SEGA SATURN DEVELOPER'S MANUAL

● Plot trigger register

Plot trigger mode: plot trigger mode (PT), bit 1, 0

PTM		Drawing mode
bit 1	0	Drawing mode
0	0	Idle by switching frames
0	1	Draws when 01B is written Start
1	0	Automatic drawing with frame switching Start
1	1	Setting prohibited (do not set) )

Erase write data register

Erase write data: erase write data, bits 15-0