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From: 2212msr@whuts.UUCP
Newsgroups: comp.sys.ibm.pc,comp.sys.att
Subject: MASM Int 25h on PC AT
Message-ID: <2232@whuts.UUCP>
Date: Sat, 20-Jun-87 21:23:37 EDT
Article-I.D.: whuts.2232
Posted: Sat Jun 20 21:23:37 1987
Date-Received: Fri, 26-Jun-87 01:35:48 EDT
Organization: AT&T Bell Laboratories
Lines: 20
Keywords: disk drive empty detect MASM
Xref: utgpu comp.sys.ibm.pc:4395 comp.sys.att:515


On a PC or XT an Int 13h,function 04h can be used to determine if there is a 
disk in a drive.  This does not work on an AT (or clone).  Can anyone suggest a
workaround or alternative solution?

I'm currently issueing a Int 25h (sector read), which works on all machines
The problem I'm having is the case where a program is running on a machine
with a single floppy drive and (apparently) COMMAND.COM causes a message  
to the effect..Insert Diskette in Drive A/B: .. Press Enter ...
How can I supress this message?  Does anyone know any way around this
problem.  (The machines where I encounter this problem most frequently
are AT&T PC-6300s.  It is possible that this is a result of AT&T's brain
damaged MS-DOS - after all these are the people who changed DOS 3.1 to yield
8K clusters on 30Mb hard disks!)

Max S. Robin                           DISCLAIMER:I speak only for myself
AT&T Bell Laboratories                            and no one else
Whippany, NJ
email:whuts!2212msr
voice:201-386-6