This recently discovered version of Rockball appears to be
the same as the cartridge labeled Final but has a lot of code at
the beginning of the rom zeroed out. It is currently unknown
what this missing code does, but the game appears to play exactly
the same. Although Joe Hellesen's name is on disk, he is not
the programmer for Rockball. This disk is thought to be his
personal copy of the game.
Notice how the disk says 2I in corner? This was part of a
version numbering scheme that the programmer used. Each
revision was given a letter from A-Z and when he reached the end
he started over but added a number in front of the letter.
Although this means that version should be from 7/14/83 it's
obvious a much later version. This is due to the disk most
likely being reused.
Kaboom!
Sometimes you have to go
chase down the rockballs yourself