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BIOSF_VIDEOEN ($C00570): Enable/disable video layers

Only available on CD systems. All used registers are preserved.

The parameters are in bits 0~2 of D0:

Bit 7 6 5 4 3 2 1 0
Def Don't care Enable video output
(locks up ?)
Enable spritesEnable fix layer

Enabling doesn't seem to work on real hardware ? (one way disable ?)

This function internaly uses the $FF0115, $FF0111 and $FF0119 memory mapped registers.