Acer 390 Series Service Manual page 84

L2 cache power down and PCI CLKRUN control logic supported
21 general purpose input signals, 24 general purpose output signals, 20 general purpose
input/output signals
16 external expandable general purpose inputs, 16 external expandable general purpose
outputs
LCD control
All registers readable/restorable for proper resume from Suspend state
Built-in PCI IDE controller
Supports Ultra 33 Synchronous DMA Mode transfers up to Mode 2 Timing (33 MB/sec)
Supports PIO Modes up to Mode 5 timings, and Multiword DMA Mode 0, 1 ,2 with
independent timing of up to 4 drives
Integrated 10 x 32-bit read ahead & posted write buffers for each channel (total: 20
Dwords)
Dedicated pins of ATA interface for each channel
Supports tri-state IDE signals for swap bay
USB interface
One root hub with two USB ports based on OpenHCI 1.0a specification
Supports FS (12Mbits/sec) and LS (1.5Mbits/sec) serial transfer
Supports Legacy keyboard and mouse software with USB-based keyboard and mouse
SMBus interface
System Management Bus interface which meets the v1.0 specification
External APIC interface supported
328-pin (27mm x 27mm) BGA package
2-38 Service Guide