Preventing Conflicts with Non-PCI MPA Adapters

The multiprotocol adapters use system resources that, in some cases, cannot be shared. Therefore, you must make sure there are no conflicts with the following resources:
  • DMA level
  • I/O addresses (MPA0 uses X'380'–X'38F' and MPA1 uses X'3A0'–X'3AF')
  • IRQ level (ISA bus only)
The IBM® Multiprotocol interface adapters use the following system resources:
  • The ISA-bus SDLC adapters require the use of IRQ3 and DMA channel 1 and only the MPA0 communication port is supported.
  • The MPA for ISA can be supported using mode 4 (IRQ3 and DMA1 channel 1) or mode A (IRQ4 and DMA channel 1). IRQ level send/receive of 3 or 4 is supported. The ASCA can be supported using mode 4 (IDQ3 or IRQ5 or IRQ4 or IRQ7 and DMA channel 1) or mode A (IRQ4 or IRQ7 and DMA channel 1). IRQ level send/receive or 3, 4, 5, or 7 is supported. The interrupt level setting on the configuration panel in Personal Communications must match the value on the adapter card.
    Note:
    When the MPA is configured for mode 4, the device is not allowed to use the other IRQ even though only one interrupt is claimed.

    Personal Communications supports the MPA0 or MPA1 communication ports. Some sound cards use an I/O address within the range X'380'–X'38F'. MPA1 should be used to avoid a conflict.

  • The MPA/A for a microchannel-bus workstation uses IRQ3, and the DMA level can be configured. Both the MPA0 and MPA1 communication ports can be active at the same time and the interrupt is claimed as sharable.