My dad worked for National Semiconductor when he passed away in '84. I recall a few interesting calculators in his briefcase I kept (I should dig it out, actually).
My first try on this game was hard to beat.
Took me 18 tries before I finally landed on the moon at 52,42mph. “Crash Landing: You’ve 5hrs Oxygen”
Edit: Finally got 39.38MPH: “Craft Damage, Good Luck”
Edit: 34.34 MPH, “Craft Damage, Good Luck”
Edit: 16:3 MPH “Congratulations on a poor landing”
Edit: 10:41 MPH “Congratulations on a poor landing”
Edit: 9.75 MPH GOOD LANDING-(Could be better)*
EDIT Good grief.: 2.02 MPH GOOD LANDING-(Could be better)*
1.56 MPH, 69.48lbs fuel, GOOD LANDING-(Could be better)*
According to that BASIC source code, anything less than 10 was a beautiful landing? (line 510 & 570)… Or maybe that’s off by a decimal, as the javascript source says you need <1MPH for the one “Perfect Landing” I’m missing…
I’m heading to bed. 
