Nintendo GAME BOY Programming Manual page 55

1) With BG display data allocated to 9800h-9BFFh:
RAM Address
CHR Code & ATRB
9800h
9801h CHR Code & ATRB
9802h CHR Code & ATRB
CHR Code & ATRB
9BFDh
CHR Code & ATRB
9BFEh
CHR Code & ATRB
9BFFh
ATRB: Attrubute
Note: Attributes specified only with CGB
2) With BG display data allocated to 9C00h-9FFFh:
RAM Address
9C00h CHR Code & ATRB
CHR Code & ATRB
0C01h
CHR Code & ATRB
9C02h
CHR Code & ATRB
9FFDh
9FFEh CHR Code & ATRB
9FFFh CHR Code & ATRB
ATRB: Attribute
Note: Attributes specified only with CGB.
Block No.
0
1
2
144 dots
(18 blocks)
1021
1022
1023
544
576
608 609 610
256 dots
32 blocks
992
Block No.
0
Correspondence between LCD screen and block
1
numbers as shown in preceding figure.
2
1021
1022
1023
160 dots
(20 blocks)
0 1 2
32 33 34
64 65 66
96 97 98
545 546
577 578
993 994
Portion displayed to LCD
when (SCX, SCY) = (0,0)
Portion displayed to LCD when
(SCX, SCY) = (152, 8)
55
Chapter 2: Display Functions
256 dots
(32 blocks)
19 20
51 52
83 84
115 116
563
30 31
62 63
94 95
126 127
1022 1023