CMOS (ver 1.00) Abandoned Freeware CMOS is a command line utility which can save and restore regular and Extended CMOS memory to a file, as backup in case of battery failure. CMOS can be run in a batch file (such as your scheduled backup/maintenance batch file). NOTE: CMOS will not work on XTs (no CMOS), or on computers with an EISA or MCA architecture (exotic CMOS).