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System Configuration and Connectors 2–3
Table 2–1 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)
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
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
Memory address/control buffers
J10 SDRAM DIMM 3 [64:128] connector U1, U3, U4,
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)
J17 PCI slot 2 (32-bit) U2, U28,
U32
Reg-reg cache isolate logic
J18 PCI slot 1 (64-bit) U31 Microprocessor, socketed
(Alpha 21164PC)
J19 PCI slot 0 (64-bit) U45 Microprocessor clock synthesizer
(MC12439)