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After each burn, the calculator display will show first the new
velocity and altitude, then the remaining fuel units, then will
count down to zero for you to key in another burn. This
sequence is repeated until you successfully land (when the
display will show you flashing zeros), or you smash into the
lunar surface (when the display shows you the blinking crash
velocity).
If you attempt to key in a fuel burn during any time other than
the one-second “fire window,” the rocket engine will shut off
and you will have to restart it by pressing
B
. Restarting
automatically uses up five units of fuel and gives no thrust.
So, press
A
now and try to land on the moon with your
HP-67.