🚀 go-pugleaf

   Khan was espousing about 'Re: using atari 2600 joys',
   on [10-09-92  18:37] to All!
 Kh> Well, I think it CAN be done. All an IBM joystick is is a couple of
 Kh> variable resistors hooked to the joystick. When the stick is full
 Kh> left, one pot is 0 resistance; when it's full right, the pot is 200k
 Kh> ohms (or something like that - I don't have the exact specs in front of
 Kh> me). 
 Kh> All you would need to do would be to re-wire the PC board inside the
 Kh> Atari stick such that full left went straight through, a full right
 Kh> went through a 200k resistor, and analogous connections for up and
 Kh> down. You'd also have to rig some way for the stick to read 100k ohms
 Kh> in each channel when centered.

    Thier's a MUCH better way of doing this.  Each of the contact
    switches in the Atari joystick represents a bit pattern.  All
    you have to do is use one of the parrallel port output pins
    to provide the TTL logical HIGH.  Then wire the joysticks
    outputs to 4 pins to 4 of the printer ports inputs, Busy, Out
    of Paper, Error and On-Line.  The joystick button can be
    wired to the printer port ACK signal that way whenever the
    button is pushed it CAN generate an interupt.  If you wire it
    correctly you can use the STRB to supply power to the
    joystick.  What does this get you?  Well it allows you to use
    the printer port for printing whenever your not using the
    joystick.

    This requires the use of some added circuitry however.

            Stephen Cyberman@Toz.Buffalo.NY.US
            Scripted at Sat  10-10-1992  13:05:30

... Laugh at your mistakes, Everyone else does!
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