1 Jan
2022
1 Jan
'22
3:40 p.m.
Quick question: I'm going through my old cables looking for the paddle
interface for the Current loop for my pdp8/L. I thought I saved one from
my old pdp8/I, maybe not.
Regardless, I found a M857 board with a RS232 cable on it and BC01R-25
on it. Was that for a pdp11/05 by chance?
Oddly enough I also found the interface adapter that goes into my VT52
to support 20ma current loop devices. I currently use the VT52 as an
RS232 console for my pdp11, but still, Wow.
1 Jan
1 Jan
3:52 p.m.
On Sat, Jan 1, 2022 at 6:40 PM Chris Zach via cctalk
<cctalk at classiccmp.org> wrote:
Regardless, I found a M857 board with a RS232 cable on
it and BC01R-25
on it. Was that for a pdp11/05 by chance?
I found this reference from the Cables Handbook. Sounds like it was a
generic cable that probably worked with several devices.
http://www.pdp8online.com/bklatt/43.jpg
My recollection was that the PDP-11/05 had a special 40-pin Berg
connector off the backplane for the integrated Console SLU.
-ethan
4:03 p.m.
Found here:
http://www.pdp8online.com/bklatt/43.jpg
Digital Cables Handbook
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: TILBURY2591nw.johnson at ieee.org
On 2022-01-01 18:52, Ethan Dicks via cctalk wrote:
On Sat, Jan 1, 2022 at 6:40 PM Chris Zach via cctalk
<cctalk at classiccmp.org> wrote:
Regardless, I found a M857 board with a RS232
cable on it and BC01R-25
on it. Was that for a pdp11/05 by chance?
I found this reference from the Cables
Handbook. Sounds like it was a
generic cable that probably worked with several devices.
http://www.pdp8online.com/bklatt/43.jpg
My recollection was that the PDP-11/05 had a special 40-pin Berg
connector off the backplane for the integrated Console SLU.
-ethan 
5:55 p.m.
On Sat, Jan 1, 2022, 7:03 PM Nigel Johnson Ham via cctalk <
cctalk at classiccmp.org> wrote:
Found here:
http://www.pdp8online.com/bklatt/43.jpg
https://www.vintagecomputer.net/browse_thread.cfm?id=249
Bill
2 Jan
2 Jan
8:24 a.m.
Hm. Ok, so what was it for then? Any specific pdp11, or just the serial
plug for a weird Unibus sync modem cardset?
I'm thinking of cutting it down and using it as a 20ma current loop plug
for one of my pdp8/L's. If anyone wants to trade it for a real DEC 8/I
or 8/L card or if this thing has some sort of value let me know.
C
On 1/1/2022 8:55 PM, Bill Degnan via cctalk wrote:
On Sat, Jan 1, 2022, 7:03 PM Nigel Johnson Ham via
cctalk <
cctalk at classiccmp.org> wrote:
Found here:
http://www.pdp8online.com/bklatt/43.jpg
https://www.vintagecomputer.net/browse_thread.cfm?id=249
Bill
>
>
8:35 a.m.
The original serial interface in the PDP-11 (later 11/20) was four cards
in a specially-wired backplane slot.? There was an M782(1?) interrupt
controller, a data path module whose number I forget, and the interface.
That card brought out the cable to the outside world. IOW they were
combining existing modules to get the serial function, and adding the
interface card to connect to the outside world.
The later DL11 of course did it all on one module which fitted into an
SPC slot and had a 40-pin Berg connector on the side facing the Unibus
slots for the cable take-off.
It's been along time since I took the factory training course on the
PDP11/20, and I believe the ones I worked on in the lab at Maynard that
already had a DL11 in them.
cheers,
Nigel
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: TILBURY2591nw.johnson at ieee.org
On 2022-01-02 11:24, Chris Zach via cctalk wrote:
Hm. Ok, so what was it for then? Any specific pdp11,
or just the
serial plug for a weird Unibus sync modem cardset?
I'm thinking of cutting it down and using it as a 20ma current loop
plug for one of my pdp8/L's. If anyone wants to trade it for a real
DEC 8/I or 8/L card or if this thing has some sort of value let me know.
C
On 1/1/2022 8:55 PM, Bill Degnan via cctalk wrote:
> On Sat, Jan 1, 2022, 7:03 PM Nigel Johnson Ham via cctalk <
> cctalk at classiccmp.org> wrote:
>
>> Found here:
>>
>> http://www.pdp8online.com/bklatt/43.jpg
>
>
> https://www.vintagecomputer.net/browse_thread.cfm?id=249
>
> Bill
>
>>
>>
4:24 p.m.
Oh ok, you answered it. It's from an 11/20. Weird since I never had one,
Alan Frisbee, didn't you have an 11/20 next to your CR11 reader when I
was over at your place 30 years ago?
Still the question: Anyone need it and willing to trade it for an 8/L
serial cable and card?
On 1/2/2022 11:35 AM, Nigel Johnson Ham via cctalk wrote:
The original serial interface in the PDP-11 (later
11/20) was four cards
in a specially-wired backplane slot.? There was an M782(1?) interrupt
controller, a data path module whose number I forget, and the interface.
That card brought out the cable to the outside world. IOW they were
combining existing modules to get the serial function, and adding the
interface card to connect to the outside world.
The later DL11 of course did it all on one module which fitted into an
SPC slot and had a 40-pin Berg connector on the side facing the Unibus
slots for the cable take-off.
It's been along time since I took the factory training course on the
PDP11/20, and I believe the ones I worked on in the lab at Maynard that
already had a DL11 in them.
cheers,
Nigel
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype:? TILBURY2591nw.johnson at ieee.org
On 2022-01-02 11:24, Chris Zach via cctalk wrote:
> Hm. Ok, so what was it for then? Any specific pdp11, or just the
> serial plug for a weird Unibus sync modem cardset?
>
> I'm thinking of cutting it down and using it as a 20ma current loop
> plug for one of my pdp8/L's. If anyone wants to trade it for a real
> DEC 8/I or 8/L card or if this thing has some sort of value let me know.
>
> C
>
>
> On 1/1/2022 8:55 PM, Bill Degnan via cctalk wrote:
>> On Sat, Jan 1, 2022, 7:03 PM Nigel Johnson Ham via cctalk <
>> cctalk at classiccmp.org> wrote:
>>
>>> Found here:
>>>
>>> http://www.pdp8online.com/bklatt/43.jpg
>>
>>
>> https://www.vintagecomputer.net/browse_thread.cfm?id=249
>>
>> Bill
>>
>>>
>>>
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