I took a break from my C64 tool, and decided to just
use it in it's beta stage to do a little A2600 program.
It just displays a stable screen (3 lines of VSYNC, 37
of VBLANK, 192 picture, and 30 of overscan), changing
one of the playfield registers every line. Worked my
first try ;)
Anyway, this prompts a couple questions:
1) How do I know I've made _exactly_ the 262 lines per
frame? It seems TVs are fairly resilient, and will
allow at least a few lines of error, with ?no difference?
visible. I mean, how can you know without counting
through it all, and being ?certain?
2) Why is overscan differentiated from the main 192 line
display? Can you not display graphics there? Should
you blank the screen for that area? Is there anything
special you should do in that area?
--
Robin Harbron robinh@xxxxxxxxxxxxxxx
http://www.tbaytel.net/macbeth
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