In a message dated 04-16-98, Will Honea said to Kris Steenhaut:
WH>Kris Steenhaut wrote to Will Honea on 04-14-1998
WH>
WH>KS> Sorry to bump in. But it's easy and even recommendable to 
WH>KS> set both LPT1 & LPT2 at IRQ7. And no problem to have both 
WH>KS> printers at work at the same time. Works like champ here 
WH>KS> [HP 4V & Epson SQ2550]. I don't use the /IRQ switch.
WH>
WH>If you don't use the /IRQ switch, it doesn't matter WHAT you
WH>set them to - they are logical and hardware open lines.
WH>
WH>We gotta get this straight again. Assume the /IRQ switch is
WH>SET (USED).  My understanding from the last time this subject
WH>hit the echo was that if you had ports 0x378 and 0x278
WH>installed then OS/2 - not BIOS - would assign one to IRQ 5,
WH>the other to IRQ 7 - can't recall which was which.  I also
WH>don't recall what became of 0x3bc, the default LPT1 and a
WH>second or second and third ports.  Anyone archive this subject
WH>this time around?  Seems to be an annual affair - but I can
WH>never remember what, if any, conclusions were reached.
WH>
Will
    From experience, the following chart shows how the BIOS
assigns LPT port numbers to the three main parallel port
addresses.
           3 Ports  2 Ports  1 Port
           present  present  present
           -------  -------  -------
  LPT1       3BC      378      278
  LPT2       378      278
  LPT3       278
    OS/2 assigns IRQ 7 to LPT1 and IRQ 5 to LPT2.
Don Woodall
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 * MR/2 * PCMCIA - People Can't Memorize Computer Industry Acronyms.
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