On May 1, inri wrote:
> Hi
> I am trying to input data using 7 switches connected to the parallel port. I do not know much about elektronics , and i put together a small circuit which does not work correctly. It was based on several parallelport - interfacing howtos i found in the web.
> Three switches are connected to Pins 11, 12, 13 like this :
>
> pin ---------o-|R 13k|--- +5V
> |
> o--switch--- +- 0V
>
> Four switches are connected to Pins 1, 14, 16, 17 :
>
> pin ---------|out Inverter 74LS05 in|---o--|R 13k|---- +5V
> |
> o--switch----- +- 0V
>
Pins 1,14,16,17 are output pins accessible via bit 0-3 of the control
register (base+2). You should connect a led after the inverter.
Pin 10 and 15 are further inputs if you need more switches. For
bidirectional ports (PS2, EPP...) you can also use the Data-Lines
(Pin2-9) as inputs _after_ setting the direction bit (bit 5) in the
control register.
Don't ask me for electrical specification, though.
Jochen
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