PEOPLE Main Unit
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L
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Most of the electronics are
located in the basic version on
two printed circuit boards. It oper
ates on the
INTEL 8086,
a 16-bit
microprocessor. A microprocessor
is one of the principal compo
nents of a microcomputer. It is
usually a single silicon chip (in
tegrated circuit), containing
microscopic switches used to
register the presence or absence
of electronic information. It
“ handles” all the instructions to
and from the central processing
unit.
The main unit contains two 51/2
inch floppy disk drives, each with
a 655K byte capacity. Disk drives
are the two slots in the front of
the main unit. They are used to
read data from or write data to
the diskettes. You’ll find a com
plete description of diskettes in
Section 2.
A parallel and an RS 232C serial
interface are also provided in the
base unit. Interfaces are devices
which contain the electronic
circuits necessary to physically
connect the microprocessor to
another device, such as a key
board or printer.
A parallel interface transmits all
the data bits simultaneously over
separate data paths, whereas a
serial interface transfers data
items one after another in
sequence over a single data
path. Parallel operation is faster
but requires more equipment and
is limited in distance, while serial
operation is slower, but can travel
further across communications
lines.
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Summary of Contents for People
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