YMF724F

September 21, 1998

-19-
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 b1 b0
IMOD SBVER SMOD - - MAIM JSIO MPUIO SBIO FMIO
b[1:0]..........FMIO: FM I/O Address allocation
These bits determine the base I/O address for the of the OPL3 block (FMBase). OPL3 block uses 4
bytes in the I/O address space.
“0”: 388h (default)
“1”: 398h
“2”: 3A0h
“3”: 3A8h
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”: 220h (default)
“1”: 240h
“2”: 260h
“3”: 280h
b[5:4]..........MPUIO: M PU I/O Address allocation
These bits determine the base I/O address for the MPU401 block (MPUBase). T his block uses 2 bytes
in the I/O address space.
“0”: 330h (default)
“1”: 300h
“2”: 332h
“3”: 334h
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”: 201h (default)
“1”: 202h
“2”: 204h
“3”: 205h
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. (default)
“1”: Interrupt is masked when the acknowledge is returned.