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Servicing Personal Computers, 3rd Edition
book

Servicing Personal Computers, 3rd Edition

by Michael Tooley
May 2014
Intermediate to advanced content levelIntermediate to advanced
320 pages
13h 41m
English
Newnes
Content preview from Servicing Personal Computers, 3rd Edition
Microcomputer systems 49
Φ2
RES
System clock phase 2. Data transfers only take place when Φ2 is
high.
This signal also
provides the timebase for the VIA timers and shift registers.
Clears all internal registers (to logic 0) except for those associated with the shift register and
timers. Also disables all interrupts emanating from the VIA.
Keyboards
As an example of the use of PIA devices, we shall now consider the operation of a typical
keyboard decoding arrangement. On most microcomputers, the keyboard consists of a matrix
of 60 or more switches, with the possible addition of further switches reserved for specific
functions. The main keyboar ...
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Publisher Resources

ISBN: 9781483193670