Acer 390 Series Service Manual page 82

Independent programmable level/edge triggered channels
Counter/Timers
8254 compatible timers for System Timer, Refresh Request, Speaker Output Use
Distributed DMA supported
7 DMA Channels can be arbitrarily programmed as distributed channel
Serialized IRQ supported
Quiet/Continuous mode
Programmable (default 21) IRQ/DATA frames
Programmable START frame pulse width
Plug-and-Play port supported
One programmable chip select
Two steerable interrupt request lines
Built-in keyboard controller
Built-in PS/2/AT keyboard and PS/2 mouse controller
Supports up to 256-KB ROM size decoding
Supports positive/subtractive decode for ISA device
PMU features
Full-support for ACPI and OS directed power management
CPU SMM Legacy mode and SMI feature supported
Supports programmable STPCLKJ: throttle/CKONSTP/CKOFFSTP control
Supports I/O trap for I/O restart feature
PMU operation states :
On
Standby
Sleeping ( Power-On Suspend )
Suspend ( Suspend to DRAM)
Suspend to HDD
Soft Off
Mechanical Off
APM state detection and control logic supported
Global and local device power control logic
Ten Programmable Timers: Standby / LB / LLB / APMA / APMB / Global_Display /
Primary_IDE / Secondary_IDE / SIO&Audio / Programmable IO Region
Provides system activity and display activity monitorings, including:
Video
Audio
2-36 Service Guide