YMF744B Datasheet, PDF (15/60 Pages) List of Unclassifed Manufacturers – DS-1S

YMF744B
14-17h: Legacy Audio I/O Base Address (Dummy for SB, FM, MPU, D-DMA)
Read / Write
Default: 00000001h
Access Bus Width: 8, 16, 32-bit
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
IOBASE0
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I/O
b31 b30 b29 b28 b27 b26 b25 b24 b23 b22 b21 b20 b19 b18 b17 b16
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b0 ................IO
(Read Only)
This bit indicates that the base address is assigned to I/O. This bit is hardwired to “1”.
b[15:6] ........IOBASE0
This register is used so that the OS may secure I/O resources for Sound Blaster Pro, FM Synthesizer,
MPU401 and D-DMA controller. Because this register is a dummy one, each for the I/O addresses of
the above blocks is assigned with the I/O addresses set to 4C-4Dh and 60-65h respectively by the software
driver.
18-1Bh: Legacy Audio I/O Base Address (Dummy for Joystick)
Read / Write
Default: 00000001h
Access Bus Width: 8, 16, 32-bit
b15 B14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
IOBASE1
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I/O
b31 B30 b29 b28 b27 b26 b25 b24 b23 b22 b21 b20 b19 b18 b17 b16
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b0 ................IO
(Read Only)
This bit indicates that the base address is assigned to I/O. This bit is hardwired to “1”.
b[15:2] ........IOBASE1
This register is used so that the OS may secure I/O resource for the joystick port. Because this register is
a dummy one, the joystick I/O address is assigned with the I/O address set to 66-67h by the software
driver.
February 3, 1999
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