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From: hase@netmbx.UUCP (Hartmut Semken)
Newsgroups: comp.sys.atari.st
Subject: Re: DeskJet fright
Message-ID: <3055@netmbx.UUCP>
Date: 13 Jul 89 06:34:05 GMT
References: <890711.19492732.085188@SFA.CP6>
Reply-To: hase@netmbx.UUCP (Hartmut Semken)
Organization: netmbx Public Access Unix, Berlin, West Germany
Lines: 64

In article <890711.19492732.085188@SFA.CP6> Z4648252@SFAUSTIN.BITNET (Z4648252) writes:
>    Question.  Will Diana or anyone else place a schematic for the
>buffer that will correct everything?  I'm convinced now that I had
>better build this thing.  I use my DeskJet DAILY and fear what *might*
>happen!  'whimper'...

This one will do:

ST Parallel  7407

D0            |\
--------------| >------ to Printer D0
              |/

D1            |\
--------------| >------ to Printer D1
              |/

D2            |\
--------------| >------ to Printer D2
              |/

D3            |\
--------------| >------ to Printer D3
              |/

D4            |\
--------------| >------ to Printer D4
              |/

D5            |\
--------------| >------ to Printer D5
              |/

D6            |\
--------------| >------ to Printer D6
              |/

D7            |\
--------------| >------ to Printer D7
              |/

STROBE       |\
-------------| >------- to Printer STROBE
             |/

The layout of the parallel ports 25-pin SUB D connector is found in the
ST "manual".

The 7407 has 6 open collector drivers, so you need 2 of them (the pullup
resistor are in the printer).  the +5volts for the drivers you can get
from the joystic port (useful with the ST 1040; not useful with the
Megas :-) or from somewhere inside the ST, perhaps the power connector
to the internal drive (use some plugeble T-adaptor: easy to install,
easy to remove...).

That does it for a Seikosha cp80 (really weird, old thing) and my Epson
still works just fine.

hase
-- 
Hartmut Semken, Lupsteiner Weg 67, 1000 Berlin 37 hase@netmbx.UUCP
If there is something more important than my Ego, I want it caught and shot.
Now! (Zaphod Beeblebrox)