towson%amsaa@sri-unix.UUCP (11/23/83)
From: David Towson (CSD) <towson@amsaa> Right on! I put together an IBM-PC with 256K memory, a pair of 360K drives, the color graphics adapter and a surplus 19" Conrac color monitor for $3000 including DOS 2.0 and the Technical Reference Manual. The only problem I had was that in addition to the R, G and B color signals I also had to use the intensity signal from the color graphics adapter if I wanted to have the full "sixteen colors" (actually two intensities of each color). The standard color monitor didn't have an intensity input, so I had to make one using three resistive summing networks - simple, but effective. I also needed a composite sync signal, which is generated on the color graphics board, but is not brought out on the rear connector. I brought it out on pin 7, which was unused. It works fine, and I could not possibly have gotten this much PC any other way. I decided to go with a "real PC" because I didn't want to make a career out of doing compatibility analyses on the various PC clones. Dave