Nintendo DMG-01 Manual - Page 50

FF24 NR 50, FF25 NR 51

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2.13.1. I/O Registers Game BoyTM CPU Manual 27. FF24 (NR 50) Name - NR 50 Contents - Channel control / ON-OFF / Volume (R/W) Bit 7 - Vin->SO2 ON/OFF Bit 6-4 - SO2 output level (volume) (# 0-7) Bit 3 - Vin->SO1 ON/OFF Bit 2-0 - SO1 output level (volume) (# 0-7) Vin->SO1 (Vin->SO2) By synthesizing the sound from sound 1 through 4, the voice input from Vin terminal is put out. 0: no output 1: output OK 28. FF25 (NR 51) Name - NR 51 Contents - Selection of Sound output terminal (R/W) Bit 7 - Output sound 4 to SO2 terminal Bit 6 - Output sound 3 to SO2 terminal Bit 5 - Output sound 2 to SO2 terminal Bit 4 - Output sound 1 to SO2 terminal Bit 3 - Output sound 4 to SO1 terminal Bit 2 - Output sound 3 to SO1 terminal Bit 1 - Output sound 2 to SO1 terminal Bit 0 - Output sound 1 to SO1 terminal Page 50 V 1.01

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2.13.1. I/O Registers
Game Boy
TM
CPU Manual
27.
FF24 (NR 50)
Name
- NR 50
Contents - Channel control / ON-OFF / Volume (R/W)
Bit 7 - Vin->SO2 ON/OFF
Bit 6-4 - SO2 output level (volume) (# 0-7)
Bit 3 - Vin->SO1 ON/OFF
Bit 2-0 - SO1 output level (volume) (# 0-7)
Vin->SO1 (Vin->SO2)
By synthesizing the sound from sound 1
through 4, the voice input from Vin
terminal is put out.
0: no output
1: output OK
28.
FF25 (NR 51)
Name
- NR 51
Contents - Selection of Sound output terminal (R/W)
Bit 7 - Output sound 4 to SO2 terminal
Bit 6 - Output sound 3 to SO2 terminal
Bit 5 - Output sound 2 to SO2 terminal
Bit 4 - Output sound 1 to SO2 terminal
Bit 3 - Output sound 4 to SO1 terminal
Bit 2 - Output sound 3 to SO1 terminal
Bit 1 - Output sound 2 to SO1 terminal
Bit 0 - Output sound 1 to SO1 terminal
Page 50
V 1.01