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- From: dspascha@eos.ncsu.edu (DAVID SCOTT PASCHAL)
- Newsgroups: comp.os.msdos.programmer
- Subject: Re: Trapping INT 21 is easy.
- Message-ID: <1992Sep1.215423.29910@ncsu.edu>
- Date: 1 Sep 92 21:54:23 GMT
- References: <1992Aug31.230136.2195@brandonu.ca>
- Sender: news@ncsu.edu (USENET News System)
- Reply-To: dspascha@eos.ncsu.edu (DAVID SCOTT PASCHAL)
- Organization: North Carolina State University, Project Eos
- Lines: 10
- Originator: dspascha@c00089-100lez.eos.ncsu.edu
-
-
- Hi. Whenever the 80x86 invokes an interrupt handler, it clears the interrupt
- and trap flags after it pushes the old copy onto the stack. In a non-hardware
- interrupt handler it's generally a good idea to re-enable interrupts (with STI)
- but always disable them when you chain to the previous handler. I'm not sure if
- this is the problem in your case (sounds really weird!) but it might be
- something to check on.
-
- Tschuess,
- David Paschal
-