Re: Dip Switches on an Apple Super Serial Card

[pausch@saaf.se (Paul Schlyter)]

In article <3ab43080$1@news.uow.edu.au>, David Wilson <david@uow.edu.au> wrote:
 
> 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
 
Which still leaves this question open:
 
Is "On" the same as "Open", or as "Closed" ???
 
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