man.postnix Miscellaneous man pages of Plan 9 related material

     SWITCH(3)                   (MPC8xx)                    SWITCH(3)

     NAME
          switch - hardware option switch

     SYNOPSYS
          bind -a '#r' /dev

          /dev/switch

     DESCRIPTION
          The switch device serves a one-level directory, giving
          access to one read-only file, switch.  A read returns the
          value of the development board's option switch (DS1), repre-
          sented as a decimal number from 0 to 15, representing four
          bits, each corresponding to one of the four toggles.  Each
          toggle produces the value 0 when it is set `ON' and 1 when
          it is off.  Toggle 1 corresponds to bit 1<<3 in the number,
          toggle 2 corresponds to bit 1<<2, and so on

     SOURCE
          /os/mpc/devrtc.c

     Page 1                       Plan 9            (printed 12/15/25)