3 Atari 800/800XL
The Atari 800XL, as the successor of the Atari 800 computer was presented in a in a more compact and modern looking case. Almost all of the same software, would work on it as long as the programs were coded correctly this was due to some minor differences between OS versions.
The 800XL had 64 KB of RAM, two joystick ports and retained the custom chips (Pokey, GTIA, Antic) found in the previous 800 model. The XL featured the new Parallel Bus Interface (PBI) which provided high speed access to the system bus.
The Antic chip ( a newer graphics chip ) offered 16 graphics modes instead of 12 for the 800.
The Atari 800XL was one of the most popular home computers alongside the likes of the C64. Eventually Atari ditched the 8-bit range of computers when they launched the 16-bit Atari ST.
4 BBC Micro
In 1980 the BBC decided to start a computer literacy television series. The BBC called for bids to produce a computer. Acorn and Sinclair Research, along with other companies, submitted thier designs, and Acorn won. Initially Acorn produced the Proton which was later renamed the BBC Micro.
The computer was noted for it's build quality, rugged design and well designed operating system. The BBC featured on the BBC2 the "Computer Programme" that featured Chris Serle where he learned how to use the machine.
The BBC micro was very popular and many schools used the BBC Micro. It was followed in 1982 by the BBC model B. The Model B had the same features but had 32 KB of memory which was expandable up 64KB.
Acorn also made a cheaper more basic version of the BBC called the Acorn Electron. The BBC micro was used in schools into the early 90's. Some are still in use today.