mkl@nw.com (Mark Lottor) (06/26/90)
Hi. I recently bought a p.c.board set for the arcade game Defender and I'm
trying to get it hooked up but I don't know much about color tv workings.
I'd like to hook it up to a color tv (thru the composite video input
on my VCR). For the video it has the following outputs:
R, G, and B: analog, vary from about 0-3vdc
Sync signals: TTL levels
Vert. Sync: a 60hz signal (positive pulse about every 17ms, 0.8ms wide)
Horiz Sync: a positive pulse about every 18usec, about 2usec wide
Composite sync: combo of H and V
Is there some standard for video game monitors? Can I run this thru
an MC1377 RGB to NTSC converter, or will things not work because it
doesn't have the proper scan rate as normal TV? If so, how close do
you need to be for a normal TV to sync up? Otherwise, what else
could I use as a monitor? (I could go to an arcade parts place and
pick up a proper RGB monitor for about $200). Can I use one of those
IBM/PC multisync monitors instead (then I could use it for more than
just the video game)?
Any help appreciated...Markphil@pepsi.amd.com (Phil Ngai) (06/27/90)
In article <2686d1ca@nw.com> mkl@nw.com (Mark Lottor) writes: | R, G, and B: analog, vary from about 0-3vdc | Sync signals: TTL levels | Vert. Sync: a 60hz signal (positive pulse about every 17ms, 0.8ms wide) | Horiz Sync: a positive pulse about every 18usec, about 2usec wide | Composite sync: combo of H and V 18 us -> 55.5 Khz. Forget displaying that on your TV. -- Phil Ngai, phil@amd.com {uunet,decwrl,ucbvax}!amdcad!phil Separate but equal: Bad for blacks, good for women.
myers@hpfcdj.HP.COM (Bob Myers) (06/28/90)
>Hi. I recently bought a p.c.board set for the arcade game Defender and I'm >trying to get it hooked up but I don't know much about color tv workings. >I'd like to hook it up to a color tv (thru the composite video input >on my VCR). For the video it has the following outputs: > > R, G, and B: analog, vary from about 0-3vdc > Sync signals: TTL levels > Vert. Sync: a 60hz signal (positive pulse about every 17ms, 0.8ms wide) > Horiz Sync: a positive pulse about every 18usec, about 2usec wide > Composite sync: combo of H and V You can't do it. Assuming that your horiz. sync really does have a period of 18 us, this board wants a display with a 55.56 kHz horizontal sweep capability, which is far beyond what conventional televisions do. You might be able to run this to one of the newer "multisync" monitors, assuming that you can get a model which will run on TTL sync and handle this rate. Off the top of my head, I'd look at the Mitsubishi line. You'll also need to attenuate the video, as most commercially-available monitors expect RS-343 levels - which give 1V p-p on green and about 0.7V p-p on red and blue. 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.
mkl@nw.com (Mark Lottor) (06/28/90)
After getting a number of replies about how high the scan rate was for my video game board, I decided to recheck things on my scope. This time I got much nicer results! Vertical sync was 60Hz and Horizontal was 15,750Hz. Just what NTSC uses. Now the question is, how do I know if the signal is interlaced or not without trying it out? Is there some way to tell?
jack@focsys.uucp (Jack Houde) (06/28/90)
In article <26898b37@nw.com> mkl@nw.com (Mark Lottor) writes: >how do I know if the signal is interlaced or not without trying it >out? Is there some way to tell? The best way to tell is to look at the last line of video in each of the fields. In one field the last line will be 64 usec long whereas the other field will be 32 usec. If your scope is equipped with video trigerring, this will be a snap, if not, try to get two fields on the screen and then use the delay to hunt around.
mcintyre@turing.cs.rpi.edu (David McIntyre) (06/29/90)
mkl@nw.com (Mark Lottor) writes: >After getting a number of replies about how high the scan rate was >for my video game board, I decided to recheck things on my scope. >This time I got much nicer results! Vertical sync was 60Hz and >Horizontal was 15,750Hz. Just what NTSC uses. Now the question is, >how do I know if the signal is interlaced or not without trying it >out? Is there some way to tell? This seems to be getting very complicated. Why don't you do what the pro's do?? Buy a game cabinet/power supply/monitor combo from a distributor. He'll have games that are not very popular, and which have controls appropriate for your defender game. I bet you could get a case for $200 or less, which is less than you're going to pay for some fancy monitor. Look in your phone book, find a game distributor, and tell him you have a board for defender and you need a cabinet. I bet he'd love to set you up. -Dave Dave "mr question" McIntyre | "....say you're thinking about a plate mcintyre@turing.cs.rpi.edu | of shrimp.....and someone says to office : 518-276-8633 | you 'plate,' or 'shrimp'......"
myers@hpfcdj.HP.COM (Bob Myers) (06/30/90)
>After getting a number of replies about how high the scan rate was >for my video game board, I decided to recheck things on my scope. >This time I got much nicer results! Vertical sync was 60Hz and >Horizontal was 15,750Hz. Just what NTSC uses. Now the question is, >how do I know if the signal is interlaced or not without trying it >out? Is there some way to tell? The method already presented is fine; however, if it's using these frequencies, it's almost undoubtedly interlaced. (15.75 kHz at 60Hz NON-interlaced would only be about 260 lines). Bob Myers KC0EW HP Graphics Tech. Div.| Opinions expressed here are not Ft. Collins, Colorado | those of my employer or any other myers%hpfcla@hplabs.hp.com | sentient life-form on this planet.
jimc@isc-br.ISC-BR.COM (Jim Cathey) (07/03/90)
In article <17660080@hpfcdj.HP.COM> myers@hpfcdj.HP.COM (Bob Myers) writes: >...the video, as most commercially-available monitors expect RS-343 levels - >which give 1V p-p on green and about 0.7V p-p on red and blue. To clarify, the 1V on green is because RS-343 specifies sync on green. The green _video_ signal is (more or less) the same amplitude as red or blue, namely 0.7V p-p, the sync level is about 0.3V negative w.r.t. black. If the monitor has separate sync, then green should only need 0.7V p-p.
bill@vrdxhq.verdix.com (William Spencer) (07/11/90)
in article <WFK$V'%@rpi.edu>, mcintyre@turing.cs.rpi.edu (David McIntyre) says: > Buy a game cabinet/power supply/monitor combo from a distributor. He'll > have games that are not very popular, and which have controls appropriate > for your defender game. I bet you could get a case for $200 or less, > which is less than you're going to pay for some fancy monitor. You can also get a real Defenders machine for this price. One note: the change machines are aften removed. Since this door is used for access to certain bolts used for maintainance this is _very_ bad. bill S.