[Coco] 384 or 450 scanlines ?

[Gene Heskett]

On Friday 10 January 2014 07:55:34 Mathieu Bouchard did opine:

> Le 2014-01-10 à 10:37:00, Nick Marentes a écrit :
> > Ciaran Anscomb <cocomalt at ...> writes:
> >> I see it as only doing progressive - half resolution, double rate
> >> (50Hz or 60Hz) progressive.  The machines never actually *emit* that
> >> blank field you describe, the lines for it are just never scanned.
> > 
> > It would be good to know for sure. I thought that a CoCo compatible
> > RGB, composite or TV is an interlace video device only. 15Khz
> > interlaced at 50/60 hertz. If the CoCo is not generating the blank
> > field and it's progressive, surely the frequency would be higher?
> > (and it's not)
> 
> I think that two of us are saying that an interlaced signal of
> half-fields, and a progressive signal with incredibly long vblanks, are
> just two ways of saying the same thing.

No long vblanks, each 'field' simply lays the same info down over the same 
line, so you only get the lines per field for vertical resolution.

Cheers, Gene
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