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BatteryMAX (idle detection)
BatteryMAX is an Idle Detection System used for computer power management developed at Digital Research, Inc.'s European Development Centre (EDC) in Hungerford, UK. It was invented by British borne engineers Roger Gross and John Constant in August 1989 and was first released with DR DOS 5.0. It was created to address the new genre of portable personal computers (lap-tops) which ran from battery power. As such, it was also an integral part of Novell's PalmDOS 1.0 operating system tailored for early palmtops in 1992.
== Description ==
Power saving in laptop computers traditionally relied on hardware inactivity timers to determine whether a computer was idle. It would typically take several minutes before the computer could identify idle behavior and switch to a lower power consumption state. By monitoring software applications from within the operating system, BatteryMAX is able to reduce the time taken to detect idle behavior from minutes to microseconds. Moreover it can switch power states around 20 times a second between a user's keystrokes. The technique was named Dynamic Idle Detection and includes halting, or stopping the CPU for periods of just a few microseconds until a hardware event occurs to restart it.
DR DOS 5.0 was the first Personal Computer operating system to incorporate an Idle Detection System for power management. An US patent describing the Idle Detection System ((5,355,501 )) was filed on 9 March 1990 and was granted in 11 October 1994.
Despite taking an early lead and having the protection of a patent, BatteryMAX did not enjoy commercial success having been sidelined after the disarray that followed the integration of Digital Research into Novell, Inc. in 1991. It was not until 1992, some three years after the invention that software power management under operating system control became ubiquitous following the launch of Advanced Power Management by Microsoft and Intel.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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