INT 17 - Printer BIOS Services

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~INT 17,0~ Print character

~INT 17,1~ Initialize printer port

~INT 17,2~ Read printer port status

Status flags returned in register AH

¦7¦6¦5¦4¦3¦2¦1¦0¦ AH (status)

¦ ¦ ¦ ¦ ¦ ¦ ¦ +---- time-out

¦ ¦ ¦ ¦ ¦ +------- unused

¦ ¦ ¦ ¦ +-------- 1 = I/O error (~parallel~ pin 15)

¦ ¦ ¦ +--------- 1 = printer selected/on-line (parallel pin 13)

¦ ¦ +---------- 1 = out of paper (parallel pin 12)

¦ +----------- 1 = printer acknowledgment (parallel pin 10)

+------------ 1 = printer not busy (parallel pin 11)

- on the AT, XT 286, and PS/2 when the BIOS determines the printer

is busy, ~INT 15,90~ is executed

- all printers do not return reliable status information; bit 3 and

bit 7 are usually reliable.

- all registers are preserved except AH