This is a nearly complete prototype for Donkey Kong Junior made
on the last day of 1983. This prototype only has a few minor
differences:
Differences
Some values in the lookup tables are
changed so Junior is able to climb the ropes on the
chain scene a few pixels higher in the released version.
The prototype contains additional 10 bytes of
code at $85d3 that appears to affect size of Junior's
hitbox in some way. One of the noticable affects
of this is that the birds on the spring board screen
will pass through Junior's bottom when he is at the very
top of a vine which does not happen in the released
version.