Intel x86 Opcode Reference?

Question

What is a relatively quick and easy method of looking up what an arbitrary opcode means (say, 0xC8) in x86?

The Intel Software Developer\'s manual

Answer 1

Check this very complete table of x86 opcodes on x86asm.net.

Just CTRL+F and you're done! Be sure to read the correct line tho, as C8 for example may appear in several locations.