Hi Sean, I do not know how did it work and whether it did work. PRINT
definitely runs on IT basis (the ACK causes the printer IT).
Unfortunately, the printer IRQ-s (IRQ7 for LPT1 and IRQ5 for LPT2) are
often misused for another things (e. g. some sound cards defaults IRQ7
also) causing funny things when you try to print with PRINT. Such way, the
IRQ seems to be the bottleneck on the PC from my point of view. Of course,
there are also a few printers with serial interface, or you can install a
multitasking environment, and one task prints a normal way (i. e. with
time slicing).  But it is not the printer spooler for the DOS.  I hope
this helped.
Regards,
Imre


On Tue, 18 May 1999, Sean Breheny wrote:

> Hi Imre,
>
> How does it work on PC's without a printer IRQ? I thought I had used it on
> ones that probably didn't have a printer interrupt.
>
> Sean
>
> At 11:32 AM 5/17/99 +0200, you wrote:
> >Hi,
> >only as a small remark: the DOS print spooler (I do not know whether
> >another ones...) is working on an interrupt basis, as the printer tells
> >with an IT if the data has been printed, so asks for new data. There is no
> >time slicing.
> >Imre
> >
> >
>
> |
> | Sean Breheny
> | Amateur Radio Callsign: KA3YXM
> | Electrical Engineering Student
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