KEY
BOARD
CONTXOLLER
The keyboard controller (Figure
7-71
is
a
12
button calculator-type
switch
array that
functions like
a
small computer keyboard. When one of
the
pushbuttons is pressed, the
corresponding set
of
sense lines is closed, completing the circuit. The closure is
detected by
the
6532
and appropriate action is taken by the program. Figure
7-8
illustrates the keyboard wiring
and
Figure
7-9
the keyboard schematic.
Figure
7-7.
Keyboard Controller
2500/2600A
Domestic
VCS
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