That is, what was the first electronic system you gave a series of instructions to, that it then followed out?
The first one for me was the Big Trak:
Which you could program to go forward or backward, turn, fire its weapon, or, if you had the optional Big Trak Transport, tell it to dump its load.
After that, I believe the next thing was Atari 2600's BASIC Programming (big disappointment!), then a Heathkit computer we had at school (I typed in a Lunar Lander program), and then finally the Atari 400 with Atari BASIC.
How about you?