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From: djo7613@blake.acs.washington.edu (Dick O'Connor)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: Sys Req - key.
Keywords: SysReq
Message-ID: <4783@blake.acs.washington.edu>
Date: 6 Dec 89 17:35:09 GMT
References: <187@nmtvax.nmt.edu> <1989Dec5.190738.17084@ux1.cso.uiuc.edu> <20358@pasteur.Berkeley.EDU>
Reply-To: djo7613@blake.acs.washington.edu (Dick O'Connor)
Organization: University of Washington, Seattle
Lines: 19

In article <20358@pasteur.Berkeley.EDU> cs9a-ax@dorothy.Berkeley.EDU.UUCP (Mike Morrison) writes:
>This is at least partially false.  On my machine, an XT clone, the sys-req
>key DOES use int 09.  (int 15h is for cassette io).  It generates ascii 00, 
>scan code 37h.  When num-lock is on it generates ascii 77h, scan code 54h.
>The rest of the posting sounds ok to me, though -- I don't have any idea what
>the key is supposed to be used for.
>

My copy of the Much-Feared MSDOS Interrupt List does indeed list cassette
functions for Interrupt 15, AH=00, 01, 02, and 03.  It also lists Interrupt
15, AH=85 as an OS Hook (System Request Key Pressed) for AT, XT2, XT286,
Convertible and PS type machines.

Isn't INT 09 usually a keyboard interrupt?

"Moby" Dick O'Connor                            ** DISCLAIMER: It would
Washington Department of Fisheries              ** surprise me if the
Olympia, Washington  98504                      ** rest of the Department
Internet Mail: djo7613@blake.u.washington.edu   ** agreed with any of this!