The TRS-80 Sold by Radio Shack I bought for 800 dollars in 1978

 This was what I bought in 1978 when my son was 4 years old. two years later I remarried but had custody of my son and I taught my son and two step kids how to program in the Basic language and how to create games to play on the TRS-80. It only had 4k of memory that only worked when it was on but you could store your programs on a cassette tape and it could hold those programs to run them while it was on. But, when you turned off the computer everything was lost unless you stored it on a cassette tape then.

But, it didn't have a mouse because they were not available then. Steve Jobs bought the rights for the Mouse from a company (Xerox) who owned the rights and shipped the first computer with a mouse on the Apple computer. But, soon Microsoft added mouse software to their MS-DOS IBM Clone software.

partial quote from:https://en.wikipedia.org/wiki/Computer_mouse#History

In 1982, Logitech introduced the P4 Mouse at the Comdex trade show in Las Vegas, its first hardware mouse.^[34] That same year Microsoft made the decision to make the MS-DOS program Microsoft Word mouse-compatible, and developed the first PC-compatible mouse. Microsoft's mouse shipped in 1983, thus beginning the Microsoft Hardware division of the company.^[35] However, the mouse remained relatively obscure until the appearance of the Macintosh 128K (which included an updated version of the single-button^[36] Lisa Mouse) in 1984,^[37] and of the Amiga 1000 and the Atari ST in 1985.

end partial quote. 

Begin partial quote from:https://www.livescience.com/20718-computer-history.html 

The TRS-80, introduced in 1977, was one of the first machines whose documentation was intended for non-geeks (Image credit: Radioshack)

1977: Radio Shack's initial production run of the TRS-80 was just 3,000. It sold like crazy. For the first time, non-geeks could write programs and make a computer do what they wished.

1977: Jobs and Wozniak incorporate Apple and show the Apple II at the first West Coast Computer Faire. It offers color graphics and incorporates an audio cassette drive for storage.

Advertisement

1978: Accountants rejoice at the introduction of VisiCalc, the first computerized spreadsheet program.

1979: Word processing becomes a reality as MicroPro International releases WordStar. "The defining change was to add margins and word wrap," said creator Rob Barnaby in email to Mike Petrie in 2000. "Additional changes included getting rid of command mode and adding a print function. I was the technical brains — I figured out how to do it, and did it, and documented it. "