.TH ISASET 8 "April 2011"
.SH "NAME"
isaset \- set ISA registers

.SH SYNOPSIS
.B isaset
.RB [ -y ]
.RB [ -W | -L ]
.I addrreg
.I datareg
.I address
.I value
.RI [ mask ]
#for I2C-like access
.br
.B isaset
.B -f
.RB [ -y ]
.RB [ -W | -L ]
.I address
.I value
.RI [ mask ]
#for flat address space

.SH DESCRIPTION
isaset is a small helper program to set registers visible through the ISA
bus.

.SH OPTIONS
.TP
.B -f
Enable flat address space mode.
.TP
.B -y
Disable interactive mode. By default, isaset will wait for a confirmation
from the user before messing with the ISA bus. When this flag is used, it
will perform the operation directly. This is mainly meant to be used in
scripts.
.TP
.B -W
Perform a 16-bit write.
.TP
.B -L
Perform a 32-bit write.

.SH OPTIONS (I2C-like access mode)
Four options must be provided to isaset. \fIaddrreg\fR contains the
ISA address of the address register for the chip to probe; \fIdatareg\fR
contains the address of the data register. Both addresses are integers between
0x0000 and 0x3FFF. Usually, if the chip's base address is 0x0nn0, the
address register is at 0x0nn5 and the data register is at 0x0nn6. The most
common base address for hardware monitoring chips is 0x0290.
For Super-I/O chips, address register is typically at 0x2E with data
register at 0x2F.
The \fIaddress\fR and \fIvalue\fR parameters are two integers between
0x00 and 0xFF. isaset will write value \fIvalue\fR to address \fIaddress\fR.
An optional \fImask\fR can be provided as a fifth parameter, preserving
unmasked bits at the written location.

.SH OPTIONS (flat address space mode)
In flat mode, two parameters must
be provided. \fIaddress\fR contains the ISA address of the register to
write to; it is an integer between 0x0000 and 0xFFFF. Basically, it is
the sum of the chip's base address and the chip register's address. isaset
will write value \fIvalue\fR at this address.
An optional \fImask\fR can be provided as a third parameter, preserving
unmasked bits at the written location.

.SH WARNING
Poking around in ISA data space is extremely dangerous.
Running isaset with random parameters can cause system
crashes, data loss, and worse!  Be extremely careful when using
this program.

.SH SEE ALSO
i2cset(8), isadump(8)

.SH AUTHOR
Mark D. Studebaker, and the lm_sensors group
(https://hwmon.wiki.kernel.org/lm_sensors)
.PP
This manual page was shamelessly ripped from the i2cset and isadump manual
pages by Jean Delvare.