；怎么调试？我是一窍不通，请大家来帮个忙，指点一下，在线等。
TITLE        A08DISAS (COM)    DISPLAY    ASCII
        .MODEL    SMALL
        .CODE
        ORG    100H
BEGIN:        JMP    SHORT    A10MAIN
ASCHAR        DB    00,'$'

A10MAIN        PROC    NEAR
        CALL    B10SCREEN
        CALL    C10CURSOR
        CALL    D10DISPLY
        MOV    AX,4C00H
        INT    21H
A10MAIN        ENDP

B10SCREEN    PROC    NEAR
;         PUSHA
        MOV    AX,0600H
        MOV    BH,07
        MOV    CX,0000    
        MOV    DX,184FH
        INT    10H
;               POPA
        RET
B10SCREEN    ENDP

C10CURSOR    PROC    NEAR
;         PUSHA
        MOV    AH,02H
        MOV    BH,00
        MOV    DX,0800H
        INT    10H
;         POPA
        RET
C10CURSOR    ENDP

D10DISPLY    PROC
;         PUSHA
        MOV    CX,256
        LEA    DX,ASCHAR
D20:        CMP    ASCHAR,08H
        JB    D30
        CMP    ASCHAR,0DH
        JBE    D40
D30:        MOV    AH,09H
        INT    21H
D40:        INC    ASCHAR
        LOOP    D20
;               POPA
        RET
D10DISPLY       ENDP
        END    BEGIN