Article View: comp.os.msdos.programmer
Article #4381Re: problems with com3 & com4
From: Peter Yeung
Date: Sun, 27 Jan 1991 03:47
Date: Sun, 27 Jan 1991 03:47
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1615 bytes
In article <1991Jan25.054228.157@frey.newcsatle.edu.au> kaos@frey.newcsatle.edu.au (Iain `Kaos' Holmes) writes:
>
> cause i can write to the ports and they react but i think the interupts
>
> are screwy...
>
Which interrupt are you using? Since the original PC does not have provision
for com3/4, the interrupt to be used is implementation dependent.
Most implementations chose to share the interrupts with those being used
by com1/2. Also, typically, those async cards supporting com3/4 also allow
the user to choose the interrupt/port address etc. So, make sure you are
catching the interrupt same as the one setup on the card!
>--
> Iain "Kaos" Holmes. +---------+
> ACSnet :kaos@frey.nucastle.edu.au | ~ ~ | Remember, Always keep your feet
> | (o o) | on the ground, your eye on the
> Phone : (049) 26-2926 home | (_) | clock, your finger on the pulse
--
Peter Yeung Amdahl Canada Ltd., Software Development Center
2000 Argentia Road, Plaza 2, Suite 300
Mississauga, Ont. L5N 1V8
Phone: (416) 542-6300 Fax: (416) 858-2233
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Newsgroups: comp.os.msdos.programmer Path: arc1-ca.pugleaf.net!utzoo!censor!meadow!py From: py@meadow.uucp (Peter Yeung) Subject: Re: problems with com3 & com4 Message-ID: <1991Jan27.034726.15865@meadow.uucp> Keywords: com3 com4 Reply-To: py@meadow.UUCP (Peter Yeung) Organization: Amdahl Canada Ltd., Software Development Center References: <1991Jan25.054228.157@frey.newcsatle.edu.au> Distribution: comp Date: Sun, 27 Jan 91 03:47:26 GMT