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YMF724F
September 21, 1998
-29-
2-1. OPL3 Block
OPL3 Block is register compatible with YMF289B. However, Power Management register has been
deleted because it is now controlled by the PCI Configuration Register.
The following shows the FMBase I/O map of OPL3.
FMBase (R) Status Register port
FMBase (W) Address port for Register Array 0
FMBase+1 (R/W) Data port
FMBase+2 (W) Address port for Register Array 1
FMBase+3 (R/W) Data port
The default FMBase value is 0x0388.
The following shows the OPL3 Block registers.
2-1-1. Status Register
OPL3 Status Register (RO):
AddressD7D6D5D4D3D2D1D0
xxh IRQ FT1 FT2 - - BUSY - BUSY