I remember writing a print spooler for the Apple II. It only worked with RS-2332...

		tonyedgecombe on Dec 24, 2020 \| parent \| context \| favorite \| on: Windows 0day privilege escalation still not fixed I remember writing a print spooler for the Apple II. It only worked with RS-2332 because the Centronics interface didn't support interupts. I don't think parallel ports connected directly to the bus, there was always an interface chip like the Intel 8255.

You're right, just not as well isolated as RS-232.