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From: | Vinzent Hoefler <JeLlyFish DOT software AT gmx DOT net> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: Libnet serial port problem |
Date: | Wed, 15 Jan 2003 10:07:01 -0500 |
Organization: | JeLlyFish software |
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Message-ID: | <let30b.la2.ln@jellix.jlfencey.com> |
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To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
Ismo Salonen wrote: > Actually the problem is hardware related. On older computers the IRQ > line is > high level active. Each uart drives the irq line it is connected to > via tristate buffer. The buffer is enabled with a bit in the uart. If > two uarts drive the same line then results are unpredictable. So this is bad hardware design. As always. But anyway, the OP talked of COM1/2. Those ports usually do not share the same IRQ. Vinzent. -- Ten years of rejection slips is nature's way of telling you to stop writing. -- R. Geis
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