Online HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens
INT 17 - Printer BIOS Services
For more information, see the following topics:
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
[helppc.bosbyte.nl] int 17,status