SFX Test#
Programming exists for a disabled (or unfinished) sound effects test that was meant to be the fifth selection in the options screen, in place of EXIT. In fact, behind the scenes, pressing Left or Right while EXIT is highlighted will decrease or increase the RAM address reserved for the sound effect index. To restore access, have these game enhancer codes activated on boot up:
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Select a sound effect in the TUNE TEST, move the cursor down to EXIT, then press Left or Right to play the sound effect.
(Source: Denis (discovery), JLukas (codes))
Quiet#
An inaccessible entry exists in the TUNE TEST with the name QUIET, which silences the music. It's the final entry, located after GAME COMP.
Misc.#
The programming on the title screen checks a RAM address for the hex values representing the ASCII string BILL (presumably for programmer William Gibbs). This appears to be used for checking whether the title screen has finished loading or not.