8 Oct
2003
8 Oct
'03
2:52 a.m.
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.
Thanks for any help!
-- Pat
PLUG Vice President -- http://plug.purdue.org
Slackware Linux -- http://slackware.com
Purdue University Research Computing -- http://www.itap.purdue.edu/rcs
8 Oct
8 Oct
6:04 a.m.
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.
I hope I understand you here, but if you're trying to use it on a non
11/23 system you out of luck (OK, you can use it on a 11/24 too ...)
If you look carefully at this board, you see that the qbus finger are
only for the power supply of this board, there are no signals on it.
Everything else this board needs is coming from the 11/23 or 11/24 FPU
socket on the CPU module ...
cheers
6:24 a.m.
emanuel stiebler had uttereth on Wednesday 08 October 2003 01:04 pm:
Patrick Finnegan wrote:
No, I was trying to indicate that the CPU was an 11/23 not an 11/23+. So,
do I need some magic cable to go from a DIP socket on the CPU board to
this card? If so, does anyone have a pinout for it?
Thanks!
Pat
--
Purdue University ITAP/RCS
Information Technology at Purdue
Research Computing and Storage
http://www.itap.purdue.edu/rcs/
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.
I hope I understand you here, but if you're trying to use it on a non
11/23 system you out of luck (OK, you can use it on a 11/24 too ...)
If you look carefully at this board, you see that the qbus finger are
only for the power supply of this board, there are no signals on it.
Everything else this board needs is coming from the 11/23 or 11/24 FPU
socket on the CPU module ...
7:24 a.m.
Patrick Finnegan wrote:
No, I was trying to indicate that the CPU was an 11/23
not an 11/23+. So,
do I need some magic cable to go from a DIP socket on the CPU board to
this card? If so, does anyone have a pinout for it?
AFAIRC, it's just a flat ribbon cable. So it should be 1:1.
cheers
8:43 a.m.
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8:50 a.m.
At 01:24 PM 10/8/03 -0500, you wrote:
emanuel stiebler had uttereth on Wednesday 08 October
2003 01:04 pm:
If you're referring to the large socket between the MMU and FP IC, then
it's a spare according to my DEC handbook.
Joe
Patrick Finnegan wrote:
No, I was trying to indicate that the CPU was an 11/23 not an 11/23+. So,
do I need some magic cable to go from a DIP socket on the CPU board to
this card? If so, does anyone have a pinout for it? 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.
I hope I understand you here, but if you're trying to use it on a non
11/23 system you out of luck (OK, you can use it on a 11/24 too ...)
If you look carefully at this board, you see that the qbus finger are
only for the power supply of this board, there are no signals on it.
Everything else this board needs is coming from the 11/23 or 11/24 FPU
socket on the CPU module ...
Thanks!
Pat
--
Purdue University ITAP/RCS
Information Technology at Purdue
Research Computing and Storage
http://www.itap.purdue.edu/rcs/
9:12 a.m.
Patrick Finnegan wrote:
I've managed to pick up an FPF11/M8188 (PDP-11/23
Floating Point option)
for my PDP-11/23, [...] I've got a non-+ 11/23 CPU board that I'd like
to get it to work with,
"emanuel stiebler" <emu(a)ecubics.com> wrote:
I hope I understand you here, but if you're trying
to use it on a non
11/23 system you out of luck (OK, you can use it on a 11/24 too ...)
I think Patrick meant that he wants to use it on an 11/23 that is
not an 11/23+. The former uses the KDF11-A dual-height CPU (M8186),
and the latter uses the KDF11-B quad-height CPU (M8189).
I think the FPF11 should work with either, but I'm not 100% certain.
You need a cable from the 40-pin header on the FPF11 to one of the
MICROM sockets on the KDF11. I'm not sure whether it makes any
difference which MICROM socket is used.
For example, the KUV11 WCS option (M8018) for the LSI-11 (11/03, KD11-F,
M7264) needs a particular MICROM socket with an extra signal, and so it
won't work on the double-height LSI-11/2 CPU (KD11-HA, M7270) which
does not have that signal wired to a MICROM socket. I don't know whether
the FPF11 has similar considerations.
8:38 a.m.
pat,
I have the DEC Microcomputer Processor handbook (1979/1980) and it has a
complete chapter on the 11/23 CPU. There's a section in that that describes
the Floating Point Option and another sewction that describes the
configuration setting. But there's nothing in either section that indicates
that any jumpers have to be set for the FP option. There's also a chapter
on Floating Point operation but it only describes the operands and such.
There's no indication in this book that you need to do anything after
installing the FP option.
Joe
At 09:52 AM 10/8/03 -0500, you 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.
Thanks for any help!
-- Pat
PLUG Vice President -- http://plug.purdue.org
Slackware Linux -- http://slackware.com
Purdue University Research Computing -- http://www.itap.purdue.edu/rcs
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