Switching is always allowed, but is valid from the next line.
PAL: TV format
0: PAL
1: NTSC
Switching is possible only during V Blank
PRI: Screen priority (explained later)
0: MEGA Drive has priority (initial value)
1: 32X has priority
Switching is always allowed, but is valid from the next line.
240: 240 Line Mode (Valid only when PAL)
0: 224 Line (initial value)
1: 240 Line
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