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Thread: Parallel printer cable for PDP-11

  1. #1

    Default Parallel printer cable for PDP-11

    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

  2. #2
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    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.
    Member of the Rhode Island Computer Museum
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  3. #3

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    Thanks for pointing me to the LS8-E. It turns out that the LS8-E (M8342) and LS11/LP11/LA11 (M725 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.

  4. #4

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    I think the LS8-E was made for the LA30. It is 7 bit and bidirectional.

  5. #5

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    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.

  6. #6

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    Quote Originally Posted by Mal View Post
    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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