From: Endlisnis <s257m AT unb DOT ca>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: using function 0x3f of int 0x21 hangs my machine
Date: Wed, 26 Aug 1998 19:33:45 -0300
Organization: NBTel Internet
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Paszek wrote:

> When I take over int 0x8, and call function 0x3f of int 0x21 (disk
> read), my computer hangs. This only happends under DOS, under WIN95
> everythink works ok. What is strange restoring old vector beafore
> reading from disk doesn't help.

    You are not allowed to call any DOS/BIOS functions from inside an
interrupt.  Win95 doesn't inforce it, but CWSDMPI does.

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