Re: int 0x13 utility

On Sun, 30 Mar 2008 13:53:33 +0200, "Wolfgang Kern"
<spamtrap@xxxxxxxxxx> wrote:

That's what I mean. DOS-executables running in a windoze-DOS-box can
access I/O if the Os grants permission (ie:'LOCK', Admin-rights...).
I disassembled sblaster.com used in my DOS-box of win98se, it direct
hooks interrupt 66/67h and rd/wr from ports e000h... without problems.

As far as I know, Win9x doesn't block I/O accesses at all, even in
normal Windows mode. On the other hand, WinNT, XP, and later require
a special Ring0 device driver to grant access to Ring3 programs. That
includes DOS box operation as well, I believe.

Best regards,


Bob Masta

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