AN-203 - I/O Expansion

General Description

suggests why devices are often labeled decoder/demultiplexer

depending on how you connect it, it can be used to perform either operation.

The 74HC138 and 74HC139 are two examples of a decoder/demultiplexer.

The former is a single 1 of 8 device while the latter is a dual 1 of 4 device.

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AN-203 i/o expansion by ZBasic - Datasheet Preview

Datasheet Details

Part number	AN-203
Manufacturer	ZBasic
File Size	96.00 KB
Description	I/O Expansion
Datasheet	AN-203 Datasheet

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Full PDF Text Transcription (Reference)

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ZBasic AN-203 I/O Expansion Techniques Introduction Application Note On more complex 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 combination, 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.