debug e200 "Press 1 if Lower to Upper Case","$" e300 "Press 2 if Upper to Lower case","$" e400 "EXIT","$" a100 mov ah,02 mov dl,0a int 21 mov ah,0d int 21 mov ah,09 mov dx,200 int 21 mov ah,02 mov dl,0a int 21 mov dl,0d int 21 mov ah,09 mov dx,300 int 21 mov ah,02 mov dl,0a int 21 mov dl,0d int 21 mov ah,09 mov dx,400 int 21 mov ah,02 mov dl,0a int 21 mov ah,0d int 21 mov ah,01 int 21 cmp al,31 je 153 cmp al,32 je 17f cmp al,33 je 151 jmp 100 int 21 int 20 mov ah,02 mov dl,20 int 21 mov ah,01 int 21 mov bh,al mov ah,01 int 21 mov bl, al sub bh,20 sub bl,20 mov ah,02 mov dl,20
int mov mov int mov mov int int mov mov int mov int mov mov int mov add add mov mov int mov mov int mov mov int int
21 ah,02 dl,bh 21 ah,02 dl,bl 21 20 ah,02 dl,20 21 ah,01 21 bh,al ah,01 21 bl, al bh,20 bl,20 ah,02 dl,20 21 ah,02 dl,bh 21 ah,02 dl,bl 21 20