interrupt far functions in Microsoft 5.1

[Martin O'Nions]

lorvig at gsg.UUCP (Don Lorvig) writes:


> have been using void far interrupt routines for some time now.  The
>addresses of this routines are passed to a TSR which executes them.
>Recently I began attempting to make this functions more complex. (They
>merely set flags before). When I attempt function calls from within
>these interrupt routines, strange behavior results.

Probable causes are assumptions made by the C as to the state of segment
registers, or stretching the stack beyond its intended length. I normally
use an assembler interrupt handler, and call the compiled C after setting
the stack and registers to appropriate values,changing them back afterwards.

Mail me if you want details - I may be able to resurect some code if I dig
deep enough.

Martin

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Martin O'Nions            Logitek Group Support      martino at logitek.co.uk
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