On 06/05/2016 09:54 AM, Michael Thompson wrote:
We fixed the RK05 disk this week. We replaced E3 (LM301A) and E1 (SN7404)
on the G938 Servo Preamp module. The COUNT PULSE FWD H and the COUNT PULSE
REV H signals from the G938 module are both working now. The drive will now
seek correctly using the jumpers described in the Maintenance Manual or
using seek-only instructions from the RK8-F controller.
We tried the OS/8 and LAPS-DIAL bootstraps, but the processor just halted.
The first page of core that was read from the pack contained a repeating
sequence of 2525-5252. Either the pack was used as a data-only pack, or
diagnostics were run on the pack.
2525 and 5252 sound VERY much like test patterns.
Jon
