IBM PS/2 90 XP 486 Hardware Maintenance Reference page 59

IBM PS/2 Model 90 XP 486 and 95 XP 486 HMR
Error Messages
7.2.2 Error Messages
If you get a 161 or 173 error during POST, the selection you made in the
Set Console utility program is no longer valid. When this happens, the
system will look for a video adapter. If it finds one, the keyboard and
display will be used as a console. If it does not find one, the ASCII
terminal will be used as a console.
¦ Copyright IBM Corp. 1990, 1992
7.2.2 - 1