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From: veit@borneo.gmd.de (Holger Veit)
Subject: Re: Regarding cables with lpt [NetBSD-0.9] [386BSD-0.1]
Message-ID: <1993Sep26.163628.25349@gmd.de>
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References: <283plm$igg@sylvester.cc.utexas.edu>
Date: Sun, 26 Sep 1993 16:36:28 GMT
Lines: 46
>Here is the result of the continuity test for the lpt cable:
>Male 25-pin Dshell Female Centronics 50 "pin"
>1-14 1-14
>15 32
>16 31
>17 36
>18 33
>19,20,21,22,23,24 19,21,23,25,27,29
>25 30
>
>Symptoms: printer not recognized on bootup under 386BSD-0.1 pk0.2.3
>or NetBSD-0.9... printer IS recognized if a printer switch is used to
>detach it during bootup. Printer is a HP-LJ2, not a bottom-of-the-barrel
>line printer.
>VaX#n8 vax@ccwf.cc.utexas.edu - Don't blame me if the finger daemon is down
Well, since I am notorious for "check your cable first" responses, the
following is my cable. I made this exactly after the description in my
HP-LJ-4L manual (apx. A-2). This is a "bi-tronics" interface cable
(i.e. the LJ4L printer can send responses back to the computer), but I
doubt this should be a problem with a printer that doesn't.
It differs in details to your setting.
male 25pin 36 pin Centronics (did you really have a 50 pin?
this could be a SCSI then? I doubt so)
1-14 1-14
15 32
17 36
18-25 19-24 all tied together
What is interesting is that pin 16 (D-Shell conn) is unconnected here.
This is (according to IBM tech ref manual) the "init" line
(from computer to printer) that sends a reset (low pulse 50 ms).
I actually opened my cable just now to verify this is true - it is!
And I remember, when I had problems (but reboot, not deselect)
that this line was connected; was solder at the pin.
Hope this helps.
--
Dr. Holger Veit | INTERNET: Holger.Veit@gmd.de
| | / GMD-SET German National Research | Phone: (+49) 2241 14 2448
|__| / Center for Computer Science | Fax: (+49) 2241 14 2342
| | / P.O. Box 13 16 | Had a nightmare yesterday:
| |/ Schloss Birlinghoven | My system started up with
53731 St. Augustin, Germany | ... Booting vmunix.el ...