root@sbcs.UUCP (SBCS Systems Staff) (08/09/85)
We are on the market for a color monitor with the following characteristics: o 720 pixel x 400-600 line resolution. o 60 Hz vert freq, ~28-40 Khz horiz freq, 40 Mhz BW. o 12-14 inch diagonal measure screen, .31mm pitch phosphor. o Analog RGB input, need not be linear. Prefer ~1 Volt input. o Low cost (<$1600). Any suggestions? Thanks, Rick Spanbauer SUNY/Stony Brook
larry@kitty.UUCP (Larry Lippman) (08/11/85)
> We are on the market for a color monitor with the > following characteristics: > o 720 pixel x 400-600 line resolution. > o 60 Hz vert freq, ~28-40 Khz horiz freq, 40 Mhz BW. > o 12-14 inch diagonal measure screen, .31mm pitch phosphor. > o Analog RGB input, need not be linear. Prefer ~1 Volt input. > o Low cost (<$1600). > Any suggestions? I am taking your specifications literally, and am being primarily guided by your 28-40 KHz horizontal scan rate. That is the killer. There are no inexpensive raster scan color displays that will operate in that frequency range. I know - I have looked! The least expensive monitor I could find was a Conrac 7211RS19 which set us back about $ 3.9K a year ago. The 7211 gives 1080 horizontal by 809 vertical pixels for a 1225 line resolution. That is more resolution than you asked for - and was also more than we required. However, we had some graphics hardware that would *only* work at 31 KHz. There seems to be a whole order of magnitude price jump when one goes that high in horizontal scan rate. I am not certain why that is, since the monitor circuitry is not that much more complex than that of NTSC monitors. If someone knows of a raster scan monitor meeting the above specs for less than even $ 3K please let me know, too! +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Larry Lippman @ Recognition Research Corp., Clarence, New York | | UUCP {decvax,dual,rocksanne,rocksvax,watmath}!sunybcs!kitty!larry | | {rice,shell}!baylor!/ | | VOICE 716/741-9185 syr!buf!/ | | TELEX {via WUI} 69-71461 ansbak: ELGECOMCLR | | | | "Have you hugged your cat today?" | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
skinner@saber.UUCP (Robert Skinner) (08/20/85)
> > We are on the market for a color monitor with the > > following characteristics: > > o 720 pixel x 400-600 line resolution. > > o 60 Hz vert freq, ~28-40 Khz horiz freq, 40 Mhz BW. > > o 12-14 inch diagonal measure screen, .31mm pitch phosphor. > > o Analog RGB input, need not be linear. Prefer ~1 Volt input. > > o Low cost (<$1600). > > Any suggestions? > > are no inexpensive raster scan color displays that will operate in that > frequency range. I know - I have looked! The least expensive monitor I > could find was a Conrac 7211RS19 which set us back about $ 3.9K a year ago. > The 7211 gives 1080 horizontal by 809 vertical pixels for a 1225 line > resolution. That is more resolution than you asked for - and was also more > than we required. However, we had some graphics hardware that would *only* > work at 31 KHz. > There seems to be a whole order of magnitude price jump when one > goes that high in horizontal scan rate. I am not certain why that is, since > the monitor circuitry is not that much more complex than that of NTSC monitors. Here's a simple formula for the horizontal scan frequency required for a given resolution: (horiz. freq) = (vert. res.)x(refresh rate)x(1. + % scan interval) This should be fairly obvious, the beam will trace a horizontal line once for each vertical line, 60 or 30 times a second, plus a small percentage to allow for vertical retrace time (5-10%). So, what the original poster needed was about (400-600) x 60 x (1.05-1.10) = 25.2 - 39.6 KHz. He will probably find something acceptable at about 31.5KHz, since that is the RS-170 standard (2x NTSC). I don't know the prices, but I'm sure they aren't as high as $3.9K. 31.5KHz isn't that state of the art, high res monitors have to support 60-80KHz. As far as the second poster goes, How do you get 1225 lines out of a monitor with 809 line resolution? Besides, if I take your numbers and solve the above equation for the refresh rate, I get less than 27Hz (bad flicker). I hate to say it, but I think Conrac sold you a bill of goods. ------------------------------------------------------------------------------ .. man then went on to prove that black was white, and was promptly killed at the next zebra crossing. Name: Robert Skinner Snail: Saber Technology, 2381 Bering Drive, San Jose, California 95131 AT&T: (408) 945-0518, or 945-9600 (mesg. only) UUCP: ...{decvax,ucbvax}!decwrl!saber!skinner ...{amd,ihnp4,ittvax}!saber!skinner