[couchand]

Curious, MIDI is a decidedly digital protocol...

[Fronzie]

ISA cards, like the soundblaster had the MIDI and joystick on the same connector. The joystick had up to 4 analog inputs, maybe that's what's meant here.

[dfox]

The PC game port is a nearest thing to intentional GPIO that PC has. Parallel port is almost always better for digital GPIOs, but it was not designed that way and the fact that it can be used like that (and extended several times into what in the end was SCSI-like protocol) is kind of an coincidence.

[crest]

Maybe it would be better to say it was a common enough interface to hook up devices that were essentially a bunch of potis and not much more?