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Yes - RAM IC in 'C' position was bad! After I replaced it, I ran Test ROM fine. Invader fleet sounds and UFO_home did not play, but other than that it was a success!!! After this I tried booting with freshly burned eeprom’s (same type I used for test rom). First few seconds screen was blank...

hi all, I have Midway SID L shape board set I got from eBay and I trying to bring it back to life. I am at the point where with test ROM I get vertical lines and ‘C’ in the middle. I found board was repaired in the past and there was a solder bridge between AD7 and +12V by one of the RAM IC’s...

hello, Just joined and wanted to say hi... I recently purchased non-working SID set (2 boards) and I am trying to fix it. So far I got it up and running, and made it to the point where I burned TEST ROM and is failing RAM test. i HAVE 5 ram ICs and when I lay IC on top of the reportedly bad IC...