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- Newsgroups: comp.os.ms-windows.misc
- Path: sparky!uunet!cs.utexas.edu!csc.ti.com!tilde.csc.ti.com!mksol!mccall
- From: mccall@mksol.dseg.ti.com (fred j mccall 575-3539)
- Subject: Re: COM3 and IRQ5
- Message-ID: <1992Dec30.133027.28481@mksol.dseg.ti.com>
- Organization: Texas Instruments Inc
- References: <L2s3VB1w165w@bluemoon.use.com> <1992Dec28.185430.16687@mksol.dseg.ti.com> <1992Dec29.200728.9094@doug.cae.wisc.edu>
- Date: Wed, 30 Dec 1992 13:30:27 GMT
- Lines: 41
-
- In <1992Dec29.200728.9094@doug.cae.wisc.edu> jong-min@cae.wisc.edu (Jong-Min Park) writes:
-
- >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).
-
- Most do. In point of fact, Windows will let you change the addresses
- and IRQs associated with COM ports, so I'm not sure just what problem
- you're having with the particular program you mention (I've never used
- that one). Windows application programs won't, of course, since they
- aren't supposed to be talking directly to the hardware in the first
- place (and don't need to change them, since Windows takes care of that
- for all of them).
-
- --
- "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.
-