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From: resnicks@netcom.UUCP (Steve Resnick)
Newsgroups: comp.os.msdos.programmer
Subject: Re: MSC 5.1 Question
Message-ID: <22431@netcom.UUCP>
Date: 31 Jan 91 18:12:09 GMT
References: <91026.223149ACPS2924@Ryerson.Ca> <1991Jan30.181122.5734@murdoch.acc.Virginia.EDU> <676@dtg.nsc.com>
Organization: Netcom- The Bay Area's Public Access Unix System {408 241-9760 guest}
Lines: 39

In article <676@dtg.nsc.com> moore@dtg.nsc.com (Joseph Moore) writes:
>>In article <91026.223149ACPS2924@Ryerson.Ca> ACPS2924@Ryerson.Ca writes:
>>Is it possible in MSC 5.1 to gain access to the registers directly.
>>Turbo C has the _AX,_BX... pseudo-variables for them
>>is this possible in MSC and if so HOW???
>>
>Yes, it's possible, but as far as I know only for interrupt calls,
>using the dos.h library structures REGS and SREGS.
>See the documentation in the run-time library reference under int86 
>and int86x (pp 365-369), or send me email for more info.
>

This is not the same thing, Joe. The Turbo C psuedo-variables are referenced
as the register values at that point in the code. When you call int86, 
you are setting up a routine which loads the register variables from
REGS and SREGS, calling your favorite interrupt and then reloading the
variables back from the registers. This is, however, different than the
psuedo-variables. In Turbo C, if you had a line of C which read:

	int x = _AX;

The resulting 80x86 code would be 

	mov [x],AX		(x in this context is dependant on memory 
				 model)

This cannot be done in MSC 5.1. It can't.

Cheers!
Steve

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