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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
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