===== 14 REG SPU REGISTERS | BIOS 19951204 System ROM Version 3.0 11/18/96 A
BadVaddr as the group starts: 00000480
1DBCh-1DBFh and 1E60h-1E7Fh (spx:1108-1121), written and read back, put back.
1DBCh DFFF F7FF, 1E60h..: F5FF F3FF BFFF 29DF 74BB FFFE BFF7 FFEF FFFF FD7D 6EFF 3BF3 FC7F FFFF BFFF 7D8F
Unknown 1DBC: was DFFF, write 1234 reads 1234
Unknown 1DBE: was F7FF, write FEDC reads FEDC
1E60h.. written inverted, reads: 0A00 0C00 4000 D620 8B44 0001 4008 0010 0000 0282 9100 C40C 0380 0000 4000 8270
Unknown 1DA0h 1DA0: was AC00, write 5A5A reads 5A5A
Voice 5 registers written FFFFh:
 volume L 1C50: was 0000, write 7FFF reads 7FFF
 volume L sweep 1C50: was 0000, write FFFF reads FFFF
 pitch 1C54: was 1000, write FFFF reads FFFF
 start 1C56: was 4000, write FFFF reads FFFF
 ADSR low 1C58: was 000F, write FFFF reads FFFF
 ADSR high 1C5A: was 1FC0, write FFFF reads FFFF
 repeat 1C5E: was 4000, write FFFF reads FFFF
Voice flag registers (bits 24-31 not used, spx:660, :666, :683; PMON bit 0 :382):
 PMON low 1D90: was 0000, write FFFF reads FFFF
 PMON high 1D92: was 0000, write FFFF reads FFFF
 NON high 1D96: was 0000, write FFFF reads FFFF
 EON high 1D9A: was 0000, write FFFF reads FFFF
 ENDX high 1D9E: was 00FF, write FFFF reads FFFF
 CD volume L 1DB0: was 0000, write 8765 reads 8765
 extern volume R 1DB6: was 0000, write 8765 reads 8765
 reverb volume L 1D84: was 0000, write 8001 reads 8001
 mBASE 1DA2: was FFFE, write 1234 reads 1234
Main volume L sweep A020 reads A020, current main volume 1DB8h 0000 0000
32-bit stores to 1C58h, 32 tries: low half wrong 7, high half wrong 0
1C58h lw 1357ABCD, lbu 1C58h CD 1C59h AB 1C5Ah 57
sb 12345678h to 1C54h: 5678; to 1C55h over 1111h: 1111
Done.