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- From: jong-min@cae.wisc.edu (Jong-Min Park)
- Newsgroups: comp.os.ms-windows.misc
- Subject: Re: COM3 and IRQ5
- Message-ID: <1992Dec29.200728.9094@doug.cae.wisc.edu>
- Date: 30 Dec 92 02:07:28 GMT
- References: <L2s3VB1w165w@bluemoon.use.com> <1992Dec28.185430.16687@mksol.dseg.ti.com>
- Organization: U of Wisconsin-Madison College of Engineering
- Lines: 25
-
- In article <1992Dec28.185430.16687@mksol.dseg.ti.com> mccall@mksol.dseg.ti.com (fred j mccall 575-3539) writes:
- >In <L2s3VB1w165w@bluemoon.use.com> gerry@bluemoon.use.com (Gerard M. Foley) writes:
- >
- >> I find that my terminal program QModem 4.2 appears to have COM3 and
- >>IRQ5 selected. The manual for the modem refers only to the standard
- >>......
- >> If anyone can post a simple explanation of IRQ's and serial ports, I
- >>for one will appreciate it.
- >
- >Ok, simple explanation. Any piece of hardware that needs to request
- >Some software gets upset if you try to do that.
- >......
- >So, anyway, what people often do is to set COM3 and COM4 to unused
- >IRQ's. The two most commonly used are IRQ5 (which is normally LPT2,
- >......
- >--
- >"Insisting on perfect safety is for people who don't have the balls to live
- > in the real world." -- Mary Shafer, NASA Ames Dryden
- >------------------------------------------------------------------------------
- >Fred.McCall@dseg.ti.com - I don't speak for others and they don't speak for me.
-
- Why do some programs (e.g. a Naval Observ. timekeeping program running under
- Windows) lets you choose COM1-4 ports while fixing IRQs to default (IRQ4 for
- COM3, IRQ3 for COM4)? I hope application programs let you choose both COM1-4
- and IRQs (unless they don't use interrupts, but I doubt it).
-