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If the CMOS becomes corrupted in the IBM PS2 55SX you can run the REFERENCE disk, run FDISK, FORMAT, or any other number of diagnostics, and the system will still fail to boot from the hard drive. You can boot with a floppy and examine the hard drive without trouble. It's necessary to clear the CMOS and then run the REFERENCE disk again.
For the 55SX the battery is contained in a large IC (manufactured by DALLAS) that is inserted into
the motherboard. Sometimes, since the CMOS is intergrated with the battery in this model, it is necessary
to clear the CMOS before the REFERENCE program can properly configure the system. To erase all
the values from the CMOS use the DOS DEBUG routine. From the DEBUG prompt type in the
following series of commands:
This will clear the CMOS. Turn off the machine and now boot from the REFERENCE disk.
The REFERENCE disk is available from IBM as rf5565a.exe.
For further information on PS2 REFERENCE files see The PS2 16X SERIES ERROR CODES.
If after clearing the CMOS your 55SX will still not boot, the see NO ROM BASIC in the REFERENCE section of COMPUTERCRAFT for a more general discussion.