man.postnix Miscellaneous man pages of Plan 9 related material

     RTC(3)                                                     RTC(3)

     NAME
          rtc - real-time clock and non-volatile RAM

     SYNOPSIS
          bind #r /dev

          /dev/rtc
          /dev/nvram

     DESCRIPTION
          The rtc device supports the Mostek MK48T12-15
          Zeropower/Timekeeper and similar devices with real-time
          clocks and non-volatile RAM.

          The rtc file behaves just like /dev/time (see cons(3)). The
          real-time clock is maintained on-board; /dev/time is set
          from the file server.  Neither is necessarily more accurate.

          The nvram file provides (if permission allows) access to the
          local non-volatile RAM.  For example, boot(8) reads the
          machine's key from there (see auth(8)).

     SEE ALSO
          auth(8), boot(8)

     SOURCE
          /sys/src/9/*/devrtc.c

     Page 1                       Plan 9            (printed 10/25/25)