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Table 2–2 AlphaPC 164LX Jumper/Connector/Component List
Item No. Description
B1
RTC battery (CR2032)
J1
Soft power connector
J2
Fan power, enclosure (+12V)
J3
Power (+3V, +5V, -5V, +12V, -12V) J28
J4
COM1/COM2 (DB9) connectors
J5
Keyboard/mouse connectors
J6
EIDE drive 2/3 connector
J7
EIDE drive 0/1 connector
J8
SDRAM DIMM 0 [0:63] connector
J9
SDRAM DIMM 1 [64:128] connector U31 to U33 Cache SRAM (L3)
J10
SDRAM DIMM 2 [0:63] connector
J11
SDRAM DIMM 3 [64:128] connector U40
J12
Reserved
J13
Parallel I/O connector
J14
Reserved
J15
Diskette (floppy) drive connector
J16
PCI slot 3 (32-bit)
J17
PCI slot 2 (32-bit)
J18
Microprocessor fan/fan sense connec-
tor
J19
Enclosure fan +12V power connector U57
J20
Speaker connector
J21
Reset button connector
J22
Halt button connector
J23
PCI slot 1 (64-bit)
J24
Power LED connector
Item No.
Description
J25
Hard-drive LED connector
J26
PCI slot 0 (64-bit)
J27
System configuration jumpers
Flash ROM update enable/disable
jumper
J29
SROM test port connector
J30
ISA slot 1
J31
ISA slot 0
U8 to U10
Cache SRAM (L3)
U20 to U22 Cache SRAM (L3)
U37
I/O interface and address control
(DSC 21174-CA)
Microprocessor, socket (DSC Alpha
21164)
U41
Patch 8K PAL
U42
EIDE controller
U43
System clock PLL (CY2308)
U47
Microprocessor clock synthesizer
(MC12439)
U48
Serial ROM, socketed (Xilinx
XC17128D)
U49
PCI-to-ISA bridge (Intel 82378ZB)
U52
Combination controller, Super I/O
(SMC FDC37C935)
Flash ROM (1MB)
U58
PCI arbiter PAL
U59
PCI interrupt request PAL
U60
Power controller
U61
Power sense
Features of the AlphaPC 164LX Motherboard
2–3
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