home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!spool.mu.edu!olivea!apple!goofy!mumbo.apple.com!gallant.apple.com!jensmac.apple.com!jens_alfke
- From: jens_alfke@gateway.qm.apple.com (Jens Alfke)
- Newsgroups: rec.games.video
- Subject: Re: 16 bit graphics or cpu?
- Message-ID: <1992Dec22.010349.16877@gallant.apple.com>
- Date: 22 Dec 92 01:03:49 GMT
- References: <n1283t@ofa123.fidonet.org>
- Sender: news@gallant.apple.com
- Organization: Apple Computer
- Lines: 25
-
- In article <n1283t@ofa123.fidonet.org> , Scott.Thomas@ofa123.fidonet.org
- writes:
- >Now I want to have one thing answered once and for all, when we talk
- >about the term 16 bit, do we mean graphix capabilites or cpu
- >capabilities? If we were talking graphix then I can say "Yeah the Super
- >Nintendo and the Sega Genesis are both 16 bit systems", or are we talking
- >processors? If we are talking processors then basically if you call the
- >Genesis a 16 bit system you would have to call the Super Nintendo an 8
- >bit system.
-
- Neither has 16-bit graphics, which means 16 bits per pixel, usually
- handled as true color (i.e. no color lookup table) with 5 bits each for
- red, green, blue, and one left over as a mask. This allows 65,536 colors
- on screen simultaneously. It's a form of true color; not quite as nice as
- 32-bit color but uses only half as much RAM and CPU time.
-
- No home video game console comes even close to this. The most you can
- have onscreen at once is 256 colors.
-
- 16-bit processor, yes. Sorta. The 68000 is a 32-bit architecture with a
- 16-bit implementation (all registers are 32 bit, 32-bit arithmetic, 24
- bit addresses; but the data bus is only 16bits wide), whereas the 65816
- is a 16-bit processor based on an 8-bit (6502) design.
-
- --Jens Alfke
-