IBM 5280 Technical Newsletter page 67

Page of SV31.oo00-1
As updated April 15, 1981
By TNL SN2()..9~
931
POWER-ON CHECKOUT AND IPL (continued)
Condition
Code In Hex
00
04
08
oc
10
14
18
1A
1C
1E
20
21
Description
The keyboard/display attachment has no data station attached.
The printer attachment, communications, or diskette feature is not installed or the
respective display checkout has been started.
The printer attachment, communications, or diskette MPU check is complete.
Main storage check complete: the printer attachment, communications, or diskette MPU
completed a write and read at the main storage address assigned to the attachment by the
main MPU microcode.
256-byte read/write main storage check complete: printer attachment, communications,
or diskette MPU completed a write and read of the first 256 bytes of main storage assigned
assigned to the attachment by the main MPU microcode.
The printer attachment, communications, or diskette attachment check is complete. The
diskette drive is attached to the diskette attachment but another diskette drive is doing an
IPL.
The printer attachment, communications, or diskette attachment check is complete. The
diskette drive is attached to the diskette attachment but another diskette drive is doing
an IPL.
VFO error.
The keyboard/display attachment has a data station attached.
Index pulses are too slow from the diskette drive attached to the diskette attachment.
Note: A diskette drive locking lever in the open position can also cause this condition.
The keyboard/display attachment has a dual data station attached.
The keyboard/display attachment has a data station attached and ready but the
timer is not working.
Index pulses are too fast from the diskette drive attached to the diskette attachment.
The keyboard/display attachment has a dual data station attached and ready but the
the timer is not working.
Erase mismatch: the diskette attachment write or erase gate was active during a read
operation, or write/erase sense was active during a read operation.
Storage overrun: the diskette MPU was unable to obtain the required storage cycles
to transfer the data.
931
Power-On Checkout and IPL 175