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#parallel-port

2 posts

FreeDOSDeep Dive October 3, 2026 7 min read

DOS BIOS INT 17h: Printer Calls, Status Bits, and Their Limits

Interpret IBM-compatible BIOS INT 17h printer calls without mistaking status bits for a reliable printer-health check or a complete DOS spooler.

#freedos#bios#printer

FreeDOSDeep Dive October 3, 2026 8 min read

Operate a documented PC-compatible SPP port by separating data, status, and control state, bounding waits, and preserving BIOS and device ownership.

#freedos#dos#parallel-port