PDP-12 Restoration at the RICM

We are now working on the RK8F controller and RK05 drive. The RK8F has special M7104 and M7105 boards so it will work in the DW8E Omnibus-Posibus chassis. The MAINDEC-08-DHRKA RK8E Diskless Control Test showed that a data-break to address 0000 worked, but did not work to address 7777. After about 4 hours of debugging we found a dirty connection on an M7102 board in the DW8E chassis. This prevented one of the CA signals from the RK8F from being driven onto the Posibus MA. The DHRKA diag now passes, so much of the RK8K and the DW8E are working. We bought a new NiCd battery pack for the RK05 and new weather strip to replace the blower to card cage, and plenum to disk pack seals. There is also a power supply problem that shows up after the RK05 had been powered on for 10 minutes that we need to fix. We have a disk pack that came with the PDP-12, but we don't know if it has LAPS-DIAL or OS/12 installed. Maybe we will solve that mystery in a few weeks. -- Michael Thompson