.TH RTC 3.SH NAMErtc \- real-time clock and non-volatile memory.SH SYNOPSIS.B bind -b '#r' /dev.PP.B /dev/rtc.br.B /dev/rtcid.br.B /dev/nvram.SH DESCRIPTIONThe.I rtcdevice provides access to the real-time clock and any associated non-volatile memory.Physical devices supported include the Mostek MK48T12-15 Zeropower/Timekeeper,the Dallas Semiconductor DS1687 real-time clock,and the IBM PC real-time clock on various platforms..PPThe.B rtcfile when read returns the time as a decimal number, expressed as the number of seconds since the epoch,1 January 1970 00:00 GMT.The clock is set by writing the desired number of seconds since the epoch to the file.Setting the time in this device has no effect on system time returned by.B /dev/time(see.IR cons (3)),which must be set separately if desired.For example, when.I rtcis available.I osinit(see.IR init (8))uses it to set.BR /dev/time ..PPThe.B nvramfile provides access to the non-volatile memory commonly implementedby these clock chips.There are no cross-platform standards for the range of addresses thatcan be safely used by Inferno, or for the content and format of the data..PPThe.B rtcidfile holds a decimal number giving the serial number of the device,set during manufacturing.The file exists only if a particular device provides such a number..SH SOURCE.B /os/*/devrtc.c.SH SEE ALSO.IR cons (3).SH BUGSThe.B rtcfile returns seconds but.B /dev/timereturns microseconds: it's history.