HP 1000
Interface Card | Interface Card |
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Select Code 30 | Select Code 31 |
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| LU 20 |
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| LU 23 |
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Figure 61. Example Node List Configuration
Interrupt Table
The interrupt table contains information that specifies what the system is to do when an interrupt comes from any select code. It allows special handling of all interrupts from specified devices.
Typically, the interrupt table entry for a particular select code would reference the IFT for that select code. This link is generated automatically by RTAGN. This means that only in the special case when the interface driver is not to be called to service an interrupt, must an entry be specified for this table in the generator command file.
The System I/O Configuration Worksheet
A blank I/O configuration worksheet is given in Appendix B of this manual. Proper completion of the worksheet will ensure that your LU numbers, select codes, HewlettPackard Interface Bus (HPIB) addresses, and Small Computer System Interface (SCSI) addresses have been assigned correctly. An example I/O configuration worksheet is shown following this section.
In the first column, list all of the peripheral devices that are to be connected to your system. List the HPIB itself, as well as the devices on the bus. In addition, make one entry for each disk logical unit that you will include in your system, even though several disk LUs may be located on the same physical disk drive.
On each line in the second column, enter the interface card that will be used by the device in the first column.
In the third column, enter the logical unit number of each device. The LU number is the reference number to the device. LU numbers may be in the range of 1 to 255 (decimal) and each device must have a unique LU number. This includes the HPIB itself, as well as the devices on the bus. Even if you have no need to access the bus interface card directly, some system utilities may try to access the card, and will fail if an LU number has not been assigned.
In the fourth column, enter the select code for each interface card. The select code is the address of the interface card in the same way that the LU number is the address of a device. Select codes
Table Generation Phase 63