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From: apratt@atari.UUCP
Newsgroups: comp.os.minix
Subject: Re: Stack Growth Direction
Message-ID: <559@atari.UUCP>
Date: Thu, 12-Feb-87 15:01:41 EST
Article-I.D.: atari.559
Posted: Thu Feb 12 15:01:41 1987
Date-Received: Sat, 14-Feb-87 15:20:20 EST
References: <913@drivax.UUCP>
Organization: Atari Corp., Sunnyvale CA
Lines: 30

in article <913@drivax.UUCP>, alexande@drivax.UUCP (Mark Alexander) says:
> 
> In article <384@dayton.UUCP> joe@dayton.UUCP (Joseph P. Larson) writes:
>>Pre-decrement of SP for a push makes the stack grow up...
> 
> Wrong.
> 
> [citations deleted]

As one who has recently been burned by caustic net postings, I think I
should interject some sympathy and understanding here.

"Up" and "down," "high" and "low" mean different things to different
people.  When drawing a memory map on a page, do you put zero at the
top or at the bottom?  Which way is "up?"  The direction which is "up"
in your mind may be different from "up" in somebody else's.  As long
as we all understand (and I think we do) that stacks on the 808* and
680* use predecrement for "push" and and postincrement for "pop", the
question of "up" and "down" is irrelevent.

Alexander@drivax used one unambiguous phrase ("Pre-decrement") and one
ambiguous one ("up") -- why not give him the benefit of the doubt?
Maybe his mental structure has zero at the top of the page.

Can we put this to rest now?  Counter-flames to /dev/null, please.

/----------------------------------------------\
| Opinions expressed above do not necessarily  |  -- Allan Pratt, Atari Corp.
| reflect those of Atari Corp. or anyone else. |     ...lll-lcc!atari!apratt
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