Re: Use a NES Joypad on a IIgs!

[dempson@actrix.gen.nz (David Empson)]

Frank Carney <frankcNOSPAM@cyberhighway.net> wrote:

> I think the interface is different for the switches.  The analog is
> okay, but in a PC you short out the switches when you press something.
> In the Apple it is a bit different.  It actually accepts a TTL signal.

Not exactly.  On most Apple II models, a TTL signal will usually work,
but is not the recommended method.  In the IIc family, a TTL signal does
not work (the IIc uses a current input arrangement for the buttons).

The correct wiring for switch inputs on an Apple II joystick is a
momentary closed switch to +5V, with a pull-down resistor.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand