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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.
It is referred to as non-volatile memory or NVRAM because, after the system loses power, it does retain state by virtue of the CMOS battery. When the battery fails, BIOS settings are reset to their defaults. The battery can also be used to power a real time clock (RTC) and the RTC, NVRAM and battery may be integrated into a single component.
The computer can be returned to its former state quickly (in response to activity such as the user pressing a key on the keyboard). APM Suspend: Most devices are powered off, but the system state is saved. The computer can be returned to its former state, but takes a relatively long time. (Hibernation is a special form of the APM Suspend state).
Commonly used on computer motherboards as nonvolatile BIOS memory and real-time clock (RTC) backup batteries, device remote controls, remote key fobs for cars and other vehicles. Also in other devices such as key finders like Apple's AirTag .
Secondary power socket and on-board charging circuit to accept a 6-volt "sealed" lead acid backup battery. Battery-backed real time clock for time and date stamping of files, if the internal RAM card is present. Includes drivers to allow GEOS to use its memory as either a replacement for swap space, or as a regular 'disk' drive.
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Although the Amstrad PC1512 and PC1640 had to compete against faster AT-type architectures at the time of their release, they were sufficiently powerful to run office software popular in the late 1980s and early 1990s, including WordPerfect 5.1, WordStar, Microsoft Word 4 and 5 for DOS, the spreadsheet Lotus 1-2-3, Matlab, and the database ...
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