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From: rdas@hatter.Tops.Sun.COM (Robin Das)
Newsgroups: comp.sys.ibm.pc
Subject: Undocumented modes in DOS4.01
Message-ID: <654@suntops.Tops.Sun.COM>
Date: 29 Aug 89 18:45:36 GMT
Sender: news@suntops.Tops.Sun.COM
Reply-To: rdas@hatter.Tops.Sun.COM (Robin Das)
Organization: Sun Microsystems, Inc.  Mt. View, Ca.
Lines: 14

Does anyone know what the modes 2 & 4 (in the al reg.) are for DOS 
function 57H.  0 is for getting the date&time. 1 is for setting it.
DOS 4.01 seems to also use modes 2 & 4!!  It seems to be using the
unknown modes to get some information.  Perhaps it is a different format
or something???  

I am personally sick and tired of IBM/Microsoft using undocumented
calls.  It makes it nearly impossible to write things like network file
systems.

While I'm at it, can someone list the differences between DOS 3.x and
DOS 4.x?  I already know about the extended open call.

Thanx VERY much in advance.