On Oct 8, 9:52, Patrick Finnegan wrote:
> I've managed to pick up an FPF11/M8188 (PDP-11/23 Floating Point
option)
> for my PDP-11/23, and I'm wondering if anyone here knows how to set
up/
> configure this thing. It's a standard-looking dual-height QBUS
module,
> with a 2x20 pin header at the top of the card (with the QBUS fingers
> pointing downward. I've got a non-+ 11/23 CPU board that I'd like to
get
> it to work with, currently stuck in a BA23 cabinet.
You mean a dual-height KDF11-A ? I'm not sure if it'll work with that;
it's designed to work with a quad-height KDF11-B or an 11/24.
The same FPF11 works in 11/23 Qbus and 11/24 Unibus systems, and MINC
systems. You ought to have a 40-way ribbon cable with a 40-way (2x20)
female header on one end and a 40-pin DIL header (to fit into a normal
40-pin DIL IC socket) on the other. If it didn't come with that, you
only have half the system and you should claim a 50% rebate from
whoever sold it to you. Failing that, it's in a dangerously incomplete
state, and you should probably send it to me for safe disposal...
QBus fitting:
The 40-pin DIL header goes into slot 2 on the KDF11-B -- that's the
40-pin socket next to the CPU chip, nearest the centre of the board --
with the red stripe (which marks pin 1) on the side of the cable
furthest from the edge connector fingers, and the cable exiting from
the plug/socket towards the centre of the PCB. Fold the cable back
over the DIL plug and the CPU chip, then fold at right angles so the
cable comes off towards the back of the KDF11-B board with the red
stripe on the left (as you look into the backplane from the back of the
machine with Slot 1 at the top).
The 40-pin female header fits onto J1 of the FPF11 with the red stripe
on the left, and the FPF11 fits into Slot 2 of the backplane.
Ditto for a MINC.
Unibus fitting:
The 40-pin DIL header goes into slot 7 (may also be marked E4) on the
KDF11-B -- that's the 40-pin socket nearest the Row A side of the board
-- with the red stripe (which marks pin 1) on the side of the cable
nearest the Row F fingers, and the cable exiting from the plug/socket
towards the edge connector fingers. Fold the cable back over itself
and pass it over the back of the CPU card. Then give it a half-twist
so the red stripe is now nearest Row A, fit it to J1 on the FPF11 and
fit the FPF11 in Rows A...D of the first slot *after* the memory cards.
The order of cards on the bus should be:
------------- 11/24 CPU -----------
------ Unibus Map (or memory) -----
--------------- memory ------------
--------------- memory ------------
--------------- memory ------------
--------------- memory ------------
---------- FPF11 ------ (empty)
terminator
or jumper
Jumpers:
There are 12 jumpers labelled W1...W12. W6 and W9 are always fitted.
W1,W2 are near the edge fingers for Row A. W3 is near the fingers for
Row B. W4,W5 are near the fingers for Row C. W6 is near the back of
the board between Rows C and D. W7,W8,W11,W12 are near the fingers for
Row D. W9,W10 are near the back of the board opposite Row D.
Jumper: W1 W2 W3 W4 W5 W6 W7 W8 W9 W10 W11 W12
Unibus: R R I R R I I I I R I I
QBus: I I R I I I R R I I R R
(I = inserted R = removed)
--
Pete Peter Turnbull
Network Manager
University of York
Received on Wed Oct 08 2003 - 15:22:46 BST