四、
1.
MOV A, X
CLR C
SUBB A, #50
JNC DAYU
MOV A, X
CLR C
SUBB A, #20
JC XIAOYU
MOV A, X
MOV B, #5
MUL AB
JMP SAVE
DAYU:
MOV A, X
JMP SAVE
XIAOYU:
MOV A, X
ADD A, X
SAVE:
MOV Y, A
SJMP $
END
--------------------------
2.
ORG 0000H
MOV TMOD, #02H
MOV TH0, #156
MOV TL0, #156
SETB TR0
L1: MOV R2, #10
L2: JNB TF0, $
CLR TF0
DJNZ R0, L2
CPL P1.0
SJMP L1
END
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