TRS-80

Long ago, a company called Tandy made a new computer.

It was called the TRS-80. It was one of the first computers for homes. People could buy it at Radio Shack stores. It had a keyboard and a screen. You could use a tape to save your work. It was very popular for schools and small shops. Many people loved this new machine.

In 1977, a company called Tandy released the TRS-80.

It was one of the first home computers sold to many people. You could buy one at a Radio Shack store. It used a Z80 microprocessor, which is a tiny part that runs the computer. The system came with a keyboard and a small screen.

It also used a cassette tape drive to save programs.

Many people wanted this new machine. By 1979, it had the most software choices on the market. It was so popular that it outsold the Apple II by five times. Some people even gave it a funny nickname. They called it the "Trash-80." Later, the company made newer versions like the Model III and Model 4. These new models worked with the old ones. The TRS-80 helped make computers a part of everyday life.

The TRS-80 was a special desktop microcomputer.

It was made by the Tandy Corporation. They sold it in their Radio Shack stores. This machine was one of the first home computers sold to many people. It helped change how people used technology at home. Many people called it the "Trash-80" as a joke. Later, the company called it the Model I to be clear. It was a very important tool for small businesses and schools.

The computer worked using a Zilog Z80 8-bit microprocessor.

This is the tiny part that acts like the brain. It used 4 KB of DRAM for its memory.

The system had a full QWERTY keyboard for typing. It also had a screen that showed 64 characters in each line. To save programs, people used a cassette tape drive.

The computer used a language called BASIC to run tasks. This language helped the machine understand instructions from the user. Users could even add more memory later to make it stronger.

Designing the TRS-80 was a big project for Tandy.

A man named Don French saw a computer kit and got an idea. He worked with John V. Roach to plan the machine. They hired a man named Steve Leininger to help with the technical parts.

Leininger wanted to sell a preassembled computer instead of a kit. He thought many people would find it hard to solder parts together. In February 1977, they showed a prototype to Charles Tandy. The first test even crashed when typing a large salary! They fixed it by adding better math support to the BASIC language.

The TRS-80 launched at a press conference in New York City. It cost $600 for the basic system. You could get a monitor and tape recorder for more.

People were very excited and many joined a waiting list. By 1979, it had the largest selection of software available. It was so successful that it outsold the Apple II by five times. Over 200,000 units were sold during its lifetime.

This computer was part of the "1977 Trinity" of machines. This group included the Apple II and the Commodore PET. The TRS-80 was easy to find because of Radio Shack stores.

These stores were in many small towns across the country. Later, Tandy made the Model III and the Model 4.

These new models were compatible with the older ones. The TRS-80 name eventually became a brand for many different computers. It helped lead the way to the computers we use today.

The TRS-80 Micro Computer System was a groundbreaking desktop microcomputer.

It was developed by the American Tandy Corporation. The company sold these machines through its Radio Shack retail stores. Launched in 1977, it was one of the first mass-produced home computers. It was part of what experts call the "1977 Trinity." This group included the Apple II and the Commodore PET. The TRS-80 was colloquially known as the "Trash-80." Later, the company renamed it the Model I to distinguish it from newer versions.

Technically, the system relied on the Zilog Z80 8-bit microprocessor.

This chip acted as the central processing unit for the machine. The standard configuration included 4 KB of DRAM, which is a type of short-term memory.

Users interacted with the computer through a full-stroke QWERTY keyboard. The video monitor displayed 64 characters per line.

To store programs, the original package included a cassette tape drive. The system also featured a Level I BASIC interpreter stored in ROM. BASIC is a programming language that allows users to give instructions to the computer.

Users could expand the basic system to increase its power. The RAM, or random access memory, could be upgraded to 48 KB.

The system also supported up to four floppy disk drives or hard disk drives. This expansion allowed the machine to handle more complex data. However, the Model I had some technical difficulties. These included keyboard bounce issues and a troublesome Expansion Interface. The process of loading and saving data via cassette tapes was also considered difficult. Until 1981, the machine lacked support for lowercase characters. This limitation sometimes made it harder for businesses to adopt the technology.

The development of the TRS-80 began in the mid-1970s. Don French, a Tandy buyer, began designing a computer after seeing a MITS Altair kit. He worked with John V. Roach, the vice president of manufacturing. They eventually hired Steve Leininger to provide technical expertise. Leininger had experience with the SC/MP microprocessor. While some at Tandy wanted to sell a computer kit, Leininger argued for a preassembled machine. He believed many people would find soldering parts together too difficult. In February 1977, they presented a prototype to Charles Tandy. During this test, the computer's Tiny BASIC implementation crashed. It could not process a large number when Charles Tandy typed in a salary. The team quickly added floating-point math support to the Level I BASIC to fix this.

Radio Shack announced the TRS-80 at a press conference in New York City on August 3, 1977. The basic system had a starting price of US$600.

This was a significant price for the time. Despite internal skepticism from executives, the public response was massive. After the announcement, 15,000 people called to purchase the unit. This volume of calls actually paralyzed the company's switchboard. Additionally, 250,000 people joined a waiting list with a $100 deposit. By the end of its lifetime, the company sold over 200,000 units. This success helped change the image of Radio Shack from a retailer of small electronics to a major computer provider.

The TRS-80 was a massive commercial success compared to its rivals. By 1979, it possessed the largest selection of software in the microcomputer market. An analysis showed that the TRS-80 outsold the Apple II by a factor of five until 1982. By 1981, InfoWorld described Radio Shack as the dominant supplier of small computers. The company used its thousands of stores to provide full-service support. Customers could receive upgrades, repairs, and training at local Radio Shack locations. This massive distribution network gave Tandy a huge advantage over competitors who lacked such widespread retail presence.

The product line evolved through several different models. In mid-1980, the company released the TRS-80 Model III, which was broadly compatible with the original. The Model I was discontinued shortly after, partly due to stricter US FCC regulations regarding radio-frequency interference.

In April 1983, the Model III was succeeded by the TRS-80 Model 4. Eventually, the name "TRS-80" became a generic brand for many unrelated products. These included the Model II, the Model 2000, the Model 100, the Color Computer, and the Pocket Computer. This evolution shows how one successful machine can lead to an entire family of different technologies.