> > Peter, > > I confirmed that there is a NCR5380 chip on the daughterboard and that > everything was connected. Still no joy. The one thing I'm wondering is > this. If you look at the attached picture below from > http://home.iae.nl/users/pb0aia/vax/vs3khw.html, you will see there is a > 40-ish pin EPROM (?) in the bottom row of chips third from the left. Mine > just has an empty socket there. Is it possible this is causing the problem?
According to the printset (which I am pretty sure I got from bitsavers), there should be a 64K*16 bit 40 pin EPROM on the disk controller daughterboard. What it contains I do not know. It does appear to be an EPROM rather than a microcontroller (which was my first thought when the idea of a 40 pin package with a quartz window was mentioned) so it should be possble to copy one from a working machine, given a suitable programmer. -tony
