SEGA SATURN DEVELOPER'S MANUAL

Table 4.8 Address value of map specification register by setting

Plain size	Pattern name Data size	Character size	Bits used and actual address value
1 horizontal page x 1 vertical page	1 word	1 horizontal cell × 1 vertical cell	(value of bits 6 to 0) × 2000H
	1 word	2 horizontal cells x 2 vertical cells	(value of bits 8 to 0) × 800H
	2 words	1 horizontal cell x 1 vertical cell	(bits 5 to 0 Value) x 4000H
	2 words	2 horizontal cells x 2 vertical cells	(value of bits 7 to 0) × 1000H
2 horizontal pages x 1 vertical page	1 word	1 horizontal cell × 1 vertical cell	(value of bits 6 to 1) × 4000H
	1 word	2 horizontal cells x 2 vertical cells	(value of bits 8 to 1) × 1000H
	2 words	1 horizontal cell x 1 vertical cell	(bits 5 to 1 Value) x 8000H
	2 words	2 horizontal cells x 2 vertical cells	(value of bits 7 to 1) × 2000H
2 horizontal pages x 2 vertical pages	1 word	1 cell horizontally × vertical 1 cell	(value of bits 6 and 2) × 8000H
	1 word	2 horizontal cells x 2 vertical cells	(value of bits 8 to 2) × 2000H
	2 words	1 horizontal cell x 1 vertical cell	(bits 5 and 2 Value) x 10000H
	2 words	2 horizontal cells x 2 vertical cells	(value of bits 7 to 2) x 4000H

[Note] When VRAM capacity is set to 4M bits, the most significant bit in the used bits is not used.