Nintendo 64DD BIOS

The Nintendo 64DD was a Japan-only disk-drive peripheral that allowed memory expansion, Internet connectivity via RANDnet, and increased game storage capacity in addition to allowing games to be sold on magneto-optical disks. For various reasons, the 64DD was a market failure and plans to release it in the US were canned.

Audio Player
At offset is printf-formatted debug text, possibly for some sort of wavefile player used by the 64DD.

Romcopy %x -> %x ,size %x Romcopyend CPUPLAY %d, FX %d Start %x, %x PLAYLEN %d Terminate %d Out      %d DAC:Lost 1 Frame End Wave