Here’s what was special about it.

After the introduction of the Model II later, this first model became known as the TRS-80 Model I.

In 1977, the TRS-80’s $599.95 price was a big deal.

The TRS-80 Model I computer on a 1970s-colored background

Steven Stengel / Benj Edwards

But you always get what you pay for: The original TRS-80 was a fairly primitive machine.

Translate the name as “Tandy Radio Shack Z-80,” and it makes sense.

To this day, the Trash-80 nicknamestill bothersTRS-80 fans, so it’s not a kind or endearing name.

The TRS-80 Micro Computer System in a Radio Shack catalog, 1977.

Radio Shack

What Was It Like to Use a TRS-80?

When you purchased a TRS-80 Micro Computer System, you had everything you needed to write and store programs.

With the included cassette drive, you could load or save data to an ordinary audio cassette tape.

A kid using a TRS-80 computer near a Christmas tree with its parents looking on.

Radio Shack

You could also purchase software on cassette or floppy disk for your Model I computer.

Still, the TRS-80 has sort of a middling-to-lackluster reputation compared to other early PCs like theApple II.

He says that its lukewarm reputation is a misunderstanding, partially due to the computer’s nickname.

Part of an  for the TRS-80 Model I that appeared in November 1977 issue of Byte magazine.

Radio Shack

Of these, only the TRS-80 Model III and Model 4 series were backward-compatible with the Model I.

The Model II started its own parallel branch, as did the TRS-80 Color Computer series.

As for the TRS-80 Model I?

A man using a TRS-80 on a desk. Part of an  for the TRS-80 Model I that appeared in November 1977 issue of Byte magazine.

Radio Shack

But it still had a huge impact and made a lot of fans along the way.

Happy Birthday, TRS-80!

Related:40 Years Later: What Was it Like to Use an IBM PC in 1981?