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

[dalloff@freenet.columbus.oh.us (Dave Althoff)]

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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