YMF721 datasheet(29/41 Pages) LSI

29 / 41 page

YMF721

July 10, 1997

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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 82h

These commands are used to know information about the internal Wavetable sample ROM.

Sub Command 00h : Get Wave ROM Copyright Data

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

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

Command

Response

81h

Command byte

87h

Response 1st byte

00h

Sub Command

4Fh “O”

00h

Check sum

50h “P”

4Ch “L”

ID Strings

34h “4”

44h “D”

00h

Strings Last Code

1Dh

Check sum

Command

Response

82h

Command byte

9Eh

Response 1st byte

00h

Sub Command

00h

Check sum

strings

00h

Strings Last Code

46h

Check sum

Command

Response

82h

Command byte

84h

Response 1st byte

01h

Sub Command

01h

Integer part of version number

7Fh

Check sum

00h

First decimal place of version number

03h

Second decimal place of version number

7Ch

Check sum

YMF721 Datasheet(PDF) 29 Page - LSI Computer Systems

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