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PRTC(4) Device Drivers Manual (sparc64) PRTC(4)

prtcPROM real-time clock

prtc0 at mainbus0

The prtc driver provides support for the time of day service provided by the PROM on systems that do not have a hardware real-time clock like the Sun Enterprise 10000, Sun Fire 12K and Sun Fire 15K.


The prtc driver first appeared in OpenBSD 4.4.

The prtc driver was written by Mark Kettenis <>.

July 16, 2013 OpenBSD-current