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- Path: sparky!uunet!cis.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!cleveland.Freenet.Edu!aa399
- From: aa399@cleveland.Freenet.Edu (Len Stys)
- Newsgroups: comp.sys.atari.st
- Subject: Re: Blitter - what does it do besides bitcopy?
- Date: 24 Dec 1992 03:40:27 GMT
- Organization: Case Western Reserve University, Cleveland, OH (USA)
- Lines: 138
- Message-ID: <1hbbfbINNqvm@usenet.INS.CWRU.Edu>
- References: <1992Dec24.010027.14742@elroy.jpl.nasa.gov> <1gvg4tINNqmm@usenet.INS.CWRU.Edu>
- Reply-To: aa399@cleveland.Freenet.Edu (Len Stys)
- NNTP-Posting-Host: thor.ins.cwru.edu
-
-
- In a previous article, hyc@hanauma.jpl.nasa.gov (Howard Chu) says:
-
- >In article <1gvg4tINNqmm@usenet.INS.CWRU.Edu> aa399@cleveland.Freenet.Edu (Len Stys) writes:
- >>
- >>Which chip is responsible for the STe's hardware scrolling?
- >
- >The video shifter chip. All of the STe shifter's capabilities are also
- >present in the Falcon's video chip.
-
- There wouldn't be anything else included in the Falcon's video chip
- such as scaling or rotation?
-
- >>
- >>Most other game systems use a very fast graphics chip to take care of
- >>the sprites, scaling, scrolling, etc.
- >
- >The blitter does fine for sprite manipulation. I think it also serves for
- >scaling (but not certain there). Scrolling is already handled by the video
- >chip.
-
- I realize that scrolling is, but how can we find out if scaling, rotation,
- and other things have been added to the video chip?
-
- Maybe I'm concerned about something that the Falcon might already have.
-
- >>
- >>My question is: If ATARI is interested in making this system a competitor
- >>in the computer entertainment market, why didn't Atari include one?
- >
- >The Falcon is a home computer that also can play games, not a game system
- >that happens to contain a computer. Different emphasis, I'd say.
-
- Hmm, but HOME computers are regulary used to play games.
- And it would definitely be a bonus if it could really play some kick-butt
- games...
-
- Dad does work at home (types up letters, does his income tax, accounting, etc.),
- Mom keeps a phone list and does other things similar to dad.
-
- And what do kids do? Which usually out number the parents?
-
- They MIGHT type up their papers, but I bet that they play games more
- than anything.
-
- And is there any chance that Dad or Mom will play any games? Certainly.
-
- Entertainment should be a major issue for HOME computers.
-
- >>
- >>The SNES has a CPU speed of 3.58 MHz! Everyone looked at this speed
- >>and laughed, but the graphics chip showed that the speed of the processor
- >>did not matter too much at all.
- >
- >Well, a 6502 (er, 65816) is a pretty efficient chip, as microprocessors go.
- >Almost all its instructions execute in a single clock cycle. In contrast,
- >the fastest 68000 instructions all take 4 clock cycles, and the average
- >cycle time is out around 6 cycles. Given this disparity, it's plain to see
- >that clock speed alone isn't enough to judge anything, and anyone who looks
- >solely at speeds to judge systems is an outright fool.
-
-
-
- Tell me that a CPU running at 3.58 MHz could be fast enough without
- any help from that graphics coprocessor inside...
-
- I don't think so Tim! :)
-
- >
- >>The Sega Genesis is based on a 68000 CPU at the speed of 7.6 MHz.
- >>This system pretty much relies on the programmer for rotation, etc.
- >>BUT I'm pretty sure it still has a graphics chip. And I'm POSITIVE
- >>that the Sega CD-ROM player has an especially designed graphics chip
- >>for rotation.
- >>
- >>Recently, Nintendo announced to the world that it has developed a graphics
- >>chip that will be powerful enough for 3-D imaging.
- >>
- >>If the Falcon030 does NOT have a graphics chip that is responsible for
- >>these features, won't the video game systems pass this system by?
- >
- >Neither the PCs nor the Macs have any hardware-assisted graphics to speak of.
- >I.e., no blitter, no sprite generator, no fine scrolling either vertically or
- >horizontally, very limited video memory constraints. Games are written for
- >these systems all the time. It seems to me that you're being a bit over
- >concerned about one minor detail (especially when there are so many other
- >major details to be concerned about, like, when will the Falcons actually
- >be for sale in the US?)
-
- First of all, the only reason games are written for the PC is because
- there are millions and millions of the out there.
-
- Atari won't have that advantage.
-
- Another thing, Mac games aren't exactly fantastic...
-
- But the Amiga500 (though people will disagree with me) actually put
- Commodore on the map due to everyone buying it for games.
-
- I know three people that bought it mainly for the purpose of
- entertainment even though they also use it for word processing, etc.
-
- I'd say that a home computer's abilities where games are concerned
- is very important.
-
- Though, I can't agree with you more about the shipments of the Falcon030...
-
- WHEN???
-
-
-
- >
- >As a final note, there are already a huge number of arcade shoot-em-up
- >games on the plain ol' ST, which doesn't even have a blitter. Most of them
- >look pretty good. What's the problem?
-
- The problem is that most of them won't work on the STe because they
- "broke the rules"... :)
-
- >>
- >--
- > -- Howard Chu @ Jet Propulsion Laboratory, Pasadena, CA
- >
- >There's a narrow border between genius and insanity, but I'm a dual citizen.
-
- By the way, you said what good would a 64-bit RISC graphics coprocessor
- do anyways?
-
- I'm not sure. I don't think I could imagine what that thing could
- possibly do for the purpose of entertainment, video production, CAD, etc.
-
- But I bet if Atari ever managed to connect a Virtual Reality helmet
- to a system with it, there would be some great times.
-
- >
-
- --
-
-