Date: Wed, 31 Jul 1996 17:16:52 +600 CDT From: "Larry Dolinar" <LARRYD@bldg1.croute.com> To: questions@freebsd.org Subject: reply to Re: Son of Re: irq 12 Message-ID: <98182473F83@bldg1.croute.com>
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| From: "M.R.Murphy" <mrm@Mole.ORG>
| [...]
| > | 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,
I'm aware of that -- a little background:
the IDE controller is a DTC2278 with all ports except game enabled,
parallel is irq7
the other lpts are clone DTC-2280's (right down to the silkscreen
and jumper positions) with ONLY parallel ports enabled
- lpt1 is irq 5
- lpt2 is not jumpered for an interrupt (only 5 and 7 offered),
which I realize does not necessarily imply "no 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,
Not an option with the current hardware, but I'll certainly consider
better if FreeBSD supports it and it's not too pricey.
| 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.
Which for me would be a liitle difficult without a schematic 8).
| --
| Mike Murphy mrm@Mole.ORG +1 619 598 5874
| Better is the enemy of Good
|
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