CMOS: Difference between revisions
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→See Also: Add first-hand references that describe RTC |
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"CMOS" is a tiny bit of very low power static memory that lives on the same chip as the Real-Time Clock. RTC was introduced into IBM PC AT as Motorola It
is fairly convenient to actually think of the RTC as being "part" of CMOS.
CMOS (and the Real-Time Clock) can only be accessed through IO Ports 0x70 and 0x71. The function of the CMOS
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* [https://web.archive.org/web/20111209041013/http://www-ivs.cs.uni-magdeburg.de/~zbrog/asm/cmos.html Old CMOS Map]
* [http://www.bioscentral.com/misc/cmosmap.htm Better CMOS Map]
* [http://bitsavers.trailing-edge.com/pdf/ibm/pc/at/1502494_PC_AT_Technical_Reference_Mar84.pdf IBM PC AT Technical Reference]
* [http://web.stanford.edu/class/cs140/projects/pintos/specs/mc146818a.pdf MC146818A REAL-TIME CLOCK PLUS RAM (RTC)]
* [http://www.bitsavers.org/pdf/ibm/pc/ps2/PS2_Model_50_Technical_Reference_May88.pdf IBM PS/2 Technical Reference]
[[Category:X86]]
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