RE: Battlezone missing background

Hi Douglas, thanks mate you put me on the right track. I didn't realise BZ
had 3 separate bits for Z. Armed with this I traced them back and found
one was indeed missing. The root cause was a bad 74LS175 @ J8 which is
annoyingly on Sheet 3 of the schematics instead of Sheet 2 like the rest of
the circuit :)

Dan

From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of Douglas Gauck
Sent: 22 November 2012 17:53
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Battlezone missing background

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 29 09:37:08 2012