HP 9020 CE Handbook page 59

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9020 Diagnostics
BAD Io BUS: NNNNN
BAD Io BUS: SELECT CODE NN
- Indicates a computer hardware failure on the computers first lOP.
BAD NVM: NNNNN
BAD NVM: SELECT CDDE NN
- Indicates that Non-Volatile Memory failed its self-test. Possible cause: computer hardware fail-
ure.
BAD RTC: NNNNN
BAD RTC: SELECT CODE NN
- Indicates that the built in Real Time Clock is not operating correctly.