Re: C128 VDC video questions

From: Nicolas Welte (
Date: 2000-03-10 17:29:53

Martijn van Buul wrote:
> > 3) Are the HSYNC and VSYNC lines the same as a composite display (nothing
> > inverted or anything...just put on separate lines)?
> Err.. The -meaning- of those signals is the same. I do not recall them to
> be inverted, but it woudln't strike me as odd to see a / before them :)

I also can't remember the absolute polarity, but on the composite
monochrome output they are correctly put together. Also, with the x568
VDC of the CR machines you can program the polarity of each line
separately. It's the extra register 36 (?), bits 0 and 1. Also, didn't
anybody wonder that this register is described in the C128 PRG (german
translation, at least), but nowhere else? And when the PRG was printed
only the 8563 VDC existed and it didn't offer that feature.

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