ctne_ltd@uhura.cc.rochester.edu (Chris Newbold) (10/29/89)
I'm reposting this request because I remember reading something about
someone accidentally deleting the first message, and a lack of response (for
the same reason, I assume).
I'm looking for a way to convert NTSC video (like a VCR video out) to
RGB and sync to drive an analog monitor (like an IBM PS/2 screen).
Any suggestions or recommendations are appriciated.
--
>>>> Chris Newbold <<<< * "If you fool around with a thing for very long you *
University of Rochester * will screw it up." *
Disclaimer: "All warranties expire upon payment of invoice."
ctne_ltd@uhura.cc.rochester.edu * uhura.cc.rochester.edu!ctne_ltd@uunetmyers@hpfcdj.HP.COM (Bob Myers) (10/31/89)
>I'm looking for a way to convert NTSC video (like a VCR video out) to >RGB and sync to drive an analog monitor (like an IBM PS/2 screen). >Any suggestions or recommendations are appriciated. Chips which decode NTSC-encoded color video into RGB and sync are available from a number of sources; check out a recent Motorola "Linear and Interface ICs" databook for several. However, you're likely to run into a problem with timing - standard NTSC video is a 15.734 kHz-horizontal, interlaced format, and nearly all monitors intended for computer use - including those in the PS/2 line - are intended for considerably higher rates. Thus, even if you get the RGB and sync signals sorted out, the monitor still won't like 'em. (Yes, there are ways to put NTSC video on a computer display - but they're not easy/cheap, at least compared to what I think you want here.) Bob Myers KC0EW HP Graphics Tech. Div.| Opinions expressed here are not Ft. Collins, Colorado | those of my employer or any other myers%hpfcla@hplabs.hp.com | sentient life-form on this planet.
ctne_ltd@uhura.cc.rochester.edu (Chris Newbold) (11/02/89)
In article <17660028@hpfcdj.HP.COM> myers@hpfcdj.HP.COM (Bob Myers) writes: >ICs" databook for several. However, you're likely to run into a problem with >timing - standard NTSC video is a 15.734 kHz-horizontal, interlaced format, >and nearly all monitors intended for computer use - including those in the >PS/2 line - are intended for considerably higher rates. Thus, even if you How about an NEC Multisync? Would that be able to get down to 15kHz? I don't have the specs for mine handy, but it seems plausible. -- >>>> Chris Newbold <<<< * "If you fool around with a thing for very long you * University of Rochester * will screw it up." * Disclaimer: "All warranties expire upon payment of invoice." ctne_ltd@uhura.cc.rochester.edu * uhura.cc.rochester.edu!ctne_ltd@uunet
myers@hpfcdj.HP.COM (Bob Myers) (11/04/89)
Hmmm. I can't find my NEC files right now, but my somewhat-rusty memory
says that the NEC multisync is good for 15 - 35 kHz horizontal. Should work.
Bob Myers KC0EW HP Graphics Tech. Div.| Opinions expressed here are not
Ft. Collins, Colorado | those of my employer or any other
myers%hpfcla@hplabs.hp.com | sentient life-form on this planet.jimc@isc-br.ISCS.COM (Jim Cathey) (11/07/89)
In article <3699@ur-cc.UUCP> ctne_ltd@uhura.cc.rochester.edu (Chris Newbold) writes: >In article <17660028@hpfcdj.HP.COM> myers@hpfcdj.HP.COM (Bob Myers) writes: >>ICs" databook for several. However, you're likely to run into a problem w/ >>timing - standard NTSC video is a 15.734 kHz-horizontal, interlaced format, >>and nearly all monitors intended for computer use - including those in the >>PS/2 line - are intended for considerably higher rates. Thus, even if you >How about an NEC Multisync? Would that be able to get down to 15kHz? I >don't have the specs for mine handy, but it seems plausible. Any monitor rated for CGA operation can do 15+ kHz horizontal, but interlaced might be another story. At least the early versions of the NEC Multisync _will not do_ interlace! They synchronized (internally) the VSYNC signal with the HSYNC signal, whick kills interlace. +----------------+ ! II CCCCCC ! Jim Cathey ! II SSSSCC ! ISC-Bunker Ramo ! II CC ! TAF-C8; Spokane, WA 99220 ! IISSSS CC ! UUCP: uunet!iscuva!jimc (jimc@iscuva.iscs.com) ! II CCCCCC ! (509) 927-5757 +----------------+ "With excitement like this, who is needing enemas?"