MOV AH,3E
INT 21              ;
PUSH CS
POP DS
MOV AH,4F
MOV DX,025F
INT 21
JB 019E
JMP 013E
MOV DX,0080
MOV AH,1A
INT 21              ;
CMP BYTE PTR [0105],05 ; ¬
JB 0207                ;
MOV AX,0040
MOV DS,AX
MOV AX,[006C]       ;
PUSH CS             ;
POPDS
AND AX,0001
JZ 0207
MOV DX,01C4
MOV AH,09
INT 21
INT 20              ;
DB