Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!ucdavis!csusac!mmsac!qmet!sc
From: sc@qmet.UUCP (Steve Croft)
Newsgroups: comp.arch
Subject: Re: PUSH on i8088/i80x86
Message-ID: <830@qmet.UUCP>
Date: 9 Jan 90 16:41:14 GMT
References: <182DAVISTD@MSU> <5524@bd.sei.cmu.edu> <10190@microsoft.UUCP> <5550@bd.sei.cmu.edu>
Organization: Qualimetrics, Inc., Sacramento
Lines: 23

Well, to clear things up...  here is an extract from the Intel iAPX 286
Programmer's Reference Manual 1984, Appendix D (iAPX 86/88 Software
Compatibility Considerations), page D-2:

	8.  Do not Rely on the Value Written by PUSH SP.

	    The iAPX 286 will push a different value on the stack for
	    PUSH SP than the iAPX 86/88.  If the value pushed is
	    important, replace PUSH SP instructions with the
	    following three instructions:
	    PUSH BP
	    MOV  BP,SP
	    XCHG BP,[BP]
	    This code functions as the iAPX 86/88 PUSH SP instruction
	    on the iAPX 286.


Steve
-- 
******************************************************************************
*   If what I say is not correct,    *      Steve Croft, Qualimetrics, Inc.  *
*       then it's not what I meant!  *      (ucbvax!ucdavis!csusac!qmet!sc)  *
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