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CR2032 battery used as backup battery on a notebook motherboard. Modern personal computer motherboards have a backup battery to run the real-time clock circuit and retain configuration memory while the system is turned off. [1] This is often called the CMOS battery or BIOS battery.
The main 50/60 Hz transformer used to convert between line voltage and battery voltage needs to provide two slightly different turns ratios: One to convert the battery output voltage (typically a multiple of 12 V) to line voltage, and a second one to convert the line voltage to a slightly higher battery charging voltage (such as a multiple of ...
The Portable 286 featured a full height hard disk, and the options of one half-height floppy drive, two half-height floppy drives, or a half-height floppy drive and a tape backup drive The Compaq Portable 286, Compaq's version of the PC AT was offered in the original Compaq Portable chassis; equipped with 6/8 MHz 286 and a high-speed 20 MB hard ...
First-generation microcomputer and home computer power supply units used a heavy step-down transformer and a linear power supply, as used, in for example, the Commodore PET introduced in 1977. The Apple II , also introduced in 1977, was noted for its switched-mode power supply , which was lighter and smaller than an equivalent linear power ...
The backup data needs to be stored, requiring a backup rotation scheme, [4] which is a system of backing up data to computer media that limits the number of backups of different dates retained separately, by appropriate re-use of the data storage media by overwriting of backups no longer needed. The scheme determines how and when each piece of ...
Backup software are computer programs used to perform a backup; they create supplementary exact copies of files, databases or entire computers. These programs may later use the supplementary copies to restore the original contents in the event of data loss ; [ 1 ] hence, they are very useful to users.