Nintendo GAME BOY Programming Manual page 143

d7 d6 d5 d4 d3 d2 d1 d0
01h
02h
:
0Fh
If 2 or more packets are used for one system command, bits 00h-Fh of the second packet
onward are used for data.
Transmission Procedure
1. Start of write
2. Data transmission (example)
d0,
00h: 0
No. of packets: 2h Command code: 1h
01h: data
02h: data
:
:
Fh: data
3. Transmission of 0 in bit 129
Bit 129: 0
4. Start of write
5. Data transmission: second packet
00h: data
01h: data
:
:
Fh: data
: :
0
Transmitted Data
d1, d2, d3,
1 0 1
:
:
:
:
Chapter 6: The Super Game Boy System
Transmitted Data
:
0 transmitted in bit 129
d4, d5, d6, d7
0 0 0 0
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