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

[Cyrus Roton <croton@ridgecrest.ca.us>]

On 22 Mar 1996, Ben Slagle 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.

I do not have the schematic, but I have a FLY BOARD, not sure who made it 
since I no longer have the manual. It has two 8-bit ports from a 6522 I/O 
chip. Since you asked for schematics, I assume that you intend to build 
an interface card. If you have info on how to interface (i.e., Apple 
Interfacing, by J.S. Titus, Howard W. Sams Inc), and if you can get the 
spec sheets for such a chip (or another similar one), it would not be 
difficult to design the interface. Other than an EPROM (which is not 
essential), the Fly Board has only four other chips (74LS00, 74LS32, 
74LS04, 74LS40)

The I/O chip is somewhat programable, in that you can send it 
instructions to configure the ports and the registers. Thus, some of the 
lines can be input while others can be outputs, as desired, under program 
control. This is a lot simpler than designing your own logic to acheive 
selectable I/O.

Although I do not have the manual for the Fly Board, I kept enough 
documentation on the intended project I was developing so that I still 
can use the card for other projects.

Good luck on your project. Let us know the results, as others might need 
the benifit of your experience.


Cyrus Roton   croton@ridgecrest.ca.us
Ridgecrest Apple User Group