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  • Looking at a PDP-11 Circuit Board

    From cli...@gmail.com@cliff52@gmail.com to alt.sys.pdp11 on Thu Aug 18 04:57:06 2022
    From Newsgroup: alt.sys.pdp11

    Looking at third-party PDP-11 circuit boards for sale on that auction site.
    Is there a way to tell just from pictures if the board is QBUS or UNIBUS?
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  • From Johnny Billquist@bqt@softjar.se to alt.sys.pdp11 on Thu Aug 18 21:24:13 2022
    From Newsgroup: alt.sys.pdp11

    On 2022-08-18 13:57, cli...@gmail.com wrote:
    Looking at third-party PDP-11 circuit boards for sale on that auction site. Is there a way to tell just from pictures if the board is QBUS or UNIBUS?

    It's tricky. I usually search for some identification printed on the
    screen layer, or solder layer, that gives me some hints on names to
    lookup which could tell what kind of systems used the board.

    Just trying to look at traces or components is hard.

    Johnny
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  • From P.Lj@peter.ljungberg.sui@gmail.com to alt.sys.pdp11 on Fri Aug 19 03:00:57 2022
    From Newsgroup: alt.sys.pdp11

    On Thursday, August 18, 2022 at 1:57:07 PM UTC+2, cli...@gmail.com wrote:
    Looking at third-party PDP-11 circuit boards for sale on that auction site. Is there a way to tell just from pictures if the board is QBUS or UNIBUS?

    Are you looking for something specific?

    ^P
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  • From cli...@gmail.com@cliff52@gmail.com to alt.sys.pdp11 on Sat Aug 20 04:43:03 2022
    From Newsgroup: alt.sys.pdp11

    On Friday, August 19, 2022 at 6:00:58 AM UTC-4, P.Lj wrote:
    On Thursday, August 18, 2022 at 1:57:07 PM UTC+2, cli...@gmail.com wrote:
    Looking at third-party PDP-11 circuit boards for sale on that auction site.
    Is there a way to tell just from pictures if the board is QBUS or UNIBUS?
    Are you looking for something specific?

    ^P
    --- Synchronet 3.21d-Linux NewsLink 1.2
  • From cli...@gmail.com@cliff52@gmail.com to alt.sys.pdp11 on Sat Aug 20 04:44:43 2022
    From Newsgroup: alt.sys.pdp11

    On Friday, August 19, 2022 at 6:00:58 AM UTC-4, P.Lj wrote:
    On Thursday, August 18, 2022 at 1:57:07 PM UTC+2, cli...@gmail.com wrote:
    Looking at third-party PDP-11 circuit boards for sale on that auction site.
    Is there a way to tell just from pictures if the board is QBUS or UNIBUS?
    Are you looking for something specific?

    ^P
    Data Systems Design A4430-4, 440 interface board, PDP-11, floppy/flexible disk Not that interested in the particular board but it's not the first 3rd party board I've seen that didn't state which bus it was applicable to ...
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  • From Bill Gunshannon@bill.gunshannon@gmail.com to alt.sys.pdp11 on Sat Aug 20 08:11:38 2022
    From Newsgroup: alt.sys.pdp11

    On 8/20/22 07:44, cli...@gmail.com wrote:
    On Friday, August 19, 2022 at 6:00:58 AM UTC-4, P.Lj wrote:
    On Thursday, August 18, 2022 at 1:57:07 PM UTC+2, cli...@gmail.com wrote: >>> Looking at third-party PDP-11 circuit boards for sale on that auction site. >>> Is there a way to tell just from pictures if the board is QBUS or UNIBUS? >> Are you looking for something specific?

    ^P
    Data Systems Design A4430-4, 440 interface board, PDP-11, floppy/flexible disk
    Not that interested in the particular board but it's not the first 3rd party board I've seen that didn't state which bus it was applicable to ...


    I have never had a PDP-11 module third-party or otherwise that had
    anything on the board that said if it was QBUS or UNIBUS. Always
    had to refer to the documentation for that.

    bill
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  • From pbi...@gmail.com@pbirkel@gmail.com to alt.sys.pdp11 on Sat Aug 20 06:18:29 2022
    From Newsgroup: alt.sys.pdp11

    On Saturday, August 20, 2022 at 8:11:41 AM UTC-4, Bill Gunshannon wrote:
    I have never had a PDP-11 module third-party or otherwise that had
    anything on the board that said if it was QBUS or UNIBUS. Always
    had to refer to the documentation for that.

    bill

    Not to mention that there are many, many modules that are neither -- they depend on a specific SU (system unit, "backplane") as part of a CPU, device controller, or other assembly that may-or-may-not have a bus interface at an "edge".

    Being hex-height doesn't even rule out Qbus (thank you PDP-8/A :->).
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  • From pbi...@gmail.com@pbirkel@gmail.com to alt.sys.pdp11 on Sat Aug 20 06:22:44 2022
    From Newsgroup: alt.sys.pdp11

    On Saturday, August 20, 2022 at 9:18:31 AM UTC-4, pbi...@gmail.com wrote:
    Being hex-height doesn't even rule out Qbus (thank you PDP-8/A :->).

    Grrr. Omnibus ...
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