Int 17/AH=00h

PRINTER - WRITE CHARACTER

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

Return:
AH = printer status (see #00631)

Note: Under PhysTechSoft's PTS ROM-DOS the parallel port can also be accessed as COM5.

BUGS: Some print spoolers trash the BX register on return.. Some original IBM BIOSes set more than one printer status bits at a time, while only one of them is correct.

See Also: AH=02h - AH=84h"AX" - AX=6F02h - AH=F1h - <

See Also: INT 4B/AH=00h - PORT 0278h"PRINTER" - MEM 0040h:0008h - MEM 0040h:0078h

Bitfields for printer status: Bit(s) Description (Table 00631) 7 not busy 6 acknowledge 5 out of paper 4 selected 3 I/O error 2-1 unused 0 timeout

Notes: If both, bit 5 "out of paper" and 4 "selected" are set, the MS-DOS/ PC DOS kernel assumes that no printer is attached.. For Tandy 2000, bit 7 indicates printer-busy when set rather than clear

Category: Bios - Int 17h - P

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