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A BriefDescription
The Radio Shack
TRS-80@
Model III is a ROM-based computer system consisting of:
..
A 12-inch screen to display results and other information
• A 65-key console keyboard for inputting programs and data to the Computer
..
A
Z-80
Microprocessor, the" brains"
of
the system
• A Real-Time Clock
• ReadOnly Memory
(ROM)
containing the Model III
BASIC
Language (fully
compatible with most Model I
BASIC
programs)
• Random Access Memory
(RAM)
for ?torage
of
programs and data while the
Computeris on (amount is expandable from
"16K"
to
"48K",
optional extra)
• A CassetteInterface for long-term storage
of
programs and data (requires a
separate cassette recorder, optional/extra)
• A PrinterInterface for hard-copy output
of
programs and data (requires a
separate line printer, optional/extra)
• Expansion area for upgrading to a disk-based system (optional/extra)
• Expansion areafor an
RS-232-C
serial communications interface (optional/extra)
All these components are contained in a single molded case, and all are powered via
one
power
cord.
Video Display Screen
Displayablecharacters include the standard
96
text-characters with the upper and
lowercase alphabet;
64
graphics characters; and
160
special
TRS-80
characters. In
addition, there are numerous control and space-compression characters. Some
of
the character sets can
be
switched in and outby
BASIC
andother programs.
Keyboard
The keyboard allows entry
of
all the standard text and control characters.
It
also
includes a 12-key section for convenient numeric entry. From the keyboard, you
can selecteitherall-capitals
or
upperand lowercase entry. The
(BREAK)
key is
designed to return control to you during any operation, including cassette
input/output
or
line printeroutput. Every key has an auto-repeat feature.
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