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CPU Reset 0 0 Maskable Interrupt, INT Disabled
DI Instruction Execution 0 0 Maskable INT Disabled
EI Instruction Execution 1 1 Maskable, INT
Enabled
LD A,I Instruction Execution * * IFF2 ñ Parity Flag
LD A,R instruction Execution * * IFF2 ñ Parity Flag
Accept NMI 0*MaskableñInterrupt
RETN Instruction Execution IFF2 * IFF2 ñindicates completion of non-
maskable interrupt service routine.