[ On Wednesday, June 27, 2001 at 09:28:40 (+0200), Thomas Michael Wanka wrote: ]
> Subject: Re: IBM PC Server
>
> IIRC LPT1 was at 0x378 at IRQ 7, LPT2 at 0x278 at IRQ 5, and 
> LPT3 at 0x3BC at IRQ 7. 
> 
> IIRC it works something like this: if 3BC is there and no 378 it is 
> treated as LPT1, if 378 is present it will be LPT3. But I might be 
> totally wrong. 

That's more or less exactly what the "Hardware Bible" says, though they
don't say what IRQ the monochrome adapter port is usually at, they just
say that the first port is IRQ 7 and the second port is IRQ 5.
 
> I have one PC with onboard LPT and MGA that runs NetBSD (but 
> there is no printer attached it works as a firewall machine).

That config should still work with my suggested:

  lpt0	at isa? port 0x3bc irq 7	# monochrome parallel port
  lpt0	at isa? port 0x378 irq 7	# standard PC parallel ports
	
except of course the onboard LPT won't be configured unless you build a
custom kernel.

> And one of my customers has  a printserver with 3LPTs and 3 high 
> speed dot matrix printers attached (DFX5000 ?). There is no 
> network interface for these printers available and the data they have 
> to spool can be rather large, so a "small" print server is out of 
> question.

That sounds like a custom configuration....

Do you know if they're using ISA printer cards, and which IRQs they're
using, if any?

> I do not know what OS is used (netware 312 or 
> something), it was just to demonstrate some of such machines do 
> exist in the wild.

I didn't really mean to suggest that they didn't exist, but rather only
to say that they would be the exceptions and a GENERIC kernel configured
as I suggest will still boot on them, but just not provide access to all
the parallel ports.

-- 
							Greg A. Woods

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