Vic20... I had a 16K memory cartridge and a tape drive. Tried to create my own basic adventure game - then ran out of memory. There wasn't enough RAM on the box to hold the potential character inventory. Eventually the transformer in the back right of the unit melted down a bit and separated ever so slightly from the main board. I found that a 10 pound lead window weight perched on the back right corner of the Vic20 console would force contact and keep it alive. It probably acted as a pretty effective heat sink too. Good times.