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
copp@petrus.UUCP (08/30/85)
I think that the French TV standard is higher res than NTSC. Is it possible that one could bend a French TV monitor to fit your requirements?
brown@nicmad.UUCP (09/01/85)
In article <5400003@petrus.UUCP> copp@petrus.UUCP writes: >I think that the French TV standard is higher res than NTSC. >Is it possible that one could bend a French TV monitor to fit >your requirements? Yes or No. If it is a RGB monitor, maybe. If it is for broadcast images, it won't be purely RGB. If it is for broadcast images and doesn't have an RGB input, no, it can't be used, as it is fed with the SECAM color system. -- Mr. Video {seismo!uwvax!|!decvax|!ihnp4}!nicmad!brown