Article View: comp.sys.atari.st
Article #28013Color Confusion
From: MacDonald.pa
Date: Mon, 24 Aug 1987 19:16
Date: Mon, 24 Aug 1987 19:16
23 lines
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1446 bytes
I'm writing some MIDI controlled graphics in Forth. I have rudimentary access to A-line, VDI, AES and xbios. I have read Internals and Gem Programmers Reference but I do not understand how color actually works in the ST. I would like to use the A-line commands but... What does the term PLANE actually mean? I can only figure that you use 4 32bit words to describe 4 bits. If you use Setpallette from xbios why does the example indicate 18 words to describe 16 colors? Are these other words commands? The A-line description of color/resolution says something about an inverse video command in color palette register 0??? xbios talks about colors having values between $000 and $777 with 777 being white, VDI/AES talk about 1000 levels each of R,G, and B. What's the story here. I would be happy to summarize responses to keep digest traffic down. Thanks, Dale. ARPA: <MacDonald.pa@Xerox.COM>
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!husc6!cmcl2!rutgers!sri-spam!ames!ucbcad!ucbvax!XEROX.COM!MacDonald.pa From: MacDonald.pa@XEROX.COM Newsgroups: comp.sys.atari.st Subject: Color Confusion Message-ID: <870824-121641-7661@Xerox> Date: Mon, 24-Aug-87 15:16:00 EDT Article-I.D.: Xerox.870824-121641-7661 Posted: Mon Aug 24 15:16:00 1987 Date-Received: Tue, 25-Aug-87 06:07:03 EDT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The ARPA Internet Lines: 23