YMF721 Datasheet, PDF (28/41 Pages) LSI Computer Systems – FM + Wavetable Synthesizer LSI

YMF721
Sub Command 01h : Get Processor Software Version
Command
80h
01h
7Fh
Command byte
Sub Command
Check sum
Response
84h
02h
00h
00h
7Eh
Response 1st byte
Integer part of version number
1st decimal place of version number
2nd decimal place of version number
Check sum
Version number of firmware stored in the internal processor is read out as shown below.
YMF704B(OPL4-ML) : Version 1.22
YMF704B(OPL4-ML) : Version 1.23
YMF704C(OPL4-ML) : Version 1.24
YMF721C(OPL4-ML2) : Version 2.00
Sub Command 02h : Get Processor Software Capacity
Command
80h
02h
7Eh
Command byte
Sub Command
Check sum
Response
85h
00h
00h
00h
07h
79h
Response 1st byte
No use
No use
No use
Capacity code
Check sum
The capacity of internal processor can be known through the capacity code.
bit0 = 1 : The synthesizer is able to add effects such as reverb or chorus send level 1.
bit1 = 1 : Suspend/Resume is supported.
bit2 = 1 :Power down is supported.
YMF704B(OPL4-ML) : Capacity Code=01h
YMF704B(OPL4-ML) : Capacity Code=03h
YMF704C(OPL4-ML) : Capacity Code=03h
YMF721C(OPL4-ML2) : Capacity Code=07h
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July 10, 1997