[Coco] Coco compatible monitors...

[Robert Gault]

Mark Ormond wrote:
> I've got some NEC Accusync LCD 71Vs in my shop. And playing with groovymame I found that they will sync to 15 and 24k signals,so I hooked one up to my Amigas, but they only display NTSC correctly, pal screens get cut off (I think the monitor only does 240 lines @ 15k). Do you think these will work with the Coco3 with a cable adapter?
> .7v p2p on the input voltages, what does the 3 output?
>
> Just a thought.
>
> (As a note, the tech specs on this monitor say Synchronization Range - Vertical 56 - 75 kHz ,Horizontal 31.5 - 81.1 kHz, but this isn't correct.)
>
> Later,
> dabone
>
>

The Coco3 service manual lists 0.8-2.0v +-0.2 at 75ohm NTSC
                                0.6-1.8v +-0.2 at 75ohm PAL

For my monitor, I found the signal too hot (required 0.3-1.0v at 75ohm) so I 
placed resistors in series with the RGB output (about 1ohm each line I think) to 
reduce the signal. Checked with a scope.