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 (see auth(8)) from there.

SEE ALSO

auth(8), boot(8)

Plan 9  —  January 03, 1993