First would be to determine if it's just background (horizon), or if it's any object of a certain intensity... I think BZ uses three bits for intensity going through J9 and H8 leading to the Z out. You could also check the resistors and transistors in that circuit on the AVG board.
On Nov 22, 2012, at 12:33 PM, Danny Pearson wrote:
> Hi guys, got a bit of a weird issue on a Battlezone. The game plays fine, on the scope I can see all the objects and background just perfect (but with retrace lines as I don't have a Z input on my scope). Plugged into the cab and there's no background at all, no mountains. The moon and Volcano eruption is there just no mountains at all. Am I right in guessing this is an issue in the Window circuit? Has anyone seen this before?
>
> Dan
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Received on Thu Nov 22 12:52:47 2012
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