Need 3b1-end pinouts for parallel interface
Ward Griffiths
ward at tsnews.Convergent.COM
Wed Feb 20 11:08:08 AEST 1991
dlb5404 at tamuts.tamu.edu (Daryl Biberdorf) writes:
>I was going to hook up the old C.Itoh Prowriter 8510 this weekend
>when I noticed that my 3B1 uses a female centronics connector instead
>of the more common DB-25 for its parallel port. After calling around,
>no local businesses stock the male centronics-male centronics cable I need
>and special ordering it looks like it will cost more than I think it should.
>:) So I guess I'll make my own.
You can get the clamp-on Centronics connectors and the ribbon
cable at any Radio Shack, and I believe that the Radio Shack
Computer Centers stock an assembled "printer extension cable"
that has the two correct connectors as well. Remember, the
"more common" DB-25 connector was not used for parallel ports
untill the IBM PC came out, with a male instead of female
serial connector (female makes a lot more sense to me -- if a
pin breaks it's easier and cheaper to replace a cable than to
repair the CPU) and a parallel connector that looked like
everybody else's serial connectors. In the early days, I saw
several examples of hardware fried by folks thinking that it
was a serial port. Of course, nothing like the time someone
plugged a Tandy Daisy Wheel Printer II (a machine I had thought
impossible to break) into the female DB-25 connector that
serves signal AND power to AT&T monitors in the back of an AT&T
6300. Smoke city for CPU and printer.
>Anyway, I have the pinouts for the printer (equivalent to the Apple
>Imagewriter I and the AT&T 470, I believe), but I don't have them
>for the computer. Can anyone help?
Pin one to pin one, pin 36 to pin 36, and everything in between
follow suit.
>These pin numbers are for the standard 36-pin Centronics-style connector.
>Will I need a full 36-conductor cable to accomplish all these connections?
>(33 if I ignore the NC pins) If so, how does a clone accomplish
>parallel communications with a DB-25 connector and still allow for
>communications TO the machine through that connector?
IBM did away with a number of redundant ground lines that were
in the 36-pin connectors.
--
Ward Griffiths, Unisys NCG aka Convergent Technologies The people that make Unisys' official opinions get paid more. A LOT more.
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