Int 17 Fn 00  - Printer - Write Character                                  [B]

   AH = 00h
   AL = character to write
   DX = printer number (00h-02h)

Return: AH = printer status (see below)

See Also: AH=02h,AH=84h"AX",AH=F1h,INT 16/AX=FFE3h,INT 1A/AH=11h"NEC"

Bitfields for printer status:
 bit 7 not busy
 bit 6 acknowledge
 bit 5 out of paper
 bit 4 selected
 bit 3 I/O error
 bits 2,1 unused
 bit 0 timeout