Undocumented 16-bit I/O addressing on Z80...

Turning keyboard LED lights on...

GNU assembler syntax for IN and OUT instructions...

what does "outb" in AT&T asm mean?...

Access to PIT (?) IO ports 44h and 46h - what do those ports do?...

how to find out which ioports be assigned to my devices...

How to use ins instruction with GNU assembler...

Is REP INSB interruptible?...

Controlling ports in a loop using Vex RobotC...

How GPIO is mapped in memory?...

For C what is the Windows header version for Linux header <sys/io.h> I/O Ports...

Writing to I/O Port Controller driver (inpout) (PS/2 Keyboard port) Left and Right keyboard keypress...

Placement new, objects placed over I/O registers and zeroed memory...

Linux NASM OUTSB SegFault...

Python mmap /dev/port...