I/O instructions exchange data between A and external devices via ports.
- IN port - read from port to A (2 bytes, 10 tacts)
- OUT port - write A to port (2 bytes, 10 tacts)
Port assignments in the emulator:
- Monitor port - character and pixel output
- Floppy/HDD ports - storage device I/O
- Network ports - data transmission/reception
- Printer port - print output
Device state is shown in the Quick Access panel and device windows.