mt87692@tut.fi (Mikko Tsokkinen) (05/25/90)
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! > this because that's the fasted memory in standart 512k machine. All alloc- > mems fail. I think I will kick the operating system out, move low 16k > somewhere and when the program has ended move it back. Somebody said that > it contains some track.device buffer but that doesn't matter, I'm using > my own disk-routines anyway. Any other solutions? I need the speed for > real time 3D landscape & object handling. MITT -- ----------------------------------------------------------------------- : Mikko Tsokkinen : I'm not a number ... I'm a free man : : Internet mt87692@tut.fi : UUCP tut!mt87692 : Bitnet mt87692@fintut : -----------------------------------------------------------------------
jesup@cbmvax.commodore.com (Randell Jesup) (05/26/90)
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!"