IBM RT-686 User Manual page 39

The Power Management supports various operating systems (OS). Doze and
SpeedStep are OS-independent. Other options work in accordance with the OS
power management components.
Windows 2000/ME would enable ACPI mode while Windows 95 enables APM
mode.
Other OS (DOS, Windows NT, etc.) without ACPI or APM would apply generic
power management.
POS: Power On Suspend (system does not turn off)
STD: Suspend To Disk (system turns off)
SpeedStep: Intel proprietary CPU speed control for mobile models (code
name "Geyserville")
SpeedStep
Enabled
Disabled
AC adapter operation
High speed
Low speed
30
BIOS Setup
Battery operation
Low speed
Low speed