> Looking at the source (http://git.redump.net/mame/tree/src/mame/drivers/scobra.c who > said you can't look at the source in git?) I noticed that Rescue and Minefield have > different video inits than the other games in the driver. The comments say that both > use more palette for the backgrounds. Note that Rescue uses the same background > colours twice, while Minefield uses two different gradients thus defines double the > background colours than Rescue.
Looking at the source doesn't help you. That is how we draw the background, not how the original hardware draws it.
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