Datasheet Summary
ZBasic
AN-203 I/O Expansion Techniques
Introduction
Application Note
On more plex projects it is often the case that more I/O lines are needed than the number that are available on the chosen processor. In this situation, you might first try to redesign the application to require fewer I/O lines. For example, you may be able to use a given output for multiple purposes. If you still need additional I/O lines, there are several techniques that you might employ, separately or in bination, to solve the problem. Although the examples given in this application note are based on the ZX-24, the principles can be equally well applied to the other ZX processors.
Using a Multiplexer for...
