mfriedel@slate.mines.colorado.edu (Friedel Michael) (05/02/91)
>There is a CLUT in the color slabs, but to answer the first question >you need to know if the chip has three 16x8 rams or one 4Kx24 ram to >feed the three 8 bit D/A converters. This determines if the machine >is capable of 16 or 256 shades of gray. > >Even if it is 4Kx24, the answer to the second question is no. So an >answer to the first question is needed before hacking away at how to >get around the restrictions and answer question three. > >Mark Adler > madler@pooh.caltech.edu The RAMDAC has 16x8bit for every DAC, it is a Bt463, the basic implementation is [VRAM] 4bit -> [Color palette (16 x 8 bit)] 8bits -> [DAC] -> video for every channel (that is green, red and blue). Mike P.S. Does anybody have anymore specs on a Bt463, like max resolution, how to adress the color palettes ..... -- /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ No user serviceable part inside. Warranty void if opened modified or tampered with. No batteries included. *
madler@nntp-server.caltech.edu (Mark Adler) (05/02/91)
Michael Friedel found out: >> The RAMDAC has 16x8bit for every DAC, it is a Bt463, the basic implementation >> is >> [VRAM] 4bit -> [Color palette (16 x 8 bit)] 8bits -> [DAC] -> video >> >> for every channel (that is green, red and blue). Too bad. That settles it. The color slabs cannot display more than 16 shades of gray (per pixel). Mark Adler madler@pooh.caltech.edu