Red Hat LINUX 7.2 Reference Manual page 82

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A common file found here is rtc, which provides output from the driver for the system's Real Time
Clock (RTC), the device that keeps the time while the system is switched off. Sample output from
/proc/driver/rtc looks like this:
rtc_time : 18:06:33
rtc_date : 2001-05-08
rtc_epoch : 1900
alarm : 02:01:19
DST_enable : no
BCD : yes
24hr : yes
square_wave : no
alarm_IRQ : no
update_IRQ : no
periodic_IRQ : no
periodic_freq : 1024
batt_status : okay
For more information about the RTC, review /usr/src/linux-2.4/Documenta-
tion/rtc.txt.
4.3.4 /proc/fs
This directory contains specific filesystem, file handle, inode, dentry and quota information. This
information is actually located in /proc/sys/fs.
4.3.5 /proc/ide
This directory holds an assorted array of information about IDE devices on the system. Each IDE
channel is represented as a separate directory, such as /proc/ide/ide0 and /proc/ide/ide1.
In addition, a drivers file is also available, providing the version number of the various drivers used
on the IDE channels:
ide-cdrom version 4.59
ide-floppy version 0.97
ide-disk version 1.10
Many chipsets also provide an informational file in this directory that gives additional data concerning
the drives connected through the various channels. For example, a generic Intel PIIX4 Ultra 33 chipset
produces a /proc/ide/piix that will tell you whether DMA or UDMA is enabled for the devices
on the IDE channels:
--------------- Primary Channel ---------------- Secondary Channel -------------
--------------- drive0 --------- drive1 -------- drive0 ---------- drive1 ------
Intel PIIX4 Ultra 33 Chipset.
enabled
Chapter 4:The /proc Filesystem
enabled