11/53 - Qbus backplane question

From: Gooijen H <GOOI_at_oce.nl>
Date: Fri Jan 4 02:41:47 2002

I got in the 11/53 running Micro/RSX.

The 11/53 has an H9278-A backplane. According to
Megan's fieldguide the first 3 slots are Q22/CD
and the last 5 slots are Q22.
What does that mean?

At this moment, this is the configuration:
slot 1 rows 1-4: M7554-02 - 11/53-PLUS CPU
slot 2 rows 1-2: M3106 - 4-line async EIA MUX
slot 3 rows 1-2: M7546 - controller for TK50
slot 4 rows 1-2: M7555 - RQDX3
       rows 3-4: ???
All other slots and not mentioned row positions are empty.

In slot 4 rows 3-4 is a card with just one 8-pos DIP switch
three 16-pin DIL resistor chips and some decoupling caps.
At the top are two BERG connectors, one 40 pin and one 50 pin.
These two flatcables connected to an external unit, brandname
Dynafive. Inside that box are several "Dynafive" boards and
one board of "VGScientific". The rear of the box has several
BNC connectors with markings that pops 'video' stuff to mind.
Like H-sync, Green-in, Red-in, Green-out, etc.
This box and the 11/53 were connected to eachother. On the
disk in the 11/53 I found .RNO files that describe the VGS5000
and how to use the application (something with spectral analysis).
So far for the system description.
Now my question.
1) Can I remove that ??? card
2) Put a DELQA or DECNA at the same position?

I seem to remember that the RQDX3 must be the last device in
the backplane for some reason.
So, should the Ethernet card go in slot 4 rows 1-2 and should I
move the RQDX3 to slot 4 rows 3-4?

TIA,

- Henk
Received on Fri Jan 04 2002 - 02:41:47 GMT