Editing Acorn Archimedes A3020 Troubleshooting Guide (section)

== Battery, clock and configuration ==

* '''Clock wrong / configuration lost / drops to the Supervisor prompt''': flat or leaked NiCd cell not holding CMOS. A healthy cell reads roughly 3.4–3.6 V at rest; below about 3.6 V it drains too quickly.<ref name="stardotbatt">[https://stardot.org.uk/forums/viewtopic.php?t=7790 "CMOS battery voltage"], Stardot forums.</ref> Replace the cell (see the [[Acorn Archimedes A3020 Maintenance Guide]]).
* '''"Not enough memory in module area" or random CMOS resets''': same cause — a weak cell.<ref name="stardotbatt" />
* '''0x10000 POST fault (CMOS unreadable)''': the PCF8583 RTC or its tracks have been destroyed by leakage; repair tracks and replace the chip.<ref name="retrorr">[https://retrorepairsandrefurbs.com/2024/09/27/1992-acorn-archimedes-3010-repair-restoration/ "Acorn Archimedes repair"], Retro Repairs and Refurbs.</ref>