BIOSF VIDEOEN
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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 sprites | Enable 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.