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From: bc@cyb-eng.UUCP (Bill Crews)
Newsgroups: net.micro.pc
Subject: Re: Undocumented DOS Interrupts
Message-ID: <838@cyb-eng.UUCP>
Date: Tue, 13-May-86 15:54:29 EDT
Article-I.D.: cyb-eng.838
Posted: Tue May 13 15:54:29 1986
Date-Received: Thu, 15-May-86 05:40:41 EDT
References: <1310@umcp-cs.UUCP> <15200022@hpcvlo.UUCP>
Organization: Cyb Systems, Austin, TX
Lines: 19

> I'm not sure of the exact purpose of Int 2Ah, but it appears to be somehow
> used by our HP OfficeShare network software.  When I boot up my AT (3.2) 
> without the network stuff, Int 2Ah points to an IRET.  With the network
> installed, it points at CMP AH,0 / JNZ / MOV AH,1 / IRET / etc.
> 
> More information, anyone?
> 
> Bill Frolik

int 2Ah is the DOS way to access NETBIOS.  It doesn't seem to me to be that
useful, however, since the caller has to formulate a NETBIOS request and
pass its address.  One could do the same thing and just issue int 5Ch, but
some other DOS machine may use something other than 5Ch in its BIOS.  As
far as I can tell, the request is just forwarded directly to 5Ch without
interpretation by DOS.
-- 
	- bc -

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