Yes -- lots of Acorn machines in the UK had "user
ports" with a bunch
of general-purpose IO pins. Very useful for interfacing random
external hardware to the computer (such as a model railway, a
shortwave radio and my hamster's wheel, in my case).
The first 2 I can understand (although there are many different ways to
control model railways...). But please explain the last. Was it an input
or an output device, for example?
-tony