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Add file explaining registers

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greg 2016-12-04 21:13:31 -08:00
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commit 313850ca84
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$2100 - screen on/off + brightness
$2105 - screen format register, changes size of tiles
$2121 - stores the index into CGRAM to write a color value via $2122
$2122 - write a 2-byte SNES color value to the CGRAM. this auto-increments after writing,
which is why $2121 needs to be written to reset this. it's common to write `stz $2121`