Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!dimacs.rutgers.edu!rutgers!cbmvax!daveh From: daveh@cbmvax.commodore.com (Dave Haynie) Newsgroups: comp.sys.amiga.hardware Subject: Re: 68030+68040 on A3000: is it possible? Message-ID: <21515@cbmvax.commodore.com> Date: 13 May 91 18:16:56 GMT References: <24561@well.sf.ca.us> <15543@life.ai.mit.edu> <18991@sdcc6.ucsd.edu> <21302@cbmvax.commodore.com> <62063@masscomp.westford.ccur.com> Reply-To: daveh@cbmvax.commodore.com (Dave Haynie) Distribution: comp Organization: Commodore, West Chester, PA Lines: 35 In article <62063@masscomp.westford.ccur.com> mark@calvin.westford.ccur.com (Mark Thompson) writes: >In article <21302@cbmvax.commodore.com> daveh@cbmvax.commodore.com (Dave Haynie) writes: >>Incidently, the Toaster's display kicks out full NTSC overscan at something >>like 1500x960 pixels. >Actually, it outputs 768 x 482 which is the maximum resolution NTSC can >handle (anything greater would have to be thrown away). Well, I'm no NTSC wiz, but technically, at least on the horizontal, NTSC is analog. There are no such things as pixels, per se. An NTSC TV can't resolve individual pixels at 1500 or so across, but it can resolve the differences between pixel changes at higher-than-70ns rates (you get 70ns pixels out of a computer generating 768 across in full overscan). For example, fire up your favorite titling program in hires, draw some simple letters, and note the jaggies. Then kick that into "superhires" mode (if you have an ECS machine), draw something that looks the same, and note the relative absense of jaggies. You'll see the same effect on TV. That's the reason that cable TV and local commercials done on the Amiga have jaggies in their titling, and the titles on Wide World of Sports or similar network shows don't have any jaggies. Real high end machines may give you 2000 pixels across. You can't resolve individual pixels at that rate, but you can resolve changes. As for the Toaster, I don't know what it really kicks out. Some of my video buddies mentioned 1500x960, and I figured it was at least spitting out a real 1500 pixels on the horizontal. If not, you'll be able to do better looking titles on an ECS system, at least until the Toaster kicks in some antialiasing (my guess is that 768 dots with full NTSC color palette and good antialiasing would make cleaner looking letters than 1500 with three colors). >% ` ' Mark Thompson CONCURRENT COMPUTER % -- Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy "That's me in the corner, that's me in the spotlight" -R.E.M.