jacx@homxb.UUCP (J.CADLEY) (04/21/86)
x
I recently received my new 520 ST. It's great. I've got TOS in ROM
and the connector for output to my T.V. I own an old medium res
color monitor which I would like to use with my ST. The monitor
wants composite input. I recall reading in this newsgroup
several weeks ago that composite output would be available
in the new ST's, however there doesn't seem to be any obvious way
to get a composite signal out of my machine.
I noticed in the pinout for the monitor connection that one pin
is for "General Purpose" output. Is this a composite signal?
Do I need a special cable? Does anyone out there understand
how to get a composite signal?
Thanks for your help,
John Cadley
AT&T
Neptune, NJjhs@disunix.UUCP (04/22/86)
This may help (if you don't soldering): The TV modulator takes as inputs the composite video signal and the audio signal. If you can figure out which is which (e.g. by trying both), you may be able to get a picture on your monitor by just bringing this signal out. However, the level may be wrong so you may get less contrast than you want. If so, you may have to add some amplification or pick the signal off at a better spot. Good luck and hope it turns out to be simple. -John Sangster jhs@mitre-bedford.arpa
bammi@cwruecmp.UUCP (Jwahar R. Bammi) (04/24/86)
> This may help (if you don't soldering): The TV modulator takes as inputs the > composite video signal and the audio signal. If you can figure out which is > which (e.g. by trying both), you may be able to get a picture on your monitor > by just bringing this signal out. However, the level may be wrong so you may > get less contrast than you want. If so, you may have to add some > amplification or pick the signal off at a better spot. > > Good luck and hope it turns out to be simple. > > -John Sangster > jhs@mitre-bedford.arpa Interestingly enough, one of the "undocumented features" on the new STs that have the modulator built in is that pin 2 (two) is composite video out. The documentation says its Reserved. You can pick up the ground from either Pin 8 or 13. The problem of course is getting hold of the connector. If you noticed that the pins (or rather the holes) are at 0.1" spacing. I took a perf board with 0.1 centers and stuck wirewrap pins in them, and it fit beautifully into the video post. You may try molex pins instead that are rounded, but i did'nt have them handy. -- Jwahar R. Bammi Usenet: .....!decvax!cwruecmp!bammi CSnet: bammi@case Arpa: bammi%case@csnet-relay CompuServe: 71515,155