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From: ross@isis.UUCP
Newsgroups: net.micro.pc
Subject: Interupt initiated user-defined functions in 'C' on IBM/XT
Message-ID: <938@isis.UUCP>
Date: Tue, 15-Jul-86 19:39:01 EDT
Article-I.D.: isis.938
Posted: Tue Jul 15 19:39:01 1986
Date-Received: Wed, 16-Jul-86 22:34:37 EDT
Reply-To: ross@isis.UUCP (Ross McConnell)
Organization: University of Denver Math and Computer Science
Lines: 14

We would appreciate any information about invoking user-written subroutines
through the use of an IBM/XT clocked interrupt (INT 0x1C).  Currently, we have
troubles obtaining the segment:offset representation of the interrupt vector.
The seg:offset obtained by ANDing a long pointer (AZTEC compiler V2.0) with  
0xFFFFL and ~0xFFFFL do not appear to correctly represent the location of the
function although AZTEC says the pointers are in 32-bit seg:offset formate.

Any information will be appreciated and may be put on the network or sent to:
Dave Knopp
c/o Vexcel Corp.
2905 Wilderness Pl.
Boulder, CO  80301

Thanks for the help.