Specifications

17 January 1997 – Subject to Change
System Configuration and Connectors 2–3
Table 2–1 AlphaPC 164 Jumper/Connector/Component List
Item Number Description Item Number Description
B1 RTC battery (CR2032) J1 Memory bus width jumper
J2 Fan power, enclosure (+12V) J3 Power (+3V, +5V, -5V, +12V, -12V)
J4 COM1/COM2 (DB9) connectors J5 DRAM SIMM 0 [35:0] connector
J6 DRAM SIMM 1 [71:36] connector J7 DRAM SIMM 2 [107:72] connector
J8 DRAM SIMM 3 [143:108] connector J9 DRAM SIMM 4 [179:144] connector
J10 DRAM SIMM 5 [215:180] connector J11 DRAM SIMM 6 [251:216] connector
J12 DRAM SIMM 7 [287:252] connector J13 IDE drive 2/3 connector
J14 IDE drive 0/1 connector J15 Keyboard/mouse connectors
J16 Parallel I/O connector J18 Diskette (floppy) drive connector
J19 PCI slot 3 (32-bit) J20 PCI slot 2 (32-bit)
J21 Microprocessor fan/fan sense con-
nector
J22 Enclosure fan +12V power connector
J23 Speaker connector J24 Reset button connector
J25 Halt button connector J26 PCI slot 1 (64-bit)
J27 Power LED connector J28 Hard-drive LED connector
J29 PCI slot 0 (64-bit) J30 Configuration jumpers
J31 Flash update enable/disable jumper J32 SROM test port connector
J33 ISA slot 1 J35 ISA slot 0
U2 Data switch 0 (DSC 21172-BA) U5 to U7 Cache SRAM (L3)
U10 to U12 Cache SRAM (L3) U14 Data switch 1 (DSC 21172-BA)
U15 to U17 Cache SRAM (L3) U18 Data switch 2 (DSC 21172-BA)
U21 Microprocessor, socketed
(DSC 21164 Alpha)
U22 Data switch 3 (DSC 21172-BA)
U25 I/O interface and address control
(DSC 21172-CA)
U29 IDE controller
U34 Microprocessor clock crystal, 36.66-
MHz (default), socketed
U35 Microprocessor clock PLL (TriQuint
TQ2061)
U36 System clock PLL (CDC 2586) U39 Serial ROM, socketed
(Xilinx XC17128D)
U40 PCI-to-ISA bridge
(Intel 82378ZB)
U41 Combination controller, Super I/O
(SMC FDC37C935)
U48 Flash ROM (1MB) U49 PCI arbiter PAL
U50 PCI interrupt request PAL U51 Power controller
U52 Power sense — —