Nintendo DMG-01 - Game Boy Console Manual page 98

3.3.5. Miscellaneous
9. DI
Description:
This instruction disables interrupts but not
immediately. Interrupts are disabled after
instruction after DI is executed.
Flags affected:
None.
Opcodes:
Instruction
DI
10. EI
Description:
Enable interrupts. This intruction enables interrupts
but not immediately. Interrupts are enabled after
instruction after EI is executed.
Flags affected:
None.
Opcodes:
Instruction
EI
Page 98
Parameters
-/-
Parameters
-/-
Game Boy
Opcode Cycles
F3 4
Opcode Cycles
FB 4
TM
CPU Manual
V 1.01