I came across a hardcopy manual for MDB’s MLSI-CR11, which is a QBUS Card Reader Controller. It appears to be similar in function to the DEC CR11 UNIBUS controllers (M8290/M8291) except that it has a 50-pin I/O header instead of 40 pins. Freshly scanned manual can be found here -> http://avitech.com.au/?p..
Category : PDP-11
This is a PDP-11/73 in a Webster Spectrum enclosure. The 11/73 board (M8192) appears to be the only genuine DEC board in the backplane. The Spectrum is mounted in a half-height rack that also houses a Cipher tape drive. The Cipher tape drive is a Model F880640-90-1025U, with Option E and 1600 BPI (according to ..
The 871B Power Controller is a single-phase 240VAC power controller found in some PDP-11 systems. It has 6 switched power sockets. One of my holiday projects was to replace the faulty neon indicator in this Power Controller. I have just posted a short webpage with some information about this repair, and some reference information about ..