fxl@AIDS-UNIX (Franz Lanzinger) (02/24/86)
Regarding the access to the 520 ST RAM bitmap: The 32K bitmap sits on the bus, and can be anywhere in physical memory, as long as it aligned with a 256 byte boundary. There are BIOS (or is that XBIOS) routines to set and get the addresses of both the physical and the logical screen. This makes it possible to do double buffering using their (or your own) graphics routines. You could even do this in BASIC using peek and poke, though this approach is probably not fast enough to bother with. Franz Lanzinger (fxl@aids-unix) phone: (415) 941-3912
wrd@tekigm2.UUCP (Bill Dippert) (02/25/86)
In article <8602241936.AA21595@ucbvax.berkeley.edu>, fxl@AIDS-UNIX (Franz Lanzinger) writes: > Regarding the access to the 520 ST RAM bitmap: > > The 32K bitmap sits on the bus, and can be anywhere in physical > memory, as long as it aligned with a 256 byte boundary. There are > BIOS (or is that XBIOS) routines to set and get the addresses of both > the physical and the logical screen. This makes it possible to do > double buffering using their (or your own) graphics routines. You > could even do this in BASIC using peek and poke, though this approach > is probably not fast enough to bother with. > > Franz Lanzinger (fxl@aids-unix) > phone: (415) 941-3912 NO! NO! NO! This is net.atari8 for the 800/400/1200XL/800XL/600XL/130XE 8 bit computer line of Atari. We do not know or care about the 16 bit line of computers (520ST, 1045ST, etc.). Please post ST questions to net.micro.atari16!!!!! It took a long time to split the groups, now use them properly! Grhhhhh!!!!! --Bill--