®
A7A266-E
DDR RAM/SDRAM
266MHz FSB AGP Pro/4X
Socket A
© 2001
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14 13 1211 109 8
13
24.5cm (9.64in)
PS/2
CPU_FAN
0 1
USB1
USB2
0 1
Socket 462
COM1
LED
JTPWR
COM2
30.5cm (12.0in)
PWR_FAN
In
Mi
0 1
MIC2
AUX
AUDIO_PANEL
0 1
2 3
4 5
2 3
CD1
JP10
CLRTC
BCS1
BCS2
A7A266-E
MODEM
JEN
WOL_CON
IR
CHA
USB2
USB1
SMB
IDELED
CHA_FAN
14
DIP Switches
WOR
AFPANEL
PANEL
DSW
VID
15
0 1
0 1
LED
A7A266-E
A7A266-E Onboard LED
16
ON
Standby
Power
OFF
Powered
Off
0 1
1 2 3 4 5 6 7 8 9 10
0 1
ON
DSW
A7A266-E
1-10: Frequency Multiples
OFF ON
A7A266-E DIP Switch
™
™
1 2
JEN
2 3
0 1
0 1
Jumper Mode
Jumper Free (Default)
DSW
A7A266-E Jumper Mode Setting
1 2 3 4 5 6 7 8 9 10
ON
A7A266-E
OFF (Default)
17
0 1
0 1
Enable
(Default)
VID
Disable
A7A266-E
2 3
1 2
A7A266-E VID Selection
0 1
0 1
JP10
A7A266-E
1 2
2.5V
(Default)
A7A266-E DDR Voltage Setting
18
2 3
2.6V
133MHz
133MHz
1 2 3 4 5 6 7 8 9 10
ON
90MHz
90MHz
1 2 3 4 5 6 7 8 9 10
CPU→
SDRAM→
ON
0 1
0 1
A7A266-E CPU External
Frequency Selection
1 2 3 4 5 6 7 8 9 10
ON
A7A266-E
1 2 3 4 5 6 7 8 9 10
CPU→ 100MHz 100MHz 120MHz
SDRAM→ 100MHz 133MHz 120MHz
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
DSW
101MHz 126MHz
101MHz 126MHz
19
ON
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
>=12.5x
12.0x
11.5x
11.0x
10.5x
10.0x
9.5x
9.0x
8.5x
8.0x
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
ON
A7A266-E CPU External
Clock (BUS) Frequency
Selection
1 2 3 4 5 6 7 8 9 10
A7A266-E
7.5x
7.0x
6.5x
6.0x
5.5x
5.0x
ON
A7A266-E
ON
Enable
settings
OFF
Disable
settings
(Default)
A7A266-E CPU Ratio Default
ON
DSW
ON
0 1
0 1
20
DSW
0 1
0 1
6
[OFF]
[ON]
[OFF]
[ON]
[OFF]
[ON]
[OFF]
[ON]
[OFF]
[ON]
[OFF]
[ON]
[OFF]
[ON]
[OFF]
[ON]
12.5x
12.0x
11.5x
11.0x
10.5x
10.0x
9.5x
9.0x
8.5x
8.0x
7.5x
7.0x
6.5x
6.0x
5.5x
5.0x
7
[OFF]
[OFF]
[ON]
[ON]
[OFF]
[OFF]
[ON]
[ON]
[OFF]
[OFF]
[ON]
[ON]
[OFF]
[OFF]
[ON]
[ON]
8
9
[ON]
[ON]
[ON]
[ON]
[OFF]
[OFF]
[OFF]
[OFF]
[ON]
[ON]
[ON]
[ON]
[OFF]
[OFF]
[OFF]
[OFF]
[ON]
[ON]
[ON]
[ON]
[OFF]
[OFF]
[OFF]
[OFF]
[OFF]
[OFF]
[OFF]
[OFF]
[ON]
[ON]
[ON]
[ON]
0 1
0 1
2 3
1 2
A7A266-E
BCS1
(BASS/CENTER)
(Default)
BCS2
(CENTER/BASS)
A7A266-E Jumper Mode Setting
21
0 1
0 1
104 Pins
A7A266-E
A7A266-E 184-Pin DDR DIMM Sockets
22
80 Pins
0 1
0 1
88 Pins
60 Pins
A7A266-E
20 Pins
A7A266-E 168-Pin SDR DIMM Sockets
Lock
168-Pin DIMM Notch Key Definitions (3.3V)
DRAM Key Position
Unbuffered
RFU
Buffered
Voltage Key Position
Reserved
5.0V
3.3V
23
•
•
•
24
0 1
0 1
0 1
CPU NOTCH
TO INNER
CORNER
LOCK
LEVER
A7V266-E
AMD™ CPU
CPU NOTCH
A7V266-E Socket A
25
26
27
AGP Card without Retention Notch
0 1
0 1
A7A266-E
TOP VIEW
20-pin bay
Rib (inside slot)
28-pin bay
Rib
A7A266-E Accelerated Graphics Port (AGP PRO)
0 1
0 1
A7A266-E
A7A266-E Audio Modem Riser (AMR) Slot
28
ASUS MR-I Card
PS/2 Mouse (6-pin Female)
PS/2 Keyboard (6-pin Female)
29
USB 0
Universal Serial Bus (USB) 1
COM1
COM2
Serial Ports (9-pin Male)
Parallel Port (25-pin Female)
30
Game/MIDI (15-pin Female)
Line Out Line In Mic
1/8" Stereo Audio Connectors
0 1
0 1
NOTE: Orient the red markings on
the floppy ribbon cable to PIN 1
A7A266-E
PIN 1
A7A266-E Floppy Disk Drive Connector
31
Primary
Slave
Secondary
UltraDMA/
133/100/66
Master
UltraDMA/133/100/66
UltraDMA/133/100/66
UltraDMA/133/100/66
UltraDMA/133/100/66
0 1
PIN 1
A7A266-E IDE Connectors
32
Primary IDE Connector
Secondary IDE Connector
0 1
A7A266-E
- +
NOTE: Orient the red markings
(usually zigzag) on the IDE
ribbon cable to PIN 1.
