Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site floyd.UUCP
Path: utzoo!linus!philabs!seismo!harpo!floyd!gjw
From: gjw@floyd.UUCP (Greg Wroclawski)
Newsgroups: net.micro
Subject: Tandy 2000 color graphics
Message-ID: <2030@floyd.UUCP>
Date: Thu, 15-Dec-83 14:26:20 EST
Article-I.D.: floyd.2030
Posted: Thu Dec 15 14:26:20 1983
Date-Received: Sat, 17-Dec-83 02:49:36 EST
Organization: Bell Labs Whippany NJ
Lines: 11


	I have a hard time beleiving that the tandy 2000 graphics capabilities
are as stated in several articles on the net. Full 8 color
resolution at 640x400 pixels would require 3 bits of memory for each pixel.
640x400x3=768000 bits of bit mapped display memory. Dividing by 8 shows that
96000 bytes of memory are required. I would believe that full 8 color graphics
has far less resolution than the 640x400. Note that the IBM PC 's highest 
resolution 640x200 graphics mode is only two color(foreground and background).
This only requires 128000 bits or 16000 bytes of bit mapped display memory.
The only way simultaneous use of 8 colors is possible at the tandy's resolution 
is if bit mapped character display blocks are used ala TI's 9918 Video Display
Controller. This limits the specification of colors of adjacent pixels.