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A
X
4
G
P
r
o
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4
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P
r
o
G
l
o
s
s
a
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y
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a
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A
A
C
C
9
9
7
7
Basically, AC97 specification separates sound/modem circuit to two parts, digital processor and a
are linked by AC97 link bus. Since digital processor can be put
onboard solution can be reduced.
A
C
P
I
(
A
d
v
a
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c
e
d
C
A
C
P
I
(
A
d
v
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d
C
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
t
o operating system (such as Windows 98). This is a bit similar as the
p
ower switch to control the power state transition.
A
A
G
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P
P
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(
A
A
c
c
c
c
e
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r
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d
d
AGP is a bus interface targeted for high-performance 3D graphic. AGP supports only memory read/write operation and
s
ingle-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
f
irst company to support 4X AGP motherboards by both AX6C (Intel 820) and MX64/AX64 (VIA 694x), started from Oct 1999.
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w
BIOS
. The chipset or super I/O chip needs to provide standard register interface
G
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a
p
p
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)
)
into motherboard main chipset, the cost of sound/modem
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PnP
register interface. ACPI defines ATX momentary soft
103
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M
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M
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CODEC
for analogy I/O they
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