John Payson wrote:

> By the way, a few of points to ponder:
>
> [1] Why is the TRS-80 color computer the only home computer which
>     uses the potentiometers in analog joysticks as actual potentio-
>     meters [i.e. uses them to generate a *VOLTAGE* proportional to
>     position]?  Although Tandy's joysticks were really quite feeble
>     voltage-based pot sensing is much better from an EMC perspective
>     and is much less sensitive to pot wear and tear than resistance
>     based measurements.

  The resistor and cap to charge method is the most simple
possible, and therefore cheapest.  Anything that really puts
out a voltage takes more circuitry to read.  Doesn't matter
so much now, but at the time the Apple II and Atari 2600
were made, silicon was a lot more expensive.
  Also he needs to know if the gravis is truly a resistance
or voltage source to decide how to read it.  And if it is
resistance, may as well use the resistor cap method with two
diodes and read both pots on one pic pin, as some others
discussed a while back..

Alan