Path: utzoo!utgpu!watmath!att!occrsh!uokmax!apple!mips!prls!pyramid!ctnews!mitisft!dold
From: dold@mitisft.Convergent.COM (Clarence Dold)
Newsgroups: comp.periphs
Subject: Re: How fast can a typical Laser printer Centronix Interface go?
Message-ID: <1290@mitisft.Convergent.COM>
Date: 16 Nov 89 21:26:35 GMT
References: <218@cmic.UUCP>
Organization: Convergent Technologies, San Jose, CA
Lines: 20

in article <218@cmic.UUCP>, garvey@cmic.UUCP (Joe Garvey) says:
> 
> I was told by a vendor that the Centronix interface in a typical (Laserjet II)
> interface would only transfer data at about 50 Kbaud (yes I know it's byte
> wide, but it's easier to compare to a serial interface this way).

We recently drove a parallel interface printer at a full 30PPM, 80 columns,
60 Lines Per Page.  That works out to (excuse me while I !bc) 24Kbaud.
If you can find a printer faster than 30PPM, maybe it matters.
We also found that the 37PPM printer didn't like our UNIX a whole lot.
We would blast data to the printer at 50KBytes /second (yes it is Byte wide),
then go away for a while, then blast more data...
The data link is theoretically capable of 6uSec cycles, or 166KBytes,
but the priorities aren't keen on high printer load.
A serial link at 19.2K turned out to be much better.
-- 
---
Clarence A Dold - dold@tsmiti.Convergent.COM		(408) 434-5293
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