Taken: AT 286 motherboard with mathco
ard at p850ug1.demon.co.uk
Sat Oct 20 15:18:33 CDT 2007
> Pete Turnbull wrote:
> > The user port was typically used for home-grown digital I/O, but some
> > commercial hardware used it too, eg at least one mouse, some satellite
> > hardware, a turtle, a robot arm, and a CNC lathe controller. I used it
> > to interface to a PCB tester I made to test some circuit boards I made.
> All of these can be hooked up with a serial port, so I'm still wondering
> why today's machines are considered lacking for not having a "user port".
The _oriignal_ use of the 'user port' was for _users_ to connect their
own gadgets to.
It is a lot easier to connect you hamster wheel/ relay-to-control-lights/
homebrew circuit to an 8-bit parallel port than to a serial port (or
worse a USB port). Yes I know there are microcontrollers with built-in
serial ports, USH interfaces, and whatever. But the thought of having to
write the firmware for the microcontroller, get it debugged, etc, puts
people off. COnnecting a couple of resistors and a transistor together is
an easier introduction to hardware hacking.
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