YMF721 Datasheet, PDF (27/41 Pages) LSI Computer Systems – FM + Wavetable Synthesizer LSI

YMF721
Supplementary Information 1 (about commands)
The following commands are used to check existence and identification of YMF704C/721(OPL4-
ML/ML2) by using device driver.
Command Sub Command Command Length Response Length
Function
80h
00h
80h
01h
80h
02h
81h
00h
3byte
3byte
3byte
3byte
11byte
5byte
6byte
8byte
Get Processor Device ID
Get Processor Software Version
Get Processor Software Capacity
Get OPL4-MLx Information
82h
00h
3byte
31byte
Get wave ROM Copyright Data
82h
01h
3byte
5byte
Get wave ROM Version
Command 80h
This command is used mainly to obtain version information of the internal processor. The device
driver is able to know capability of the internal processor before it controls the hardware.
Sub Command 00h : Get Processor Device ID
Command
Response
80h
Command byte
8Ah
Response 1st byte
00h
Sub Command
47h ”G”
00h
Check sum
4Dh “M”
50h “P”
5Fh “_”
ID Strings
4Fh “O”
50h “P”
4Ch “L”
34h “4”
00h
Strings Last Code
1Eh
Check sum
The character string "GMP_OPL4" is read from ID strings. Existence of YMF721 (OPL4-ML2) can
be confirmed with this character string.
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July 10, 1997