"Frank Townsend" writes: >The manual actually specifies a "color or TTL monochrome monitor" and >indicates that by "color" it means RGB. >In the setup screens the monitor choices are "color or composite monitor >(640 x 200) and "TTL monochrome monitor (720 x 350)." >My assumption is that RGB means CGA. Is this correct? CGA was certainly 640x200 or 320x200 (depending on how many colors in the palette you wanted [4 or 8 I seem to recall]). CGA is actually RGBI rather than straight RGB as TTL RGB would only give you 8 colors but adding the Intensity bit increases it to 16 (if you include dark white and light black as two different greys). CGA also supported composite output to a TV aux in socket. 720x350 TTL monochome was the MDA and HGC resolution. -- David Wilson School of IT & CS, Uni of Wollongong, Australia In article <40be953e$1@news.uow.edu.au>, David Wilson wrote: >"Frank Townsend" writes: >>The manual actually specifies a "color or TTL monochrome monitor" and >>indicates that by "color" it means RGB. > >>In the setup screens the monitor choices are "color or composite monitor >>(640 x 200) and "TTL monochrome monitor (720 x 350)." > >>My assumption is that RGB means CGA. Is this correct? > >CGA was certainly 640x200 or 320x200 (depending on how many colors in the >palette you wanted [4 or 8 I seem to recall]). CGA is actually RGBI rather >than straight RGB as TTL RGB would only give you 8 colors but adding the >Intensity bit increases it to 16 (if you include dark white and light black >as two different greys). CGA also supported composite output to a TV aux in >socket. > >720x350 TTL monochome was the MDA and HGC resolution. >-- >David Wilson School of IT & CS, Uni of Wollongong, Australia ...and the EGA, which superseded the CGA, was RRGGBB with TWO wires for each primary color R,G,B, providing a total of 4 intensity levels for each primary color yielding a total of 4*4*4=64 possible colors. Yes, the color signals on both the CGA and the EGA was digital, with a "0" or a "1" on each wire. Not until the VGA was genuine RGB introduced in the PC world: the VGA had one wire for each primary R,G,B but the signal on these wires were analog signals which could provide many different intensities for each primary, and as a result millions of possible "colors" on the screen. -- ---------------------------------------------------------------- Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN e-mail: pausch at stockholm dot bostream dot se WWW: http://www.stjarnhimlen.se/ http://home.tiscali.se/pausch/