YMF721 Datasheet, PDF (29/41 Pages) LSI Computer Systems – FM + Wavetable Synthesizer LSI

YMF721
Command 81h
Sub Command 00h : Get OPL4-MLx Information
Since the synthesizer of YMF721(OPL4-ML2) is the same as YMF295(OPL4-D), the character
string of "OPL4D" is obtained as described below.
Command
81h
00h
00h
Command byte
Sub Command
Check sum
Response
87h
4Fh “O”
50h “P”
4Ch “L”
34h “4”
44h “D”
00h
1Dh
Response 1st byte
ID Strings
Strings Last Code
Check sum
Command 82h
These commands are used to know information about the internal Wavetable sample ROM.
Sub Command 00h : Get Wave ROM Copyright Data
Command
82h
00h
00h
Command byte
Sub Command
Check sum
Response
9Eh
strings
Response 1st byte
Copyright Data
00h
Strings Last Code
46h
Check sum
This command is used to know capacity of internal processor. As the strings, character strings of
"copyright yamaha corporation"(28bytes) are returned.
Sub Command 01h : Get Wave ROM Version
Command
82h
01h
7Fh
Command byte
Sub Command
Check sum
Response
84h
01h
00h
03h
7Ch
Response 1st byte
Integer part of version number
First decimal place of version number
Second decimal place of version number
Check sum
This command is used to know version number of internal Wavetable sample ROM.
YMF704C(OPL4-ML) : Version 1.02
YMF721C(OPL4-ML2) : Version 1.03
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July 10, 1997