Star Tech Journal

m
November 1993
STAR*TECH Joumal
Prince's Corner
Donald B. Prince
D&RMusic
Bozeman, Montana
CAPCOM BOWLING
ANTI LOCK UP MODIFICATION
PROBLEM
Game locks up upon starting new
game. Hook Button moves Hook
Graphic but bowling ball doesn't
move off of the left side of the
screen, and no sand falls through
~the hour glass graphic.
+Sv
T'SHOOTlNG
Changed Bl Oarge cap that pro-
vides battery-backup), this may be
a battery on some CapcomBowling
Circuit Boards. Changed out both
processors (6809's) and both
RAMs. Changed U24, the input
buffer for the Start Button. Result:
No change -still locked up.
- .
-
OBSERVATIONS
After establishing that the game
only locked up when it started a
new game, I experimented to find
the conditions under which the
starting of a new game would lock
up the game. I found out that an
unstable signal on the Start But-
ton line would always cause a lock
~p. If the start button was held
-- long enough in the "on" position, it
didn't lock up the board. If the
Start Button was pressed quickly,
continued on next page ...
- - -
-
*
lie Unused Inputs Df1f/l8DD to Ground
fifjure f