Re: Apple ][e <---> 16 I/O lines

[wbaguhn@nyx10.cs.du.edu (Will Baguhn)]

In article <4j26ad$lk7@acme.freenet.columbus.oh.us>,
Dave Althoff <dalloff@freenet.columbus.oh.us> wrote:
>Ben Slagle (aq760@yfn.ysu.edu) wrote:
>
>: Does anyone have a schematic for a device to allow me to control
>: 16 digital inputs and outputs from my Apple ][e? Thanks in advance.
>
>Do you mean you have a total of 16 lines that you are switching between ON
>and OFF states?  If so, then you might be able to use a 4->16 decoder, and
>use the four annunciator outputs on the paddle port to choose a line, then
>use the utility strobe to trigger it.  Forget about using double-hi-res
>graphics at the same time if you do that, though.
>
>Another tactic might be to use a Super Serial Card (or other serial
>interface) and develop a serial control bus of some sort...I think there
>was a schematic for this kind of switching controller in a recent issue of
>Radio World...I can see if I can dig it up.
>
>It does seem kind of counter-productive though to use a serial interface
>when you have access to the Apple's parallel I/O bus through the interface
>slot...
>
>--Dave Althoff, Jr.
>-- 
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Or... get a standard parallel card and build some latches onto it.