Int 17 Fn 240B  - Shamrock Software Net.24 V3.11+ - Transmit Single Chara  [N]

   AX = 240Bh
   DL = character to send

Return: AL = status (see also AX=2400h)
       03h transmission error
       06h write error

See Also: AX=2407h,AX=240Ah,AX=240Ch