Re: Dip Switches on an Apple Super Serial Card

[david@uow.edu.au (David Wilson)]

kellihanb@aol.comDelete (KellihanB) writes:
>I'm wondering... my Super Serial Card II has the DIP switches marked with one
>side as "Open" the other side not.  With most things electronics, I'd assume
>"Open" means "Off"... however I've been getting some strange results with the
>card... which way is it supposed to be? Open is "on" or Open is "Off"?  

Typically switches like that have pull up resistors and when closed ground
the signal. Thus open = high = 1, closed = low = 0.

	+5v
	|
	\
	/
	\ 10k resistor (example value)
	/
	|
	+----------- input
	|
	|
	  /
	 /
	/
	|
	|
	|
	- Gnd
--
David Wilson  School of IT & CS, Uni of Wollongong, Australia