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are possible, we think that one experiment should illustrate the basic<br />
principles. If you are interested in other decoder circuits, there are<br />
many different ones described in 8085A Cookbook, and Programming<br />
& Interfacing the 6502, With Experiments (Howard W. Sams<br />
Co., Inc., Indianapolis, IN 46268) . Actually, memory and I/ 0 deaddressing<br />
is pretty much the same, from one computer to the<br />
,'' 11'·"'" In most interface circuits, the decoder circuit that is used on<br />
interface breadboard will work quite well.<br />
While this book tackles Apple <strong>interfacing</strong> at a fairly low level,<br />
there are other important <strong>interfacing</strong> topics that you might wish to<br />
Many of these are covered in TRS-80® Interfacing, Book 2<br />
W. Sams & Co., Inc., Indianapolis, IN 46268) . The infor<br />
-,,,.ffm presented is fairly general, and it is easily applied to Apple<br />
compunr systems. Topics covered include: high-current, high-voltdriving,<br />
digital-to-analog and analog-to-digital converters,<br />
data processing (smoothing, filtering, averaging, etc.),<br />
communications, and remote control.<br />
The photograph in Fig. 6-1 shows a typical Apple-breadboard labstation<br />
that is used in performing the experiments in this<br />
A 40-conductor cable has been used to connect the breadand<br />
the Apple computer-Fig. 6-2. This cable has been de-<br />
" ,L,UU''-'"' in Chapter 5. When you connect the interface breadboard<br />
the Apple, be sure that the cable is oriented properly. The cable<br />
point away from the component side of the card used to conthe<br />
interface to the App'le. At the interface-breadboard end of
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