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From: gemini@geminix.in-berlin.de (Uwe Doering)
Newsgroups: comp.unix.sysv386
Subject: Re: FAS 2.08 space-c1-3 question
Message-ID: <067NHCL@geminix.in-berlin.de>
Date: 15 Feb 91 12:44:16 GMT
References: <9102141833.AA01429@enuxha.eas.asu.edu>
Organization: Private UNIX Site
Lines: 22

gomez@enuxha.eas.asu.edu (Jose L. Gomez-Rubio) writes:

>I have a COM3-4 board that uses INT/IRQ 2 & 5.  I have a Logitech bus mouse
>using INT 5.  Can COM3 and bus mouse co-exist?  It is mentioned that
>I may need to "or" HAS_FIFO macro.  If not possible, I can use COM4 at INT 2.
>Anyone know the value I replace for fas_vec array value 0x9?  I would
>prefer that I use all COM1-4 ports.  All UARTs are NS16550AFN.

For this kind of serial card you need a separate IRQ line for every
port. And no, it can't share an IRQ with a bus mouse. That's all due to
hardware limitations in the AT bus design, and not a problem with FAS.

Therefor, you can only use as much ports as you have IRQs available. BTW,
the macro you mention is `NO_FIFO', not `HAS_FIFO'. But it doesn't have any
effect with bus mice, anyway (it's only for serial mice connected to
an FAS port).

     Uwe
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