Subject: Corrections to VAX FAQ
To: None <port-vax@NetBSD.ORG>
From: Bruce Lane <kyrrin@wizards.net>
List: port-vax
Date: 05/25/1997 20:37:09
Just a heads-up to those who may have tried to make their own VAXStation
II/GPX video/keyboard/mouse cable (the BC18 series), based on the
information at:
http://www.bitcon.no/~gunnar/vaxbsd/section6.html#ss63
...as written by Dave Clark (yes, I CC'd him on this).
There are a couple of typos in the pinout cross-reference, as shown in the
FAQ, which caused me to have to re-pin both ends of my cable (and might,
under different conditions, have blown something out -- thank God that
didn't happen!) The pertinent corrections are shown below.
DB15: KB RJ11: Mouse: Function:
15 1 KB Transmit
6 2 KB Receive (Was shown as 7 on the DB15 side)
14 3 KB Ground
8 4 KB Power
5 2 Mouse TX
13 3 Mouse RX
7 1 Mouse Ground (Was shown as 6 on the DB15 side)
4 5 Mouse +5 VDC
12 4 Mouse -20 VDC
9 Red Video Hi
1 Red Return
10 Green/Sync Hi
2 Green/Sync Return
11 Blue Video Hi (Was shown as 1 on the DB15 side)
3 Blue Return
In summary, the corrections I found necessary were: Pins 6 & 7 were
transposed on the DB15 side, and pin 11 (Blue video high) was incorrectly
labeled as pin 1.
I have assembled a 'cheater' cable for my VAXStation II since, for some
reason, my BC18 cable did not have a mouse connection, and have pinned it
to bring out the mouse connections on a separate cable leading to a 7-pin
Mini-DIN connector. So far, I've seen no indication that this does not work
(meaning that the mouse or support circuitry has not gone up in smoke yet),
but I have yet to install windowing software to test the mouse. I will post
the results here as soon as I do so.
Caveat emptor!
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Sysop, The Dragon's Cave BBS (Fidonet 1:343/272)
(Hamateur: WD6EOS) (E-mail: kyrrin@wizards.net)
http://www.wizards.net/technoid
"Our science can only describe an object, event, or living thing in our own
human terms. It cannot, in any way, define any of them..."