Path: 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> Reply-To: jesup@cbmvax (Randell Jesup) Organization: Commodore, West Chester, PA Lines: 19 In article 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!"