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YMF715E
May 21, 1997
-14-
2. ISA Interface
OPL3-SA3 supports ISA Plug and Play (PnP) that frees the users from configuring the I/O address,
IRQ and DMA channel. Those system resources are set automatically by the system. However even
when used in Non PnP system, the configuration can be changed with software.
2-1. PnP Auto-Configuration mode
OPL3-SA3 has the following I/O port to support the Plug and Play ISA.
Address port: 279h
Write Data Port: A79h
Relocatable Read Data Port: 203h - 03FFh
The following four Logical Devices are supported by OPL3-SA3.
Logical Device No. 0
Sound Blaster compatible Playback system (SB Base)
16-bit CODEC (WSS Base)
MPU401 (MPU Base)
OPL3 (AdLib Base)
OPL3-SA3 control register (CTRL Base)
Logical Device No. 1
Joy Stick
Logical Device No. 2 (Optional)
MODEM (COM port)
Logical Device No. 3 (Optional)
IDE CD-ROM interface