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- Path: sparky!uunet!destroyer!cs.ubc.ca!unixg.ubc.ca!erich.triumf.ca!bomr
- From: bomr@erich.triumf.ca (Rod Nussbaumer)
- Newsgroups: comp.os.msdos.programmer
- Subject: Re: Relationship between IRQ's & INT's ?
- Date: 30 Dec 1992 11:56 PST
- Organization: TRIUMF: Tri-University Meson Facility
- Lines: 22
- Distribution: world
- Message-ID: <30DEC199211564476@erich.triumf.ca>
- References: <C02IqK.11E@dutiws.twi.tudelft.nl>
- NNTP-Posting-Host: erich.triumf.ca
- News-Software: VAX/VMS VNEWS 1.41
-
- In article <C02IqK.11E@dutiws.twi.tudelft.nl>,
- kleyngel@dutiws.twi.tudelft.nl (Raymond Kleijngeld) writes...
- >I know that an IRQ is a hardware interrupt and an INT is a software
- >interrupt. Though I can't figure out what the relationship is between those
- >two.
- >
-
- IRQ is the term used in the 8259 Programable Interrupt Controller, for
- the input pins used to accept Interrupt ReQuests. INT is the term used in
- the Intel CPU mnemonics. Since the IRQ is fundamentally a hardware entity,
- the only way to 'intercept' it is to intercede at the hardware level, by
- rearranging jumpers, cutting traces, and other unnatural acts. However,
- there is the possibility of intercepting the software interrupt service
- routine invoked by a hardware interrupt, since the CPU INTerrupts are mapped
- one-to-one to IRQ's.
-
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Rod Nussbaumer, Programmer/Technologist Bitnet: BOMR@TRIUMFER
- TRIUMF --- University of British Columbia, Internet: bomr@erich.triumf.ca
- Vancouver, BC, Canada. Phone: (604)222-1047 ext 510
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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