tty location codes
Location codes of 00-00-S1-00 or 00-00-S2-00 indicate
the tty device is connected to the standard I/O serial ports s1 or s2.
Any other location code indicates the tty device is connected to an adapter
card other than the standard I/O board. For these devices, the location code
format is AA-BB-CC-DD,
where AA-BB indicates
the location code of the controlling adapter card.
| Item | Description |
|---|---|
| AA | A value of 00 for the AA field
indicates the adapter card is located in the CPU drawer or system unit depending
on the type of system. Any other value for the AA field
indicates the card is located in an I/O expansion drawer. In this case, the
first digit identifies the I/O bus, and the second digit identifies the slot
number on the bus in the CPU drawer that contains the asynchronous expansion
adapter where the I/O expansion drawer is connected. |
| BB | The first digit of the BB field identifies the
I/O bus containing the adapter card. If the card is in the CPU drawer or system
unit, this digit will be 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
I/O bus (or slot number in the I/O expansion drawer) that contains the card. |
| CC | The CC field identifies the connector on the
adapter card where the asynchronous distribution box is connected. Possible
values are 01, 02, 03,
and 04. |
| DD | The DD field identifies the port number on the asynchronous distribution box where the tty device is attached. |