...四位计算器的程序图和电路图,仿真图。4X4键盘。能计算加减乘除...答:ORG 0000H LJMP START ORG 1000H START:MOV R0,#0 MOV R1,#0 MOV R5,#0 MOV 30H,#0 MOV 31H,#0 MOV R2,#0 MOV R3,#0 MOV R4,#0 ACALL DISP ACALL KEY AJMP START D00:CJNE R0,#0,Y0 MOV A,30H MOV B,#10 MUL AB MOV 30H,#0 ADD A,30H MOV 30H,A JMP FK Y0:...