[Coco] Update: More on the "Peritel CoCo2"

[Torsten Dittel]

I just tried to hook the Composite Video Luminance Signal directly to
the C-Sync input of the 1084S and it works! Looks like I don't need the
Sync Stripper circuit for that monitor. Nevertheless I will build one to
try my NEC MultiSync 2D which needs sperated H- and V-Sync. I have seen
an IC which outputs H-, V- and C-Sync, not just V and C like the 1881.

Regards,
Torsten

Torsten Dittel schrieb:
> 
> I think I understood the signals coming out of the CoCos Peritel
> connector (this is the view on the soldering side of a male Mini DIN
> plug for that connector):
> 
>   1   2   3
>   o   o   o
>  4         5
>  o   [ ]   o
>     6   7
>     o   o
> 
> DIN       PERITEL
> 1 - Blue  -  7
> 2 - Audio -  6
> 3 - Green - 11
> 4 - CVL   - 20
> 5 - Red   - 13
> 6 - GND   - 17
> 7 - 12 V  -  8
> 
> CVL = Composite Video Luminance (black & white picture only)
> 
> Inside the Peritel connector there's a 550 Ohm resistor connecting pin 8
> with 16: this input has an impedance of 75 Ohm so there's a voltage of
> 1.5 V present. The 12 V at pin 8 is selecting "AV" as video source, the
> 1.5 V at pin 16 is selecting "RGB" as a video source.
> 
> My Commodore 1084S accepts either H-Sync and V-Sync separated or
> Composite Sync on its 9 pin D-SUB connector. I guess I have to add a
> "Sync Stripper" to my cable to get the C-Sync (e.g.
> http://www.homecinemapage.de/sync.htm ). I hope it can be driven by the
> 12 V coming out of the CoCo. Most TV sets capable of RGB input have this
> Sync Stripper included and use the Composite Video to generate the
> H-Sync and V-Sync.
> 
> Regards,
> Torsten
> 
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