0 1
0 1
A7A266-E
IDELED
0 1
0 1
A7A266-E
+5Volt
(Power Supply Stand By)
Chassis Signal
Ground
A7A266-E IDE Activity LED
TIP: If the case-mounted LED does not
light, try reversing the 2-pin plug.
1
CHASSIS
A7A266-E Chassis Open Alarm Lead
33
0 1
0 1
IMPORTANT: Requires an ATX power
supply with at least 720mA +5 volt
standby power.
WOL_CON
A7A266-E
Ground
PME +5 Volt Standby
A7A266-E Wake-On-LAN Connector
0 1
0 1
WOR
A7A266-E
1
RI#
A7A266-E Wake-On-Ring Connector
34
2
Ground
GND
+12V
Rotation
CPU_FAN
0 1
0 1
PWR_FAN
A7A266-E
CHA_FAN
GND
+12V
Rotation
GND
+12V
Rotation
A7A266-E 12-Volt Cooling Fan Power
35
0 1
USB Power
USBP2–
USBP2+
GND
NC
0 1
USB1
USB2
1
5
6
10
USB Power
USBP3–
USBP3+
GND
A7A266-E
A7A266-E Front Panel USB Headers
0 1
0 1
SMB
A7A266-E SMBus Connector
36
Ground
SMBDATA
+5V
SMBCLK
1
A7A266-E
NC
IRRX
GND
IRTX
SMBDATA
+3VSB
SMBCLK
LOCKKEY
NC
NC
GND
NC
CIRRX
+5VSB
CHASSIS#
EXTSMI#
+5V
MLEDPCIRST#
BATT
NC
+5 V
AFPANEL
IRRX
GND
IRTX
0 1
+5 V
0 1
SIR
CIR
NC
GND
NC
CIRRX
+5VSB
Standard Infrared (SIR)
Front View
Back View
A7A266-E
IR_CON
+5V
(NC)
IRTX
GND
A7A266-E Front Panel Connectors
IRRX
0 1
0 1
AAPANEL
A7A266-E
MIC2
AGND
Line in_L
AGND2
Line in_R
MICPWR
Line out_L
AGND3
Line out_R
A7A266-E Audio Panel Connector
37
CD1 (White)
(Black)
0 1
0 1
Left Audio Channel
AUX (White)
(Black)
Ground
Right Audio Channel
Ground
Left Audio Channel
Right Audio Channel
A7A266-E
Modem-Out
Ground
Ground
Modem-In
MODEM
A7A266-E Internal Audio Connectors
0 1
0 1
MIC2
A7A266-E
A7A266-E Internal Microphone Connector
38
3
MIC Power
MIC Input
Ground
1
0 1
0 1
A7A266-E
+12.0Volts
+5V Standby
Power Good
Ground
+5.0 Volts
Ground
+5.0 Volts
Ground
+3.3 Volts
+3.3 Volts
+5.0 Volts
+5.0 Volts
-5.0 Volts
Ground
Ground
Ground
Power Supply On
Ground
-12.0Volts
+3.3Volts
A7A266-E ATX Power Connector
0 1
0 1
JTPWR
Power Supply
Thermal Sensor
A7A266-E
A7A266-E Thermal Sensor Connector
39
* Requires an ATX power supply.
Speaker
Connector
0 1
0 1
IDELock
LED
Keyboard
SMI Lead
A7A266-E System Panel Connectors
40
+5V
Ground
Ground
SPKR
PLED
IDELED+
IDELED-
Message LED
ResetCon
Ground
A7A266-E
+5 V
MLED
ExtSMI#
Ground
PWR_SW
Ground
+5 V
Power LED
Reset SW
ATX Power Switch*
41
42
43
44
45
46
47
MAIN
ADVANCED
POWER
BOOT
EXIT
<F1> or <Alt + H>
<Esc> or<Alt + X>
← or → (keypad arrow)
↑ or ↓ (keypad arrows)
- (minus key)
+ (plus key) or spacebar
<Enter>
<Home> or <PgUp>
<End> or <PgDn>
<F5>
<F10>
48
49
50
51
52
53
54
0 1
0 1
CR2032 3V
Lithium Cell
CMOS Power
A7A266-E
CLRTC
Short solder points
to Clear CMOS
A7A266-E Clear RTC RAM
55
™
56
CPU
[manual]
CPU
[Auto]
CPU
CPU
57
58
59
60
61
62
63
64
65
66
67
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86
Line Out Line In Mic
87
88
®
89
®
90