2.11BSD/sys/OTHERS/rc/rcreg.h
Compare this file to the similar file:
17: 2.9BSD/usr/src/sys/dev/Others/rcreg.h
17: 2.9BSD/usr/net/sys/dev/Others/rcreg.h
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struct rcdevice { short rcymd; short rchm; short rcsec; short rccsr; };