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- Xref: sparky comp.unix.sys5.r4:1101 comp.unix.pc-clone.32bit:945
- Path: sparky!uunet!destroyer!mudos!mudos!not-for-mail
- From: mju@mudos.ann-arbor.mi.us (Marc Unangst)
- Newsgroups: comp.unix.sys5.r4,comp.unix.pc-clone.32bit
- Subject: Re: Problem with lp. Got me stumped. (email, I'll sum)
- Date: 1 Jan 1993 21:00:28 -0500
- Organization: The Programmers' Pit Stop, Ann Arbor MI
- Lines: 34
- Message-ID: <1i2svsINNdgt@mudos.ann-arbor.mi.us>
- References: <1hv6jmINN9rk@spool.mu.edu> <1993Jan1.101821.414@pphbau.atr.bso.nl>
- NNTP-Posting-Host: mudos.ann-arbor.mi.us
-
- In article <1993Jan1.101821.414@pphbau.atr.bso.nl> paul@pphbau.atr.bso.nl (PPH Bauwens) writes:
- >Most LP problems under ESIX SVR4 (or any other UNIX) come from substandard
- >hardware with inoperable LP interrupt. DOS does _NOT_ use the LP interrupt
- >but performs busy wait.
-
- You're correct that most Unix problems with the parallel port come
- from substandard boards that don't do interrupts correctly. However,
- you will *not* see data-overrun problems with a board that doesn't do
- interrupts properly. Instead, you will see very SLOW output as the lp
- driver repeatedly times out after not getting the interrupt it was
- expecting.
-
- At any rate, I *did* check my parallel ports. I even tried them under
- a different Unix (SCO Unix 3.2v4.0), where they worked fine. And when
- I reported the problem to Esix, they acknowledged that they had
- flow-control problems with their parallel port driver.
-
- >I routinely use GhostScript 2.4 to print postscripted manpages on my
- >HP Deskjet without any problems AND THIS IS BITMAP DATA (>300K/page).
- >Speed is about 1.5-2 pages / minute, the Deskjet busy all the time!
- >On a 486 system loading during this is about nil.
-
- It seems to be very printer-specific. On an Abaton LaserScript LX,
- the printer drops characters all over the place. On my Panasonic
- KX-P4420, it only drops about 1-2 characters at the beginning of each
- page. I would be willing to bet that your DeskJet doesn't drop
- characters because it isn't a page printer, so there's no significant
- lag at the end of each page while the page is printed and ejected.
-
- --
- Marc Unangst, N8VRH | "Of course, in order to understand this you
- mju@mudos.ann-arbor.mi.us | have to remember that the nucleus of the atom
- | is squishy."
- | -W. Scheider, from a Physics lecture
-