Atari 65XE Personal Computer / got this one somewhere in late 80’ties from Pewex store, spent (wasted?) hours retyping the many, many lines of BASIC code and watching in awe when nothing happened because of a typo or I succeed to get an infinite loop. Also wasted tons of hours playing Pitfall II (that music! Not the “lost caverns” by Sega, but original by Activision – this one ), broken few joysticks, taught my mom how to play Boulder Dash & watch her waste hours playing Robbo.
I need to clean it… :P