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From: Bart Trzynadlowski <trzy AT powernet DOT net>
Newsgroups: comp.os.msdos.djgpp,comp.lang.asm.x86,alt.lang.asm
Subject: Buffers
Organization: I am not organized.
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Date: Fri, 04 Aug 2000 04:45:27 GMT
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hello,

I need to use certain interrupts in my assembler modules which I link in
with DJGPP, but there are problems when passing buffer addresses.

mov ah, 9
mov edx, msg
int 0x21

The above works great.

But I can't get many of the INT 0x2F (MSCDEX) functions and DOS file I/O
and IOCTL functions to work. I know it's possible, because I've seen
software written using DJGPP+NASM that uses MSCDEX.

I've tried everything and looked everywhere and am quite desparate for
help...

DJGPP has some C functions defined in DOS.H for opening files with
_dos_open() and I can open the CD-ROM driver, but how do I write to it
using DOS's IOCTL functions? I don't see anything of the sort in DOS.H.

I'm using Ralf Brown's Interrupt List and various MSCDEX documents,
they're all intended for real mode though...


Thanks a lot,


Bart