Path: utzoo!mnetor!uunet!husc6!mit-eddie!ll-xn!singer
From: singer@XN.LL.MIT.EDU (Matthew R. Singer)
Newsgroups: comp.sys.atari.st
Subject: Re: HP DeskJet problems
Message-ID: <986@xn.LL.MIT.EDU>
Date: 4 May 88 12:49:59 GMT
References: <8804261549.AA04870@decwrl.dec.com> <3636@fluke.COM>
Organization: MIT Lincoln Laboratory, Lexington, MA
Lines: 31
Summary: ST->printer problems

In article <3636@fluke.COM>, jfadams@tc.fluke.COM (Jim Adams) writes:
> In article <8804261549.AA04870@decwrl.dec.com> paulhus@euclid.dec.com (N. Chris Paulhus DTN 223-6871 MLO 8-3/T13) writes:
> >
> >  I'm having problems getting a Hewlett Packard DeskJet printer
> >  to communicate with my ST. ...
> 
> I have a similar problem with my LaserJet Series II.  It works fine with my
> Epson IBM Clone, but refuses to print anything sent by my ST.  The problem
> lies in the termination resistors in the HP.  Their values are < 2 kOhm, and
> require more current to drive than the Yamaha chip in the ST can deliver.
> The solution, according to Atari's Service Bulletin (I saw a copy this week-
> end), is to replace the termination resistors in the printer with higher
> valued resistors >3.3 kOhm, [or buy an Atari printer ;^)].
> 
> Oh, incidently, I'm told that not all STs exhibit this behavior.  Wonderful,
> no?  I've already had to replace my marginal DMA chip so I could communicate
> with my Hard Disk, my MMU [sic] so I could run Spectrum, and now they tell
> me I need to replace my Laser Printer! :^|
> 
> -- 
> James F. Adams       John Fluke Mfg. Co., Inc.        Everett, Washington USA




I too have a related problem.  I have an ST and a 386 clone hooked up to
a Citizen MSP-20.  Both machines can talk to the printer just fine when
cabled directly, but if I put a switch box in between, then the ST
wont talk to it....

M. Singer