[vvuk]

A full `irsaudit` (with -continue) found no other errors; everything else is working fine, so it's definitely the DG. (I reseated the KTOWN etc just in case; unnecessarily.)

So given that:

- the failures all manifest as reading 0's for the top 16 bits in VOC registers
- all the registers look like they're related to configuring the output video (VOC = video out config?)
- the failures are identical for both VOC1 and 2 (2-monitor DG)

I'm going to guess that the problem is _not_ in anything that's actually duplicated, but either in bare connections, or some solder issues on some chip. Top 16 bits is suspicious, but I can't imagine it would be 16 pins of some chip that happened to break off exactly :p Then again who knows, it could be something exactly like that.

I guess once I get the replacement DG and get everything working, I'll take the TVO option board off this one and give the underlying DG a good close look.