Comment geos (Score 1) 654
my first gui was geos on a c64, it wasn't mine and i didn't use it for too long. since this c64 had no mouse you controlled the cursor with the joystick. i was kind of impressed by it (first time ever seeing a gui, can you imagine), even though it was mono colored. perhaps some apps were able to use/display colors, the interface certainly wasn't.
though i voted for amiga, because it was the first gui capable machine i owned and it had an amazing gui (by todays standards not so much). the main thing was ofcourse the amazing multitasking the amiga was capable of within this gui.