Adapter location codes

The location code for an adapter consists of two pairs of digits with the format AA-BB, where AA identifies the location code of the drawer containing the adapter and BB identifies the I/O bus and slot containing the card.

A value of 00 for the AA field means that the adapter is located in the CPU drawer or system unit, depending on the type of system. Any other value for the AA field indicates that the card is located in an I/O expansion drawer. In this case, the AA value identifies the I/O bus and slot number in the CPU drawer that contains the asynchronous expansion adapter. The first digit identifies the I/O bus with 0 corresponding to the standard I/O bus and 1 corresponding to the optional I/O bus. The second digit identifies the slot number on the indicated I/O bus.

The first digit of the BB field identifies the I/O board containing the adapter card. If the card is in the CPU drawer or system unit, this digit is 0 for the standard I/O bus and 1 for the optional I/O bus. If the card is in an I/O expansion drawer, this digit is 0. The second digit identifies the slot number on the indicated I/O bus (or slot number in the I/O expansion drawer) that contains the card.

A location code of 00-00 is used to identify the standard I/O board.

Examples: