts between the capacitors and traces nearby. I removed all of my capacitors, applied solder-mask to the many exposed traces I found, and put the capacitors back. I also removed a few crusty looking ICs, cleaned up underneath them, and soldered them back down. The board certainly looks neater, but remains very broken.
Interestingly, it now alternates between displaying the same screen as pictured above, and a blank gray screen. The gray screen shows no cursor or floppy, but at least it is something different. My understanding is that it means the bus is still messed up, because the ROM is not loading anything else in. I also tried some different RAM and ROM SIMMs, but they didn't make any difference.
I decided to re-recap everything, as I wanted to make certain that there were not any shorts between the capacitors and traces nearby. I removed all of my capacitors, applied solder-mask to the many exposed traces I found, and put the capacitors back. I also removed a few crusty looking ICs, cleaned up underneath them, and soldered them back down. The board certainly looks neater, but remains very broken.
Interestingly, it now alternates between displaying the same screen as pictured above, and a blank gray screen. The gray screen shows no cursor or floppy, but at least it is something different. My understanding is that it means the bus is still messed up, because the ROM is not loading anything else in. I also tried some different RAM and ROM SIMMs, but they didn't make any difference.
