25 Jul
2019
25 Jul
'19
10:09 a.m.
I'm putting together a MicroPDP-11/23 in a BA23 box.? Have the M8189 CPU
quad width board and the bulkhead cabinet kit, with two DB25 connectors
and switches to set the baud rate.? On bitsavers the 'MicroPDP11 system
technical manual' shows how to set jumpers on the M8189 to allow this
cabkit set the baud rate, but only briefly mentions the cables needed.
Does anyone here have a anatomically correct MicroPDP-11/23+ in a BA23
box and can tell me how the cabling goes from the M8189 CPU board to the
bulkhead cabinet kit?
Doug
25 Jul
25 Jul
7:11 p.m.
On Thu, Jul 25, 2019 at 10:09 AM Douglas Taylor via cctalk
<cctalk at classiccmp.org> wrote:
I'm putting together a MicroPDP-11/23 in a BA23 box. Have the M8189 CPU
quad width board and the bulkhead cabinet kit, with two DB25 connectors
and switches to set the baud rate. On bitsavers the 'MicroPDP11 system
technical manual' shows how to set jumpers on the M8189 to allow this
cabkit set the baud rate, but only briefly mentions the cables needed.
Does anyone here have a anatomically correct MicroPDP-11/23+ in a BA23
box and can tell me how the cabling goes from the M8189 CPU board to the
bulkhead cabinet kit?
I might have a console panel for an M8189 KDF11-B 11/23+. If I do, I
couldn't find it the first couple of places I looked. Or maybe I have
a console panel for an M7554 KDJ11-D 11/53, I forget which one, or
both, or neither that I have.
Anyway, back to the cable for the console panel for an M8189 KDF11-B
11/23+, isn't that just a 20 conductor ribbon cable that attaches to
the 20-pin connector on console panel, then on the M8189 end it splits
in the middle into two 10 conductor halves for the two 10-pin
connectors on the M8189?
To use the baud rate switches on the console panel the M8189 needs to
be jumpered for external baud rate generation. The console panel
contains a baud rate generator which feeds the baud clock into pin 1
of each of the two 10-pin connectors.
7:32 p.m.
On 7/25/2019 10:11 PM, Glen Slick via cctalk wrote:
On Thu, Jul 25, 2019 at 10:09 AM Douglas Taylor via
cctalk
<cctalk at classiccmp.org> wrote:
Yes, it is a 20 pin cable at the bulkhead.? I appears to be keyed so you
can't put it in wrong.? The 10 pin connectors on the CPU board don't
seem to be keyed, so my uncertainty is about how the cable wires go from
the 20 pin bulkhead to each 10 pin connector. Is there something that
gives the orientation away??? I thought maybe tracing the Rx Tx pins on
the DB25 connector to the 20 pin cable, then on to the 10 pin CPU
connector.? These probably go straight thru without any diversion.
I'm putting together a MicroPDP-11/23 in a
BA23 box. Have the M8189 CPU
quad width board and the bulkhead cabinet kit, with two DB25 connectors
and switches to set the baud rate. On bitsavers the 'MicroPDP11 system
technical manual' shows how to set jumpers on the M8189 to allow this
cabkit set the baud rate, but only briefly mentions the cables needed.
Does anyone here have a anatomically correct MicroPDP-11/23+ in a BA23
box and can tell me how the cabling goes from the M8189 CPU board to the
bulkhead cabinet kit?
I might have a console panel for an M8189 KDF11-B 11/23+. If
I do, I
couldn't find it the first couple of places I looked. Or maybe I have
a console panel for an M7554 KDJ11-D 11/53, I forget which one, or
both, or neither that I have.
Anyway, back to the cable for the console panel for an M8189 KDF11-B
11/23+, isn't that just a 20 conductor ribbon cable that attaches to
the 20-pin connector on console panel, then on the M8189 end it splits
in the middle into two 10 conductor halves for the two 10-pin
connectors on the M8189?
To use the baud rate switches on the console panel the M8189 needs to
be jumpered for external baud rate generation. The console panel
contains a baud rate generator which feeds the baud clock into pin 1
of each of the two 10-pin connectors.
7:58 p.m.
On Thu, Jul 25, 2019 at 7:32 PM Douglas Taylor via cctalk
<cctalk at classiccmp.org> wrote:
On 7/25/2019 10:11 PM, Glen Slick via cctalk wrote:
In the photos that I have found of the M8189 console panel there is a
'1' just above the top right of the 20-pin connector indicating Pin 1.
A trace can be seen leading from that pin to the baud rate circuitry.
So that pin would go to Pin 1 of one of the 10-pin connectors on the
M8189.
Then 5 pins over from the Pin 1 on the console panel another trace can
be seen leading from that other pin to the baud rate circuitry. So
that would be Pin 1 of the second half of the cable going to Pin 1 of
the other 10-pin connector on the M8189.
On Thu, Jul 25, 2019 at 10:09 AM Douglas Taylor
via cctalk
<cctalk at classiccmp.org> wrote:
Yes, it is a 20 pin cable at the bulkhead. I appears to be keyed so you
can't put it in wrong. The 10 pin connectors on the CPU board don't
seem to be keyed, so my uncertainty is about how the cable wires go from
the 20 pin bulkhead to each 10 pin connector. Is there something that
gives the orientation away? I thought maybe tracing the Rx Tx pins on
the DB25 connector to the 20 pin cable, then on to the 10 pin CPU
connector. These probably go straight thru without any diversion. I'm putting together a MicroPDP-11/23 in a
BA23 box. Have the M8189 CPU
quad width board and the bulkhead cabinet kit, with two DB25 connectors
and switches to set the baud rate. On bitsavers the 'MicroPDP11 system
technical manual' shows how to set jumpers on the M8189 to allow this
cabkit set the baud rate, but only briefly mentions the cables needed.
Does anyone here have a anatomically correct MicroPDP-11/23+ in a BA23
box and can tell me how the cabling goes from the M8189 CPU board to the
bulkhead cabinet kit?
I might have a console panel for an M8189 KDF11-B 11/23+. If
I do, I
couldn't find it the first couple of places I looked. Or maybe I have
a console panel for an M7554 KDJ11-D 11/53, I forget which one, or
both, or neither that I have.
Anyway, back to the cable for the console panel for an M8189 KDF11-B
11/23+, isn't that just a 20 conductor ribbon cable that attaches to
the 20-pin connector on console panel, then on the M8189 end it splits
in the middle into two 10 conductor halves for the two 10-pin
connectors on the M8189?
To use the baud rate switches on the console panel the M8189 needs to
be jumpered for external baud rate generation. The console panel
contains a baud rate generator which feeds the baud clock into pin 1
of each of the two 10-pin connectors.
1975
days inactive
1976
days old
3 comments
2 participants
participants (2)
-
dj.taylor4＠comcast.net -
glen.slick＠gmail.com