cpu:onBeforeExecuteInstruction(0x60, function(cpu, opcode, operand)
end)

cpu:onBeforeExecuteInstruction(0x20, function(cpu, opcode, operand)
end)

cpu:onAfterExecuteInstruction(0x60, function(cpu, opcode, operand)
end)

cpu:onAfterExecuteInstruction(0x20, function(cpu, opcode, operand)
end)