elson at pico-systems.com
Fri Aug 28 11:34:05 CDT 2015
While rummaging through recovered backups from my MicroVAX I
found a few items that might be of interest to the group.
I got an MDB mag tape interface (quite possibly the ONLY
Pertec Unformatted controller ever made for Q-bus) that
follows the MT-11 register format. There was no driver for
this. I got a homebrew MT-11 driver for Unibus machines
from somebody at work, and hacked it up to assemble for VMS
4.7 and adjust to the quirks of the MDB board (which were
I also have a driver for my Jupiter 7 for the MicroVAX.
Thus used a DRV11-WA DMA interface with some wire-wrapped
glue logic to adapt to the Jupiter's 50-pin interface bus.
It is based on the stock DRV11-WA driver, with some
additional logic to handle the handshakes between Jupiter
and the DRV11. Additionally, I built a graphics library
based on the NASA min-Vicar image processing suite, which
was a hideous hack job that ran on the PDP-11. That used
pre-assigned, numbered files. I generalized it to use
normal VMS files of arbitrary size, but otherwise kept most
of the original functions. I used the VMS table driven
parser, tparse, to parse most of the commands.
I also knew a fair bit about Versatec printers back then, if
anybody ever wants to get one of those hideous machines running.
If anybody is interested in these drivers, etc. let me know.
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