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 : DEC
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 ..
I’ve started sorting through my collection of DEC PRO-350 and PRO-380 equipment. As part of this exercise, I will be imaging any original DEC floppy disks that I locate. I have today imaged a set of 8 disks which appear to be the installation disks for V1.5 of P/OS. I have not yet checked these ..
Going through some boxes of documentation, I found some rather obscure DEC “Field Service Tech Tips” (and DEC uNote #043) that relate to the RQDX controllers. uNote #043 is already online elsewhere, but I had not seen these Tech Tips before. The 4 documents that I have scanned are: DEC uNote #043 (RQDX Controller Status/Information) ..
This post has been converted to a webpage. It is available here -> http://avitech.com.au/?page_id=1964 Apologies for the inco..
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 ..
I’ve just put up a webpage with some reference information about various RS232 connectors, including the DEC423 MMJ connectors. If interested, please take a look here -> http://avitech.com.au/?pa..
I have some original VMS CDROMs. I was looking for a way to image these (for use with SIMH) and also a way to write ISO images back to blank CDs, to use on real hardware. This should be a fairly simple process using a modern Linux computer and the “dd” command, except for one ..
I have a few VAX/VMS DECnet machines with node addresses in Area 4. Their full DECnet node addresses are 4.200, 4.202, etc. When I connect a DECnet machine in Area 33 (full address 33.13) to the same Ethernet segment, each of the Area 4 machines can see each other over DECnet, but the 33.13 machine ..