OSDev.org

Hello.
In James Molloy's tutorial, the IRQ handler function calls outb(0xA0, 0x20); and later outb(0x20, 0x20);.
Could anyone please link to a list of ports, that I could use to macro those magic numbers into something understandable?
Thank you.

At the top of the forum you find a link labeled "The OSDev.org Wiki - Got a question? Search this first!".

Searching that for "Ports" yields:

I/O Ports
Where Can I Find Information About Ports
Port IO

Bottom line: No such thing - for a reason.