Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!mcsun!ukc!tcdcs!wsl!john
From: john@wsl.UUCP (John Allen on wsl)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Magic Number Five in turbo C, MS C, and int 21/0E
Message-ID: <269@wsl.UUCP>
Date: 12 Oct 89 21:25:11 GMT
References: <483@schaefer.MATH.WISC.EDU>
Reply-To: john@wsl.ie (John Allen on wsl)
Organization: Workhorse Systems, Dublin, Ireland
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In article <483@schaefer.MATH.WISC.EDU> wayne@schaefer.MATH.WISC.EDU (Rick Wayne) writes:
>we've run into a little problem here that i find baffling.  we're trying to
>determine the number of disk drives on a machine at runtime.  there's a DOS
>interrupt service for this: interrupt 0x21, function 0x0E, "set default
>disk drive".  it's supposed to return the number of drives in the system.
>

Try putting the following line in your config.sys and watch the magic
number 5 change completely under your control.

lastdrive=z
lastdrive=p

etc....

By the way the default is lastdrive=e, does this give you any clues.