The results of the Power On Self Test are recorded here. The value read is a bit mask of possible errors, these are as follows:- bit 3 set - error accessing the Ethernet Address PROM bit 5 set - error accessing System RAM bit 6 set - error accessing NVRAM bit 7 set - battery level low bit 8 set - MFP errors bit 9 set - LANCE errors bit 11 set - error allocating unit ids to units bit 12 set - error on acessing repeater bit 13 set - as above bit 14 set - as above bit 15 set - as above bit 16 set - as above bit 17 set - error accessing processor bus bit 2 set - error accessing the Ethernet Address PROM bit 3 set - error accessing System RAM bit 4 set - as above bit 5 set - error accessing NVRAM bit 6 set - battery level low bit 7 set - MFP errors bit 8 set - LANCE errors bit 9 set - MBGA errors bit 10 set - watchdog bit 11 set - error allocating unit ids bit 12 set - error on acessing repeater bit 13 set - as above bit 14 set - as above bit 15 set - as above bit 16 set - as above bit 17 set - as above bit 18 set - hardware bus error bit 19 set - as above bit 20 set - as above bit 21 set - as above bit 22 set - interrupt error bit 23 set - as above bit 24 set - unknown