From: jimc@hal.gnu.ai.mit.edu (James Carpenter) Subject: Re: Serial IRQ polling Date: 16 Dec 1992 03:26:54 GMT
In article <ADAMS.92Dec16013812@PDV2.pdv2.fmr.maschinenbau.th-darmstadt.de> adams@pdv2.fmr.maschinenbau.th-darmstadt.de (Adams) writes:
>There is no reasonable way to poll a device in a multi user or
>realtime environment. Attaching to a timer
>will lead to a desastrous performance loss, and hooking the
>CPU will disable multitasking.
It is interesting that Coherent could do this with no problem. There was a
small decrease in speed but who cared... it ran unbelivably slow anyway.
>If there would be enough interest, it would be neither too hard nor
>too expensive to throw an expansion card together, handling 2-4 serial
>ports without any intervention of CPU.....
That sounds rather nice.
-Jim Carpenter
CARPENTER@Eisner.DECUS.Org
jimc@gnu.ai.mit.edu