Determining Hardware Paths

The SPU on Series 925 through Series 949 systems, Series 958 systems, and Series 950 through Series 980 systems consists of the processor, memory, and I/O. Information is communicated through buses. A bus is a path over which information is transferred from any of several sources to any of several destinations. This is how data gets from the SPU to devices, and from devices to the SPU.

When you configure the system, you need to know hardware paths. When you add a peripheral to the system, such as a new disk drive or printer, you must supply a hardware path for the configuration. Hardware paths are a map used by the system when it configures the hardware. They allow the system to find a specific peripheral when only the LDEV or the device class is specified.

To recognize hardware path components

The components that make up the hardware path are shown in Figure 12-14 “Hardware Path Components”. A path for Series 925 through Series 949 systems and Series 958 systems consists of module slot number.device adapter.device. A path for Series 950 through Series 980 systems consists of bus converter/module slot number.device adapter.device.

Figure 12-14 Hardware Path Components

The components are described here:

• Bus converter number (Series 947 through Series 967 systems only) -

• Bus converter number (Series 950 through Series 980 systems only) - For midbus 0 use 2/ and for midbus 1 use 6/.

• Channel adapter module number - Four times the channel adapter card slot number (Series 925 systems and Series 950 through Series 980 systems). On the Series 935 system, the channel adapter card slot number is fixed at nine, so the channel adapter module number is four times nine, or 36.

• CIO device adapter slot number - The actual slot the device adapter card is in.

• Port or HP-IB/HP-FL address - The HP-IB/HP-FL address is set on the device itself.