On 04-23-97, MARK WRIGHT said to STEVE CAVANAUGH:
MW>Sure, parallel ports use irq 5 or 7 when set to epp ecp modes, sound
MW>cards, net cards, and modems use the same. Parallel ports havent used
MW>interrupts for years unless using postscript. 3 devices, 2 interrupts.
My HP 5L is sure using an interrupt (IRQ7 for LPT1) for PCL.  It's not a
function of the printer language - it's only for high speed communication 
ith
whatever's attached to the port...
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