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Old 31 December 2013, 08:03   #2
Toni Wilen
WinUAE developer
 
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 42
Posts: 19,561
Without downloading and testing anything, my crystal ball says you trigger OCS/ECS undocumented hardware feature: when BPLCON2 has invalid value (too large), bitplane count is 5, other planes are ignored when bitplane 5 has bits set.

This is used in game SWIV for score information.

EDIT: this one http://eab.abime.net/showpost.php?p=206345&postcount=5

Last edited by Toni Wilen; 31 December 2013 at 12:28.
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