YMF724F
42 - 43h: Extended Legacy Audio Control
Read / Write
Default: 0000h
Access Bus Width: 8, 16, 32-bit
b15
b14
b13
b12
b11
b10
b9
-
b8
b7
b6
b5
b4
b3
b2
SBIO
b1
b0
IMOD
SBVER
SMOD
-
MAIM
JSIO
MPUIO
FMIO
b[1:0] ..........FMIO: FM I/O Address allocation
These bits determine the base I/O address for the of the FM Synthesizer block (FMBase).
FM Synthesizer block uses 4 bytes in the I/O address space.
“0”:
“1”:
“2”:
“3”:
388h
398h
3A0h
3A8h
(default)
b[3:2] ..........SBIO: SB I/O Address allocation
These bits determine the base I/O address for the Sound Blaster Pro block (SBBase). This block uses 16
bytes in the I/O address space.
“0”:
“1”:
“2”:
“3”:
220h
240h
260h
280h
(default)
b[5:4] ..........MPUIO: MPU I/O Address allocation
These bits determine the base I/O address for the MPU401 block (MPUBase). This block uses 2 bytes
in the I/O address space.
“0”:
“1”:
“2”:
“3”:
330h
300h
332h
334h
(default)
b[7:6] ..........JSIO: Joystick I/O Address allocation
These bits determine the base I/O address for the Joystick block (JSBase). This block uses 1 byte in the
I/O address space.
“0”:
“1”:
“2”:
“3”:
201h
202h
204h
205h
(default)
b8................MAIM: MPU401 Acknowledge Interrupt Mask
This bit determine whether interrupt is asserted when the acknowledge, which is occurred by changing
MPU401 mode form default to UART, is returned.
“0”: Interrupt is asserted when the acknowledge is returned.
“1”: Interrupt is masked when the acknowledge is returned.
(default)
January 14, 1999
-19-
YAMAHA [ YAMAHA CORPORATION ]
