D.G. Nova update... disk drive again

[Tom Jennings]

Well all seemed fine, I was working on Kermit, making good
progress, then I/O PARITY ERROR AT xxxx -- disk read error.  Diags
etc, another shows up. Then another, but a previous goes away...

Clearly there is a soft(ish) read error. Probably all those cheap
ceramic disks on the read/write/amp board. So I will order nice,
new, correct monolithic caps, and replace all the replacements.
It's almost certainly in the analog read/write section, and not
hard logic, said hypothesis boosted by the fact of my fiddling in
that arena.

I ran memory diags and all that stuff, but I am assuming it's the
electronics I fiddled. I'll go do the job Right.