rjexp16.asm

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DATA  SEGMENT
WCHAR DB  70H            ; ；反相显示
WLUX  DB  0
WLUY  DB  0
WRDX  DB  23
WRDY  DB  79
DATA  ENDS
STACK  SEGMENT
STA   DB    50 DUP(?)
TOP   EQU   LENGTH STA
STACK  ENDS
CODE  SEGMENT
ASSUME  CS:CODE,DS:DATA,ES:DATA,SS:STACK
START:  MOV  AX,DATA
        MOV  DS,AX
        MOV  ES,AX
        MOV  AX,STACK
        MOV  SS,AX
        MOV  SP,TOP   ;段寄存器和堆栈初始化
        MOV  AH,07H
        MOV  AL,00   ;清窗口
        MOV  BH,WCHAR   ;窗口显示特性
        MOV  CH,WLUX
        MOV  CL,WLUY    ;左上角
        MOV  DH,WRDX
        MOV  DL,WRDY  ;右下角
        INT  10H      ;显示I/O      
PPP:    MOV  AX,4C00H
        INT  21H
CODE    ENDS
END     START