IBM 5280 Technical Newsletter page 145

993
COMMUNICATIONS ERROR TABLES
(continued)
Using the Display
I
Alter function to Display the
Communications Error Tables
The display
lalter
keyboard function permits you to
display, alter, and move the contents of main storage to
keyboard/display storage and the contents of keyboard/
display storage to main storage. In the following
procedures, only the display function is described. For
information about the other display/alter functions, see
the IBM 5280 Data Areas and Diagnostic Aids
Handbook.
To use the display/alter functions, you must use
keyboard 0, and the keyboard/display MPU must be
operational. While you are using display/alter, no other
keyboard/display operations can be performed.
Use the following procedures to display the communica-
tions error tables. If you are using a typewriter
keyboard, use the numeric key pad to enter the digits
o
through 9.
1. Perform the following steps to start the display /
alter function after IPL has completed:
a. Press the Cmd key.
b. Press the L key.
Once you start the display/alter function, you can
cancel the function at any time by performing the
following steps:
a. Press and hold the Shift key.
b. Press the E key.
c. Press the Reset key.
2. If you are using a single display, go to step 3. If you
are using a dual display or a keyboard with proof
arrangement or both, enter the following:
224
a. Press and hold the Shift key.
b. Press the C key.
c. Release the Shift key and enter one of the
following:
01 (nonproof arrangement keyboard and a dual
display)
10 (proof arrangement keyboard and a single
display)
11 (proof arrangement keyboard and a dual
display)
993
3. A line of data is displayed on the bottom of the
screen as follows:
o
0000 xxxxxxxx xxx ...
L
Loata (displaved in eight 4-bvte groups).
The address
~f
the first byte of data displayed.
The address
IS
set to 0000 when the displayl
alter function is first started.
The main storage page number of the data displayed.
The page number is set to 0 when the display/alter
function is first started.
4. Press the hold the Shift key and press the B key.
6. Release the Shift key and enter OOAO. (DO AD is
the address of the CCB pointer.) The CCB is then
displayed.
6. Press and hold the Shift key and press the 3 key.
7. Release the Shift key and enter one of the following:
a. 006C (to display the CCB error table [MPU
logged errors] )
b. 015C (to display the CAM error table [CAM
logged errors] )
c. The CCB Hex Displacement value from the CCB
Status Bytes and Counters Chart in this section
to display one of the status bytes or counters.
If you selected the CCB error table, it is displayed on the
screen as follows:
x xxx x
xxyyxxyy xxyyxxyy xxyyXXXX . . .
I
Five 2-byte error table entries, where:
xx = The error code (see CCB Error Codes).
yy = The number of times the error occurred.
Note: Also see the previous display example
in the beginning of this section (993).
Address of the first byte of the error table.
----Page number of the CAM partition.