Path: utzoo!attcan!uunet!know!zaphod.mps.ohio-state.edu!usc!apple!agate!shelby!rutgers!cbmvax!grr
From: grr@cbmvax.commodore.com (George Robbins)
Newsgroups: comp.unix.ultrix
Subject: Re: serial port on DS5000 not responding fast enough to CNTRL/S?
Keywords: LaserJetIII
Message-ID: <15335@cbmvax.commodore.com>
Date: 23 Oct 90 02:02:01 GMT
References: <900@usage.csd.unsw.oz.au> <1990Oct21.123733.2924@sti.fi>
Reply-To: grr@cbmvax.commodore.com (George Robbins)
Organization: Commodore, West Chester, PA
Lines: 39

In article <900@usage.csd.unsw.oz.au> mcba@newt.phys.unsw.OZ.AU (Michael C. B. Ashley) writes:
>I have a LaserJet III connected to one of the serial ports on a
>DECstation 5000. My problem is that when I send long files to the
>printer, it loses about 30 bytes every time the LaserJet's input buffer
>fills up. What I think is happening is that the LaserJet is sending a
>control/S to the DS5000 to tell it to stop sending output, and the
>DS5000 doesn't take notice of the control/s until it has sent another 30
>bytes.

Does the LJ have a setting for the the control/s threshold? There's
no particular guarantee that control/s stops transmission after only
one or two characters and you may need to jack up the threshold
appropriately.  On the other hand, the Ultrix driver could be broken...


> 
> Just for the record, we had exactly this same problem when printing from 
> a DS2100 to a Ljet III (with Adobe PS cartridge). Hooking the printer to
> a VAXstation 2000 that we had lying around solved the problem. Both machines 
> run ULTRIX V4.0 - it appears to be hardware based (or device driver). I 
> thought the problem was related to the infamous DS2100/DS3100 -serial port 
> problems and figured that when we get our DS5000 it would be fixed... Your 
> experience seems to indicate that the situation is worse than expected.
> 
> Does any know if this is a known problem with ULTRIX/RISC or the HW ?
> 
> Timo
> 
> -- 
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-- 
George Robbins - now working for,     uucp:   {uunet|pyramid|rutgers}!cbmvax!grr
but no way officially representing:   domain: grr@cbmvax.commodore.com
Commodore, Engineering Department     phone:  215-431-9349 (only by moonlite)