Loading files

BIOS calls BIOSF_LOADFILE ($C00552) and BIOSF_LOADFILEX ($C00564) are used to load files from the CD.

The BIOSF_LOADFILE call displays a loading animation, while BIOSF_LOADFILEX (better name ?) doesn't.

Register A0 needs to point to a block indicating:

• The filename, ended by a 0 byte
• The bank number (8bit)
• An optional pad byte to align:
• Destination address (32bit)

The destination memory is automatically chosen according to the file's extension.

Rules:

• SPR files have 1MiB banks. PCM files have 512KiB banks. Other types aren't banked.
• FIX files and PCM files need to have their destination address multiplied by 2.

BIOS RAM adresses for currently loaded sectors, total sectors ?...