Radio Shack TRS-80 Model III - Page 12

TRS-80
MODEL
til
Z-80
Microprocessor
This is the
central processing
unit—
where all the "thinking"
is done. In
the Mode!
Ill, the
microprocessor
operates at a
speed of over two million
cycles
per second.
Read Only
Memory
(ROM)
This
is where
the Computer's
built-in programs
are stored,
including
the
TRS-80
BASIC language.
TRS-80
BASIC is fully
compatible with
the Level II
language
used in
Model I
TRS-80's. Each time
you power-on
the Computer,
this
ROM program
takes
charge of
the microprocessor,
enabling
you to
type in simple
BASIC-language
instructions.
The Model
III contains
a "14K"
ROM, meaning
it contains
14*
1024
=
14336
characters
(
'
'
by
tes
'
'
)
of permanently
programmed
memory
.
Random
Access
Memory
(RAM)
This is
where your
programs and
results are
stored while
the Computer
is on
. It is
erased when you
turn the
Computer off.
The Model III can
be equipped with
16K, 32K or48K
of RAM
(IK
=
1024
bytes).
Peripherals
These are devices
you can
add to your
Computer to increase
its
usefulness
in
programming and
data
storage. The
Model III contains
the
necessary
"interfaces"
to
simplify
the addition of
many peripherals.
Cassette
For long-term
storage of
programs
and data, simply
connect a
cassette recorder
to
the Computer,
and
save the information
on tape.
For
program storage,
you may
select either
High or
Low transfer
rates
(use Low
for
compatibility
with
Model I,
High for
faster saves and
loads).