Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!linus!decvax!duke!mcnc!unc-c!dya From: dya@unc-c.UUCP Newsgroups: net.micro.pc Subject: Re: rqst for monitor opinions - (nf) Message-ID: <1215@unc-c.UUCP> Date: Sat, 28-Jan-84 12:48:01 EST Article-I.D.: unc-c.1215 Posted: Sat Jan 28 12:48:01 1984 Date-Received: Thu, 9-Feb-84 03:04:19 EST Lines: 31 References: uiucdcs.4960 Virtually ALL consumer monitors stink, because their limiting factor is the dot / other triad pitch. The upper frequency limit can be calculated by: ((line length) / (dot pitch * 51 us) ) * sqrt(2.0) Generally, a dot pitch of 0.43 mm is required for satisfactory NTSC performance on a 15 inch screen, while 0.31 is required for a 13 inch screen (including luminance to 4.2 mc/s.) Obviously, for RGB this matters because all three channels have the full video bandwidth. Vectrix's monitor isn't so bad ( $ 1100 ) although I don't know if they will part it out. It has a 0.31 mm dot pitch. There seems to be a big] brouhaha about someone like MGA which boasts an AWESOME 0.43 dot pitch. (This is an improvement, my 9 inch ColourTrak is something like 0.8). The other limiting factor is how many pixels. If you are only doing 128 by 128, then anything will work. Also, dot pitch is meaningless unless your monitor manufacturer can guarantee convergence (especially in the corners.) Needless to say, the RGB should be direct to the cathodes with a minimum of amplification, and aperture correction if possible. --David "Last of the Analog" Anthony { decvax!duke!mcnc!(urp,unc-c)!dya }