cmcmanis@sun.UUCP (01/16/87)
Allan, or anyone else that has seen the "real" blitter documentation I would love to hear what it can do. Specifically, things like How many bits at a time does it manipulate? What kind of operations can it do (OR, AND, XOR, CPL, ADD?, SUB? CMP?, etc) Does it handle overlapping rectangles automatically? Or does one have to break them up? 'frinstance blitting the rectangle from (a,b) to the rectangle at (a1,b1). (a,b) +---------------------+ | (a1,b1) | | +---------------------+ | | | +-----------| | | | +---------------------+ Does it do masked blits? How many sources can it address (terms in the logical equation) and does the destination count as one term? How fast is it (pixels/sec) and does it completely steal the bus from the 68K or does it "cycle steal". Does it have any memory restrictions like the Amiga (lower 512K only) and what is the largest bitmap that it can blit into? Thanks for any answers to any of the above questions. -- --Chuck McManis uucp: {anywhere}!sun!cmcmanis BIX: cmcmanis ARPAnet: cmcmanis@sun.com These opinions are my own and no one elses, but you knew that didn't you.
apratt@atari.UUCP (Allan Pratt) (01/19/87)
I can't give any blitter specifics because I don't know any. Besides that, it is a custom VLSI part and some of its details are still subject to change. Please wait for an official Atari announcement -- I'm sorry I can't be more helpful. Mainly, though, it does most of what you would expect a blitter to do. I think it does almost everything you can do with the line-A blt, and more, but (of course) in hardware, not software. /----------------------------------------------\ | Opinions expressed above do not necessarily | -- Allan Pratt, Atari Corp. | reflect those of Atari Corp. or anyone else. | ...lll-lcc!atari!apratt \----------------------------------------------/