Requirements for ISA Devices

This section defines requirements if the audio device uses ISA. However, ISA is not a recommended solution for supporting audio in a PC 97 system.

16. Unique 16-bit address for I/O decode

As for all PC 97 devices, this is required for both onboard and add-on devices. For information, see the "Basic PC 97" chapter in Part 1 of this guide.

17. Minimum resource requirements

These are the required resource settings for ISA devices:

• 4 unique I/O locations

  Recommended: 7 I/O locations

• 4 unique IRQ signals

  Recommended: 7 IRQ signals

• 3 DMA channel selections, if DMA is used

  Recommend: 16-bit F-mode DMA

Note Type F DMA is strongly recommended for system-board audio implementations or for add-on devices that use ISA.

18. Unique IDs include Serial Number field for each ISA card

Unique IDs with Serial Number fields ensure correct support for multiple instances of the same device type. If unique serial numbers are not supported, the Serial Number field must contain 0xFFFFFFFF, as required in the ISA Plug and Play specification. For more information, see the "ISA" chapter in Part 3 of this guide.