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Archived from groups: rec.games.video.arcade.collecting (More info?)
Now that I have a joust machine, I finally got to test a defender board
set I bought many years ago. It was dead, but I soon found that the
main board to rom board ribbon cable had two bad lines and squeezeing
the connector in a vise to reseat the connections fixed that.
The only problem now is two bad video scan lines that appear at the top
of the screen above the "scanner box" (see screen shot). I'm stumped on
what would cause this. Why just two lines at the top?
I checked the theory of operation, but did not see any section that
would cause just this. Any help or comments would be appreciated.
Thanks Ron.
Here is a screen shot.
http://www.mk64.com/ron/line.jpg
Now that I have a joust machine, I finally got to test a defender board
set I bought many years ago. It was dead, but I soon found that the
main board to rom board ribbon cable had two bad lines and squeezeing
the connector in a vise to reseat the connections fixed that.
The only problem now is two bad video scan lines that appear at the top
of the screen above the "scanner box" (see screen shot). I'm stumped on
what would cause this. Why just two lines at the top?
I checked the theory of operation, but did not see any section that
would cause just this. Any help or comments would be appreciated.
Thanks Ron.
Here is a screen shot.
http://www.mk64.com/ron/line.jpg