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RTC

15 bytes added, 2 April
/* RTC Registers */
7 VRT Valid RAM and Time (1=Okay, 0=Battery Low) (R)
6-0 0 Reserved (zero)
0Eh..3Fh battery backed RAM (HD146818, DS1287A, DS12887A and other chips) 40h..7Fh battery backed RAM (only on DS12887A, and newer chip variants only)
80h..FFh reserved
Phi2x
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