Linux I/O port programming mini-HOWTO Linux I/O port programming mini-HOWTO Author: Riku Saikkonen <[e-mail]>v, 28 December 1997This HOWTO document describes programming hardware I/O ports and waiting for small periods of time in user-mode Linux programs running on the Intel x86 architecture.1. Introduction2. Using I/O ports in C programs2.1 The normal method2.2 An alternate method: /dev/port3. Interrupts (IRQs) and DMA access4. High-resolution timing4.1 Delays4.2 Measuring time5. Other programming languages6. Some useful ports6.1 The parallel port6.2 The game (joystick) port6.3 The serial port7. Hints8. Troubleshooting9. Example code10. Credits =