Condition Code Tabh!For Power-On Checkout And Ipl Failures - IBM 5280 Technical Newsletter

r G!:jC U I ~
T ,) I -UOUU- I
As updated April 15, 1981
By TN L SN20-9588
931
POWER-ON CHECKOUT AND IPL
(continued)
Condition Code Table for Power-On Checkout and IPL
Failures
Use the displayed condition codes to
det~rmine
the type
of failure that occurred during a power-on checkout and
IPL operation. To force a condition code display, leave
the diskette locking lever of the drive containing the IPL
diskette open. The scan code for any pressed key can
now be observed on the display.
If the L key is the first key pressed at any time during
,the power-on checkout and IPL sequence, the display/
alter function is started (991). To terminate the
display/alter function, a power-on checkout and IPL
must be done (turn the Power switch off and then on).
The keyboard scan code is displayed in hexadecimal for
each key pressed during power-on checkout. Entry 1yy
is for keyboard 0, entry 2yy is for keyboard 1, and so on.
I
1
, ,
lyy 2yy 3yy 4yy
z r z r
*
00 00 00 00 00 00
zrxx zrxx zrxx zrxx
0000 0000 0000 0000
0000 0000 0000 0000 0000 0000 0000 0000
zrxx zrxx zrxx zrxx zrxx zrxx zrxx zrxx
0000 0000 0000 0000 0000 0000 0000 0000
zrxx
0000 0000 0000 OOOG 0000 0000 0000
zrxx
0000 0000 0000 0000 0000'0000 0000
'-r
/
z MPU number assigned by the microcode.
xx
*
174
MPU ROS engineering change and patch level.
These numbers are generated by the microcode
but are not used during normal maintenance
procedures.
Device condition in hexadecimal. See the table on
the next page for the meaning of each entry.
Present only if the feature main MPU is installed.
931
To terminate a scan code display function, close the
diskette locking lever; the power-on checkout will
continue.
The format of the display is as follows (the line positions
are inverted for displays on the IBM 5282 and the IBM
5286):
- -
- Line 1-Keyboard scan codes
Line 2-Mai n MPU status
- Line 3-Reserved
-
-
• •
-
• •
•
Line 4-Keyboard/display MPU status
Line 6-Reserved
Line 6-Diskette MPU/drive status (drive 40 on
left through 5C on right)
Line 7-Reserved
Line 8-Printer attachment MPU status
Line 9-Communications MPU status