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System Overview 1-11
Figure 1-9. Power Distribution
P3
+5 VDC
+12 VDC
–12 VDC
+12 VDC
+12 VDC
–12 VDC
3.5-inch
diskette drive
system
power supply
PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
–12 VDC
PWRGOOD
PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
–12 VDC
power
management
logic
keyboard
controller
battery
+3 VDC
P1
POWER1
+5 VDC
–5 VDC
+12 VDC
–12 VDC
+5 VDC
–5 VDC
ISA1,
ISA2
PCI1
through
PCI5
MICROPROCESSOR
+5 VDC
+5 VDC
+5 VDC
+5 VDC
PANEL
USB
KYBD
MOUSE
DIMM_A
DIMM_B
DIMM_C
DIMM_D
main memory
sockets
P4
FAN
RISER
internal
hard-disk drive
P2
optional
drive
P5
P6
+5 VFP
RTC/
NVRAM
P7
+3.3 VDC
2ND_CPU
riser board
system board
optional
drive
internal
hard-disk drive
POWER2
+3.3 VDC
processor
core regulator
+2.1–3.5 VDC
+3.3 VDC
+2.1–3.5 VDC
FUSE
FUSE