IBM 6151 Maintenance And Service Manual page 40

2-8
Service Manual
Number
Test description
21 An attempt is being made to do an IPL, using the devices
specified in the battery-powered memory.
22 An attempt is being made to do an IPL, using the default
devices specified in the ROM on the processor board.
23
None of the IPL devices specified in the battery-powered
memory or the ROM default list could be identified.
25
An error occurred during IPL. The system unit must be
powered off to clear this error.
26 An IPL operation is in progress.
27
The memory capacity was exceeded during IPL.
29 The IPL operation is beginning.
30 - 87 Individual adapter or device tests.
89 A machine or program check was detected.
Blank
This is the normal condition after the POST programs
complete.