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Forums > C64 Coding > A question about resolution and refresh rate
2014-10-07 06:46
Parody

Registered: Jul 2013
Posts: 7		 A question about resolution and refresh rate

I have a question, in the form of a set of assumptions, and I hope you will correct me if I'm wrong. :)

The old PAL TV-system had 576 visible lines, each drawn every other 1/50th second (576i 50Hz). The PAL C64 has 200 lines inside the border, so I assume that every C64-line covers two TV-lines. Then, on the TV the two lines that make up the C64-line will be drawn up every other, and opposite, 1/50th of a second. That is, one line is drawn one 1/50th of a second and the other line is drawn up the next 1/50th of a second and so one. The C64 will give you 50 raster interrupts on, let say, line 60 each second (or close enough). So, would this mean that by changing the contents of a line every 1/50th of a second in a raster interrupt you could effectively double the vertical resolution?

Have I understood it correctly? Is what I'm describing FLI?
 
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2014-10-07 08:51
lft

Registered: Jul 2007
Posts: 369		 Quoting Groepaz
Quote:
with a signal consisting of only odd fields

you mean, with a signal where field = frame. there is no odd/even frames at all :)


For somebody who is accustomed to the standard PAL signal, I'm sure that the fields generated by the VIC are quite odd.
2014-10-07 09:42
chatGPZ

Registered: Dec 2001
Posts: 11386		 indeed =D
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