| DPCLOCK(4) | Device Drivers Manual (sgimips) | DPCLOCK(4) | 
dpclock —
dpclock* at hpc0 offset ?
dpclock driver provides support for the DP8573A
  real-time clock (RTC). This device appears on SGI Personal Iris 4D/2x, 4D/3x
  and Indigo machines. Note that the kernel expects the RTC to run in UTC.
dpclock driver first appeared in
  NetBSD 2.0.
| February 17, 2017 | NetBSD 10.1 |