Article View: comp.sys.amiga.tech
Article #3587Re: Speed vs Multitasking (WAS: Low 16k memory)
From: Randell Jesup
Date: Fri, 25 May 1990 18:28
Date: Fri, 25 May 1990 18:28
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1493 bytes
In article <MT87692.90May25115813@uikku.tut.fi> mt87692@tut.fi (Mikko Tsokkinen) writes:
>In article <1623@lpami.wimsey.bc.ca> lphillips@lpami.wimsey.bc.ca (Larry Phillips) writes:
>
>> Has somebody checked what low 16k ($0000-$ffff) memory contains. I'm asking
> ^^^^^^^
> Because of brain damage I wrote 16k when I ment 64k! To be more precise
>first 32k and last 32k. The Idea is to use short absolute addressing which
>is actyally quite a bit faster than long!
Yes, it's somewhat faster, but on a 68000, d16(An) is just as fast
and small as Abs.W addressing. Just set up a base register, and you can make
ANY 64K you want "fast". And this way, you can cooperate with the OS, instead
of being nasty to other programs and users (and perhaps breaking in unexpected
configurations).
--
Randell Jesup, Keeper of AmigaDos, Commodore Engineering.
{uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.cbm.commodore.com BIX: rjesup
Common phrase heard at Amiga Devcon '89: "It's in there!"
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uunet!cbmvax!jesup From: jesup@cbmvax.commodore.com (Randell Jesup) Newsgroups: comp.sys.amiga.tech Subject: Re: Speed vs Multitasking (WAS: Low 16k memory) Message-ID: <11804@cbmvax.commodore.com> Date: 25 May 90 18:28:40 GMT References: <1623@lpami.wimsey.bc.ca> <MT87692.90May25115813@uikku.tut.fi> Reply-To: jesup@cbmvax (Randell Jesup) Organization: Commodore, West Chester, PA Lines: 19