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.TH RTC 3
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.SH NAME
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rtc \- real-time clock and non-volatile RAM
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.SH SYNOPSIS
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.B bind #r /dev
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.PP
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.B /dev/rtc
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.br
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.B /dev/nvram
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.SH DESCRIPTION
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The
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.I rtc
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device supports devices
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with real-time clocks and non-volatile RAM.
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.PP
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The
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.B rtc
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file behaves just like
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.BR /dev/time
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(see
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.IR cons (3)).
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The real-time clock is maintained on-board;
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.B /dev/time
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is set from the file server.  Neither is necessarily more accurate.
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.PP
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The
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.B nvram
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file provides (if permission allows)
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access to the local non-volatile RAM.
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For example,
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.IR boot (8)
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reads the machine's key
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from there
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(see
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.IR auth (8)).
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.SH SEE ALSO
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.IR auth (8),
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.IR boot (8)
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.SH SOURCE
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.B /sys/src/9/*/devrtc.c