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Basically, AC97 specification separates sound/modem circuit to two parts, digital processor and a
linked by AC97 link bus. Since digital processor can be put into motherboard main chipset, the cost of sound/modem onboard
solution can be reduced.
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ACPI is the power management specification of PC97 (1997). It intends to save more power by taking full control of power
management to operating system and bypass BIOS. The chipset or super I/O chip needs to provide standard register interface to
operating system (such as Windows 98). This is a bit similar as the
switch to control the power state transition.
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AGP is a bus interface targeted for high-performance 3D graphic. AGP supports only memory read/write operation and
single-master single-slave one-to-one only. AGP uses both rising and falling edge of the 66MHz clock, for 2X AGP, the data transfer
rate is 66MHz x 4byte x 2 = 528MB/s. AGP is now moving to 4X mode, 66MHz x 4byte x 4 = 1056MB/s. AOpen is the first company
to support 4X AGP motherboards by both AX6C (Intel 820) and MX64/AX64 (VIA 694x), started from Oct 1999.
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register interface. ACPI defines ATX momentary soft power
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for analogy I/O they are
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