bsp;
比如说，为了检查游标键的左、右、上、下等八个方向的移动，以便作相应的处理，程式居然写成：
100: PP1: MOV AH,0
101: INT 16H
102: CMP AX,4800H ;↑键
103: JNE NEXT1
104: CALL MOVDATA ;SET BUFFERS
105: CALL SETDLT ;SET INCREMENT
106: NXT01:
107: CALL DOTUP
108: LOOP NXT01
109: CALL XORDOT ;SET NEW DOT
110: CALL XYDISP ;DISP NEW XXX,YYY
111: JMP PP1
112: NEXT1:
113: CMP AX,5000H ;↓键
114: JNE NEXT2
115: CALL MOVDATA ;SET BUFFERS
116: CALL SETDLT ;SET INCREMENT
117: NXT02:
118: CALL DOTDOWN
119: LOOP NXT02
120: CALL XORDOT ;SET NEW DOT
121: CALL XYDISP ;DISP NEW XXX,YYY
122: JMP PP1
123: NEXT2:
124: &
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