Believe Nothing Question Everything
This is was my first computer the Tandy TRS-80
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Announced at the press conference in
August 3, 1977, the Tandy TRS-80 Model I was Tandy's entry into the home
computer market, meant to compete head on against the Commodore PET
2001 and the Apple II.
Company management was unsure of the computer's market appeal, and
intentionally kept the initial production run to 3,000 units. Tandy
ended up selling 10,000 the first month and 55,000 its first year.
Before its January 1981 discontinuation, Tandy sold more than 250,000
User data was originally stored on cassette tape. The cassette tape
interface was extremely sensitive to audio volume changes, and the
machine only gave the very crudest indication as to whether the correct
volume was set, via a blinking character on screen when data was
actually being loaded - to find the correct volume, one would sometimes
have to attempt to load a program once adjusting volume until the
machine picked up the data, then reset the machine, rewind the tape and
attempt the load again.
To upgrade to a floppy disk based system the owner had to buy the "Expansion Interface".
There were two versions of the BASIC programming language produced for
the Model I. Level I BASIC fit in 4K of ROM, and Level II BASIC fit into
12K of ROM.
SPEED 1.77 MHz
RAM 4 kb / 16 kb depending on models (up to 48 kb)
VRAM 1 kb
ROM 4 kb (Basic Level 1) or 12kb (Basic Level 2)
TEXT MODES 32 x 16, 64 x 16
GRAPHIC MODES 128 x 48
I/O PORTS Monitor, cassette interface, expansion port
OS TRS DOS - NEW DOS
NAME TRS 80 MODEL I
MANUFACTURER Tandy Radio Shack
TYPE Home Computer
BUILT IN LANGUAGE Basic Level 1 (4k ROM models)
Basic Level II (12k ROM models)
KEYBOARD Full-stroke keyboard, 53 Keys, optional numeric keypad
CPU Zilog Z80