This book provides an introduction to interfacing various small microprocessors to external devices. The author discusses interfacing to buses, port and memory mapped I/O, serial and parallel data communication devices, and analog devices. There is some discussion of hardware counters and of simple interrupt handling schemes. However, there is nothing new in either the content or the approach.

There is no indication in the book of the intended audience. I suspect that it is aimed at the hobby market since it does not contain enough didactic material to be a textbook and is too elementary to be of use to a design engineer. The processors treated are the Z80, the 6800, the 6809, and the 6502. This excludes any discussion of properties that would be of interest to anyone designing a system with the current generation of microprocessors. There are examples of designing pieces of a system but no example of the design of a complete system.