[schoen]

What's "random logic"? From context, it sounds like circuitry that explicitly implements the functionality of an opcode, as opposed to circuitry that can be used by the microcode, or something?

[ajenner]

Yes, exactly - the logic that implements the simpler instructions directly as special-purpose gates rather than microcode.

[kens]

To expand on that, "random logic" means that it looks random; it's not actually random. This is in contrast to circuits that have an underlying structure to them, like a PLA or ROM.