The game was originally written for the C64. This can be seen in the title screen (where the game refers to itself as CBM 64), as well as the part of the code marked "HANG" (meaning sound). Lines 550-560 would be playing a sound on the SID, but the POKEs have been changed to a "random" address, which does nothing on the C16/Plus4.
The game uses POKEs to write to the color memory, which is used when the player moves the cursor. These POKEs have not been converted properly, meaning the game will work, but the player must place their marker "blindly". Use the following to fix this:
890 POKE SP%+FB, 6 --> 890 POKE SP%-1024, 70
910 POKE SP%+FB, 5 --> 910 POKE SP%-1024, 5 |
