IBM 3708 Description page 205

illustrates how the matrix entries define the printers and how local copy requests
should be handled.
In this example, "D" denotes a display port, "P" a printer port, "M" a
display-with-printer port (MLU), and "R" the host port. Ports I through 10 of a
3708 are attached to devices as follows:
Port Number 1 2 3 4 5 6 7 8 9 10
Device D D M M D D P P D R
The printer authorization entries for the printers result in the following table:
Printer Source Device List
Port Class Port No.:
1 2 3 4 5 6 7 8 9 10
Address Mode
70 71 72 72 ••.
Device: D D M M D 0 P P D H
07
Local
0 1 0
s ...
o
1 1 1 100 0 1 0
08
System
0 0 0
9 ...
o
0 0 0 0 0 0 000
03
Local
0 0 0
e •••
1 0 100 0 0 0 0 0
04
Shared
0 1 0
e •••
010 1 1 000 0 0
The display at port 1 copies only to the printer on port 3. This printer cannot be
addressed by class (class
=
all zeros). The displays on ports 2 and 5 use either the
printer on port 7 or the printer on port 4. The host can also use the printer on port
4
because its mode is shared. The display on port 9 is authorized to use only the
printer on port 7. The display on port 3 may copy to its attached printer (port 3) or
to the printer on port 7. Similarly, the display on port 4 may copy to its own printer
(port 4) or to the port 7 printer. The display on port 6 is not authorized to used any
printer as a local copy device. Also, the printer on port 8 is in system mode and
therefore reserved for exclusive use by the host.
Note: Source devices are associated with destination devices instead of classes. For
example, the user can define several printers in class 75, but may have authorized a
particular display only for a subset or none of the printers in class 75.
Printer IDs in the Status Line
The status line of the display contains the Print ID that is associated with the display
at any given time. This ID is used to select which printer a local copy request might
be serviced by when the PRINT operation is performed. The ID can be either a
class (70 - 85) or a printer port number.
A default Print ID is defined by the 3708 when the display begins its protocol
conversion session. The printer authorization matrix is used to determine the default
ID - the display associated with the printer with the lowest port number that the
display is authorized to use. The print ID will then be the lowest class number, if
the printer is a member of one or more classes, or the port number if the printer is
not a member of any class. If the display is not authorized to use any printer, the
ID is 00.
Note: When a display-with-printer device is involved in the print ID determination,
the printer portion is treated as if its port number were increased by 10. For
example, if a display is authorized to use a printer on port 4 (not a member of any
class), and the printer of a display-with-printer on port 3, its default print ID would
be 4. The port 3 printer is actually handled as if its port number were 13.
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IBM 3708 Description