Hi,
sounds interesting. I would check both statements.
Imre


On Tue, 18 May 1999, Peter van Hoof wrote:

> The dos print spooler polls the parallel port on the timer interrupt, no
> interrupt from the printer is needed
>
> -timer interrupt jumps to hooked service routine (about 18 times a second)
> -printer status check
> -if printer buffer empty send new characters
> -if printing done unhook timer interrupt
> -jump to original timer service routine
> -original timer service routine returns controll to dos till next timer
> interrupt
>
> Peter pvh@vertonet.com
>
>
> -----Original Message-----
> From: Sean Breheny <shb7@CORNELL.EDU>
> To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
> Date: Tuesday, May 18, 1999 8:42 PM
> Subject: Re: Multitasking without interrupt ?
>
>
> >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
> >\--------------=----------------
> >Save lives, please look at http://www.all.org
> >Personal page: http://www.people.cornell.edu/pages/shb7
> >mailto:shb7@cornell.edu ICQ #: 3329174
>
>