Nintendo DMG-01 - Game Boy Console Manual page 110

3.3.7. Bit Opcodes
3. RES b,r
Description:
Reset bit b in register r.
Use with:
b = 0 - 7, r = A,B,C,D,E,H,L,(HL)
Flags affected:
None.
Opcodes:
Instruction
RES
RES
RES
RES
RES
RES
RES
RES
Page 110
Parameters
b,A
b,B
b,C
b,D
b,E
b,H
b,L
b,(HL)
Game Boy
Opcode Cycles
CB 87 8
CB 80 8
CB 81 8
CB 82 8
CB 83 8
CB 84 8
CB 85 8
CB 86 16
TM
CPU Manual
V 1.01