computers‎ > ‎DEC‎ > ‎MicroVAX 3500‎ > ‎

LHN

This VAX started life at the Department of Scientific and Industrial Research as "LHN" in Lower Hutt during the late 80s. It then moved to GNS Science when DSIR was split up into the Crown Research Institutes in the early 90s. It remained at GNS Science until the 20th of December 2008. It was not the original machine to be called "LHN" - it replaced a VAX-11/780 of the same name.

This was my second VAX which I got from the original owner in December 2008. It is currently setup and running OpenVMS 7.3 nicely from a SCSI disk attached to one of the ports on the UC08 SCSI controller.

Unlike the previous one, this one is in very good condition - the only problem is the handle lock on the TK70 drive appears to be broken (there was a tape stuck in the drive and it seems someone tried to remove it with force). The battery has not yet exploded and it has all of its panels covering the QBus slots. It even came with its manuals and a front cover key. The machine also came with a full set of cables - power, two SCSI cables, six cables & boxes for the CXA16 boards, two MMJ cables, a handful of MMJ plugs and four short (~30cm) cables with an MMJ plug crimped on one end which I have made into adapters.

Aside from the TK70, the machine has no internal drives - the ones that used to be attached to the KDA50 controller were long ago replaced with external SCSI ones.

Slot: Module: Option: Description:
1 M7620 KA650 KA650 CPU board
2 M7621 MS650-AA 8-MByte RAM for KA650
3 M7621 MS650-AA 8-MByte RAM for KA650
4 M7622 MS650-BA 16MByte MOS RAM for KA650
5 M7516-PA DELQA-SA Ethernet Interface
6 M3118-YA CXA16-M 16-line Asynchronous Multiplexor w/DEC423 output (for BA200 series only)
7 M3118-YA CXA16-M 16-line Asynchronous Multiplexor w/DEC423 output (for BA200 series only)
8 M3118-YA CXA16-M 16-line Asynchronous Multiplexor w/DEC423 output (for BA200 series only)
9

Emulex UC07/UC08 SCSI Controller
10AB M7559 TQK70 TMSCP controller for TK70
10CD

74-33507-01 blank plastic card (Dual height module spacer panel)
11 M7164 KDA50-Q QBus SDI Disk Adapter board 1 of 2
12 M7165 KDA50-Q QBus SDI Disk Adabter board 2 of 2

Documentation

The contents of the documentation binder I got with the machine has been scanned and is available here. I am still looking for the following documentation however:
  • EK-DELQA-IN
  • EK_CAB16-TM
  • documentation for any of the other boards
If you have digital copies of any of this or know where it can be found it would be great to hear from you. david@zx.net.nz