Wednesday, Jan 14 2009:
Replacement synch generator chip arrived today from fpgaarcade.com. I plugged it in, and...RAM 1L error message
. I unplugged it after dinner to show my son, and...IT WORKED!
The vertical hold needed adjustment (it finally clicked in my brain that it is indeed the vertical hold, not horizontal hold, since the monitor is actually mounted sideways). But after a few minutes of warming up, the screen centered correctly on its own.
Naturally, I had to have a game (or 2 or 3 or 4...), so I reinstalled the unfinished coin door temporarily. The control panel felt (and looked) very good. There is a hum from the speaker that I will need to troubleshoot. Oh well...progress!