My first programming platform...BIGTRAK!
Even before I got my hands on my first HP calculator (pause for moment of reverence), I was tripping up my parents and scaring my dog awake from his afternooon naps with this ausome piece of machinery.
I still think the sound/light effects of the "plasma gun" firing has yet to be equaled. Not to mention the uber-cool 'dumping cart' acessory.
I first looked at the Mars rover sojourner;, I was proud to see that BigTrak had grown up.