June 2014
Beginner to intermediate
208 pages
7h 14m
English
Content preview from Computer Interfacing
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The computer keyboard and VDU
A standard keyboard encoder
The General Instrument AY-5-2376 keyboard encoder is
an IC that has achieved some degree of acceptance as a
standard basis for the design of computer keyboards.
This LSI device is a 2376-bit read only memory that has
the capability to encode single-pole, single-throw key-
board closures into a
9-bit
code. The data and strobe
output are directly compatible with TTL or MOS logic,
thus obviating the need for any special interfacing.
Among the features found on it are:
(a) provision of external control for output polarity
selection,
(b) provision of external control for selection of odd
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