I was 13 years old when me and my brother got our first computer from our parents. It was a Sinclair ZX Spectrum 48k which was the most popular European home computer at the time. The main characteristic of this machine was its size (it was pretty small) and the unique "dead flesh" keyboard where every button had several different functions depending on when the button was pressed.
The Spectrum had a built in BASIC interpreter which became active as soon as the machine
was turned on so the first time a button was pressed, a BASIC command was printed out
automatically, followed by the corresponding letter of that button (if it was pressed
again). Other functions or characters could be obtained by holding down special function
keys, similar to Ctrl and Alt on PC's today.
We used the TV as a screen and a tape recorder (without radio) for storage. This computer provided endless hours of gameplaying and also got me interested in programming BASIC and wanting to learn about computer technology in general. There are Z80 emulators for PC's to be found on the net which allow a regular PC to emulate and run old Spectrum programs but I haven't checked these out myself.