Hello, I surfed the net for some informations about Soundhardware and found an interesting PPT file which has a very interesting information on Page 20 with following readings…:
Yamaha FM registers in apparently random order (like Japanese House numbers)
Bug found by Williams/Watts in 1985 in YM3526
Did a workaround so quick time to market for Commodore computers
Bug found again by Linux programmers when trying to emulate Soundblaster registers
2004 - OPL2 core now integrated into the South Bridge of the motherboard’s chipset
Bug now in every PC? (>1 Billion?)
The twenty-two registers (20-35, 40-55, etc.) have an unusual
order due to the use of two operators for each FM voice.
Channel 1 2 3 4 5 6 7 8 9
Operator 1 00 01 02 08 09 0A 10 11 12
Operator 2 03 04 05 0B 0C 0D 13 14 15
you can find the PPT here: http://research.microsoft.com/users/lyn/soundcardhistory.ppt
I just wanted to know if this bug even exist in the opl3 used in the MIDIBOX FM?
Thanks a lot… I am building it at the moment… also a SID Module…
Greets and Thumbs up for the good work!
You will find these addresses in the specification, and MBFM uses translation tables based on this spec in order to address the operators correctly.