Mine was the Vic20. Currently working on a new game for it as it happens. :)

Mine was a Vic20, with a whopping 5K of RAM, of which 3.5K was available to program with (the rest being for BASIC/Kernal in the Zero Page and for the screen). It had a decent keyboard, lots of ports to be expanded (thankfully 16K RAM expansions were common, but expensive) and it was immediate - at the READY prompt to start to do anything you wanted...usually loading a tape but the wait time was not too bad for 3.5K programs ;) I'm just finishing a new Vic20 game in machine code right now called Vic Nibbler. Should have a version out at the weekend. Reliving the 80's! Find out more on: https://www.facebook.com/Hewco64[^] or https://hewco.uk