Re: Unknown device plugged into internal joystick socket

[Rubywand <rubywand@swbell.net>]

David Empson writes ...
> 
> Chris Baird <cbaird@turing.une.edu.au> wrote:
> 
> > A recently rescued IIe has a unknown device plugged into the interal
> > analogue port, consisting of a 74LS04, 74LS10, and some ribbon cable
> > in a yet-to-be-determined circuit.  Construction looks homemade.
> > Does this sound familiar to anyone?
> 
> The LS04 is a hex inverter and the LS10 is a triple 3-input NAND gate,
> so I guess this is doing some logic function with the switch inputs
> and/or annunciator outputs.  Why, I have no idea.
> 
> It doesn't sound too sophisticated - no flip-flops, latches, or shift
> registers, for example.
 ....


     It sounds like a an interface to control something simple, like a
tape recorder or slide projector.



Rubywand