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Tetris DX is the only known example, displaying an alternate border. Wario Land II is notable for having a completely unused sound table listing.Īlternate enhancements can be given to games when played using a Super Game Boy 2 adapter, done by examining the internal value of the CPU's A register on start-up: 01 is for normal Game Boy or Super Game Boy and FF denotes Super Game Boy 2. Interestingly enough, roughly 60% of all Super Game Boy enhanced games have all of the commands in some form in their code at least, likely remnants of a tech demo or an SDK devkit. Several Super Game Boy command packets were never used by any commercially-released game, or never seem to have an actual effect on gameplay. The GB Memory cartridge sets FF right before making the JUMP to the selected game, so these settings are likely used to prepare the APU for the new SNES program code. Setting the music byte to either FE or FF will stop all Super Game Boy audio. Pressing X to switch palette settings in-game sets the song to address 00FA39? 00FA2F00 00FA3B44 (where "?" is 00-0F, varying per game and bank). This is necessary to allow games with Super Game Boy soundtracks to store more than two songs in ARAM (temporarily overwriting data in the Super Game Boy sound bank), preventing the APU from crashing when more than two are stored.
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The credits theme is padded from 02-0F, but only 02 is used. The clock speed is slowed down to match that of an actual Game Boy the first Super Game Boy's clock speed (and consequentially any games being played on it) ran slightly faster than a Game Boy's due to the clock speed being based on the SNES master clock.
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