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Parallel printer cable for PDP-11

Mal

Experienced Member
Joined
Apr 3, 2008
Messages
91
I have a couple of cables with identical wiring that appear to be for a parallel printer.

They have a 40-pin Berg connector on one end and a Centronics-style d-shell connector on the other end.

The Centronics end is wired for the usual signals (D0-D7, STB, Busy, Fault).

The wiring at the Berg end does not match the LS11/LP11 interface boards (M7930 or M7258 ) according to the schematics in the LP11 Engineering Drawings.

Any suggestions as to which PDP-11 (or perhaps PDP-8 ) interface board this cable might be intended for?

Malcolm
printer-cable.jpg
 

m_thompson

Veteran Member
Joined
Jul 8, 2014
Messages
1,714
Location
Rhode Island, USA
The PDP-8 LS-8E Centronics printer interface uses a cable like that.
I have the printer interface board, but do not have the cable.
 

Mal

Experienced Member
Joined
Apr 3, 2008
Messages
91
Thanks for pointing me to the LS8-E. It turns out that the LS8-E (M8342) and LS11/LP11/LA11 (M7258) are wired the same, so far as D1-D7, STB and ACK are concerned. So this cable doesn't suit the LS8-E either.

The LS8-E Engineering Drawings do show the cable wiring needed to make up a parallel printer cable. It appears the DEC P/N for the Centronics cable for the LS8-E is 7008859.

Interestingly the LS8-E is a 7-bit bidirectional interface, whereas the M7258 is 8-bit unidirectional.
 

Mal

Experienced Member
Joined
Apr 3, 2008
Messages
91
It turns out that this cable seems to have been wired to suit the DRV11, or a compatible such as the MDB MLSI-DRV-11C.

Perhaps the DRV11 was able to be configured to be software compatible with the LS11/LP11/LA11. I haven't yet had time to check that out.
 

bqt

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Joined
Sep 15, 2019
Messages
506
Location
Zurich, CH
It turns out that this cable seems to have been wired to suit the DRV11, or a compatible such as the MDB MLSI-DRV-11C.

Perhaps the DRV11 was able to be configured to be software compatible with the LS11/LP11/LA11. I haven't yet had time to check that out.

No, the DRV11 wouldn't be software compatible, as far as I know. But that would not prevent anyone from using it to communicate with a printer, with a different driver. Makes sense. If you have a DRV11, and want to hook up a printer, why not use the DRV11 instead of going out and by a LS11.
 
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