If it were necessary for one to master the chemistry and physics
involved in the manufacture of molybdenum-steel piston rings
before one could undertake any sort of automobile repair, there
would be far fewer backyard mechanics in the world. Happily,
this is not the case. After mastering some basic skills and con-
cepts, one need only to consult the appropriate ~how-to-repair"
mandal for the particular automobile involved to affect even
complex repairs. The automobile industry is, of course, a fully
mature one, so there has been time to prepare all types of help-
ful documentation for mechanics as well as automobile engi-
neers. This is not the case with the emerging and dynamic field
of microcomputer-based electronic equipment maintenance.
.~ As I write this, the basic ~cpu-on-a-chip" has only been
commercially available for slightly longer than a decade; its low
cost, flexibility, and tiny size have already enabled true com-
puter power to be added to even such banal applications as the
kitchen toaster, while at the same time a vast variety of so-
phisticated electronic products have become part of our daily
lives. Why then, do almost all books written on the subject of
microcomputer technology still treat the matter as one for re-
search scientists and design engineers?
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