Compaq 164SX User Manual
Features
2–3
Table 2–2 AlphaPC 164SX Switch/Connector/Component List
Item No. Description
Item No.
Description
XB1
RTC battery (CR2032)
J20
LEDs/speaker/buttons connectors
J1
Soft power connector
J21
SROM test port connector
J2
Input power (+3 V, +5 V, -5 V, +12 V,
-12 V)
-12 V)
J22
ISA slot 1
J3
COM1/COM2 (DB9) connectors
J23
ISA slot 0
J4
Keyboard/mouse connectors
SW1
Configuration switchpack
J5
EIDE drive 2/3 connector
U48
System clock PLL (CY2081)
J6
EIDE drive 0/1 connector
U10, U11,
U20, U22
U20, U22
L2 cache data SRAMs
J7
SDRAM DIMM 0 [0:63] connector
U21
L2 cache tag SRAM
J8
SDRAM DIMM 1 [64:128] connector
U33
21174 core logic chip
J9
SDRAM DIMM 2 [0:63] connector
U19, U26,
U29
U29
Memory address/control buffers
J10
SDRAM DIMM 3 [64:128] connector
U1, U3, U4,
U5, U7,
U12, U13,
U17, U18,
U23, U24,
U25, U27
U5, U7,
U12, U13,
U17, U18,
U23, U24,
U25, U27
Data switches
J11
Diskette (floppy) drive connector
U40 to U43
Interrupt shift registers
J13
Parallel I/O connector
U30
Flash ROM (1MB)
J14
Microprocessor fan/fan sense connector U46
PCI-ISA Bridge (CY82C693U-NC)
J15
PCI slot 3 (32-bit)
U36 to U38
IDE buffers
J16
Fan power, enclosure (+12 V)
U47
Combination controller
(FDC37C669)
(FDC37C669)
J17
PCI slot 2 (32-bit)
U2, U28,
U32
U32
Reg-reg cache isolate logic
J18
PCI slot 1 (64-bit)
U31
Microprocessor, socketed
(Alpha 21164PC)
(Alpha 21164PC)
J19
PCI slot 0 (64-bit)
U45
Microprocessor clock synthesizer
(MC12439)
(MC12439)