12 Jun
2009
12 Jun
'09
1:51 p.m.
I'm working on reproducing a pair of Cromemco JS-1
joysticks to display (and let the public play with) at
VCF East in September. The one thing I'm missing is a
small, panel mount joystick assembly with 5k Ohm pots.
Not being a Cromemcop person, I don't have scheamtics..
How are the pots used? As potential dividers (one end to ground, other
end to a power line, slider to an analogue input). Or as variable
resistors (only 2 wires brought back from each pot, a commen way to use
them like that was to use them in an RC timing network possibly round a
555 or similar (c.f. Apple ][, IBM PC, etc).
If the former, then the value of the pot doesn't matter too much (I would
think 10k would be fine, for example). If the latter, you might be able
to use other values of pot by changing the timing capacitor or whatever.
If it is used as a potential divider, I have a circuit to use a normal PC
jouystick on such an input ('normal PC joystick meaning one of the old
analouge ones that plugs into a DA15 socket on a games controller card).
I can dig it out if you think it would be useful. IIRC it's just a
multiple op-amp chip, a couple of transistors, and some R's and C's. I
designed it to use PC joysticks on a Vectrex.
-tony