The LOCI-2A has a failure when powered on and the NIXI tubes don't light up. We put the original 1401A NIXI board back in the machine, and all of the...
I used a 4164-15 which works fine. Interestingly it was the first chip in bank 0 that was dead and that killed the whole board. Also not having a RAM...
I have a Plessey Q-Bus disk controller that emulates a RLV12. When I compare it with the manual for the Sigma SDC-RLV12 it seems they are identical....
Yes, if its is rolling vertically on both monitors, and won't come into vertical lock, it suggests something has happened to the vertical sync pulse...