DOS 1.0 : Displays any character on the standard output device

AH = 2
DL = OutputChar (ASCII value)
   = 7 : Beep
   = 8 : Backspace

• If output device is the screen, a backspace (ASCII 8) moves cursor back one position but does not erase the character
• Output may be redirected
• <ctrl-break>: INT 23
• Superceded >40: Write File or Device

Display an 'A'

mov dl,'A' mov ah,2 int 21h

 

Display a string of characters:

msg db 1,2,3,"Hello World",13,10,"$" len equ $-msg mov si, offset msg mov cx, len do: mov dl, [si]
mov ah, 2 ;Display Character int 21h
inc si loop do