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Date: Wed, 31 Jul 1996 14:29:12 -0700
From: "M.R.Murphy" <mrm@Mole.ORG>
Message-Id: <199607312129.OAA08017@meerkat.mole.org>
To: LARRYD@bldg1.croute.com, questions@freebsd.org
Subject: Re: Son of Re: irq 12
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[...]
> |    lpt0 = 0x3bc/7, lpt1 = 0x378/5, lpt1 = 0x278/(upto card)
>
> Indeed you'll see the wee beasties are set accordingly (I hope that last 
> 'lpt1' was a typo).
[...]
> lpt0 at 0x3bc-0x3c3 on isa
> lpt1 at 0x378-0x37f on isa
> lpt2 at 0x278-0x27f on isa

1) they can't share an interrupt,
2) if a stray interrupt occurs and is caught by irq 7 at the
   wrong time, it can confuse the lp driver,
3) I haven't seen 2) above since 1.1.5.1 :-),
4) try just 0x378/5 and 0x278/{4,3} interfaces as lpt0 and lpt1 if
   they'll do it, that is, no irq 7 lp, no shared irq, and only 2
   interfaces,
5) to get 3 lp's to work, I used an MGP and 2 single LP cheap boards
   and X-acto, solder and wire to change the IRQ on the second single LP.
--
Mike Murphy  mrm@Mole.ORG  +1 619 598 5874
Better is the enemy of Good