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Unit 7 Research Paper 1: CMOS
CMOS is known as Complementary Metal Oxide Semiconductor. It is a technology used for constructing integrated circuits. The technology is used in microprocessors, microcontrollers, static RAM, and other digital circuits. Frank Wanlass patented CMOS in 1963. CMOS’s typical design is for logic functions using various MOSFETs also known as Metal Oxide Semiconductor Field Effect Transistors.

The early types of CMOS, which is used to store BIOS memory, used the on-board battery to maintain the power to the CMOS at all times. This prevented your memory settings that were stored on board from being erased after turning your computer off or after loss of power. In modern CMOS systems, the CMOS does not use the on-board battery to maintain and save BIOS settings; instead the battery is only used to provide power to the system clock on board the PC.

Memory on-board the CMOS has relatively remained unchanged since it was first patented. Memory for CMOS ranges from 128 bytes to the largest, as of yet, of 512 bytes. The reason for not needing the change in size is that CMOS was and is only designed to hold the absolute basic boot settings needed for any given system.

CMOS does indeed still utilize RAM for startup functions on a PC as of today, which has not changed since it was developed. Again, as mentioned above, the CMOS does not utilize the battery located on the motherboard any longer. CMOS has evolved into using EEPROM or Electrically Erasable Programmable Read-Only Memory. This technology allows the circuits on a CMOS to be read, erased, and re-written, which allows for faster information retrieval.
Works Cited
Bochs. (n.d.). Retrieved May 22nd, 2014, from http://bochs.sourceforge.net/techspec/CMOS-reference.txt
Cha Cha. (n.d.). Retrieved May 22nd, 2014, from http://www.chacha.com/question/has-the-size-of-cmos-memory-changed-over-the-years
PC Support. (n.d.). Retrieved May 22nd, 2014, from http://pcsupport.about.com/od/termsc/g/cmos.htm
Wikipedia. (n.d.). Retrieved May 22nd, 2014, from http://en.wikipedia.org/wiki/CMOS
Wikipedia. (n.d.). Retrieved May 22nd, 2014, from http://en.wikipedia.org/wiki/EEPROM

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