按照要求设计指令系统，该指令系统能够实现数据传送，进行加、减运算和无条件转移，具有累加器寻址、寄存器寻址、寄存器间接寻址、存储器直接寻址、立即数寻址等五种寻址方式-In accordance with the requirements of the design of instruction, the instruction set to achieve data transmission, for add, subtract operation and unconditional transfer, with accumulator addressing, register addressing, register indirect addressing, memory direct addressing, immediate addressing, such as the number five addressing mode