Mario Bros. board
Game hangs with corrupt screen, reboots, crashes. Just basically borked.
Replaced Z80A on main board, game now runs.
Second problem:
Unless +5v turned up to 5.20 or higher sprites corrupt (chunks missing /
wrong on opening logo, sprite noise in normal game play).
Sprite ram is @ 8B&C on video board, tried piggybacking 2114's no change.
Piggybacked 74ls273 @ 8D, corruption gone. Replaced 8D board now works fine
at 5V.
Determined 2114 rams at 8 B & C are sprite rams (shorting data pins showed
sprite corruption)
Determined 2114 rams at 3 D & E are background roms (same shorting showed
background corruption)
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Received on Sun Sep 9 22:00:24 2012
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