LM(4)                     OpenBSD Programmer's Manual                    LM(4)

NAME
     lm - National Semiconductor LM78, LM79 and compatible hardware monitors

SYNOPSIS
     lm0 at isa? port 0x290
     lm1 at isa? port 0x280
     lm2 at isa? port 0x310

DESCRIPTION
     The lm driver provides support for the National Semiconductor LM series
     hardware monitors and register compatible chips to be used with the
     sysctl(8) interface.

     Most supported devices possess 11 sensors:

           Sensor    Units    Typical Use
           IN0       uV DC    Core voltage
           IN1       uV DC    Unknown
           IN2       uV DC    +3.3V
           IN3       uV DC    +5V
           IN4       uV DC    +12V
           IN5       uV DC    -12V
           IN6       uV DC    -5V
           Temp      uK       Motherboard Temperature
           Fan0      RPM      Fan
           Fan1      RPM      Chassis Fan
           Fan2      RPM      Fan

     For some devices (most Winbond devices), sensors' names and numbers will
     be different.

     Due to hardware limitations, fresh sensor data is only available every
     1.5 seconds.

HARDWARE
     Chips supported by the lm driver include:
           National Semiconductor LM78 and LM78-J
           National Semiconductor LM79
           Winbond W83697HF
           Winbond W83627HF, W83627THF, W83781D and W83782D

SEE ALSO
     sensorsd(8), sysctl(8)

HISTORY
     The lm driver first appeared in NetBSD 1.5, OpenBSD support was added in
     OpenBSD 3.4.

AUTHORS
     The lm driver was written by Bill Squier and ported to OpenBSD 3.4 by
     Alexander Yurchenko <grange@openbsd.org>.

BUGS
     Interrupt support is unimplemented.

     There are currently no known pnpbios IDs assigned to LM chips.

OpenBSD 3.5                    February 26, 2000                             1
