I'm hoping someone on here might be able to give me some guidance. I acquired this keyboard in non-working condition. It only shows blocks on the display. The first thing I had to do was replace the eproms because it only had one out of two eproms populated. I burnt the Pro76 eproms and added the three sound roms it was missing. I went through all the checks on k1000.net a few times. The power supply is giving proper voltages with no ripple. I started probing everything. I see tons of activity around the 68000 and anything associated with it. Lots of pulsing for the address and data busses, etc I see virtually no activity around the arnold chips and everything that comes after the arnold. I'm not the greatest with digital stuff so I'm at a bit of a loss. Is it likely that both my arnold chips are dead or that some input is wrong and that is preventing them from operating? Any advice would be appreciated.
