Features 2–3
Table 2–2 AlphaPC 164LX Jumper/Connector/Component List
Item No. Description Item No. Description
B1 RTC battery (CR2032) J25 Hard-drive LED connector
J1 Soft power connector J26 PCI slot 0 (64-bit)
J2 Fan power, enclosure (+12V) J27 System configuration jumpers
J3 Power (+3V, +5V, -5V, +12V, -12V) J28 Flash ROM update enable/disable
jumper
J4 COM1/COM2 (DB9) connectors J29 SROM test port connector
J5 Keyboard/mouse connectors J30 ISA slot 1
J6 EIDE drive 2/3 connector J31 ISA slot 0
J7 EIDE drive 0/1 connector U8 to U10 Cache SRAM (L3)
J8 SDRAM DIMM 0 [0:63] connector U20 to U22 Cache SRAM (L3)
J9 SDRAM DIMM 1 [64:128] connector U31 to U33 Cache SRAM (L3)
J10 SDRAM DIMM 2 [0:63] connector U37 I/O interface and address control
(DS 21174-CA)
J11 SDRAM DIMM 3 [64:128] connector U40 Microprocessor, socket
(DS Alpha 21164)
J12 Reserved U41 Patch 8K PAL
J13 Parallel I/O connector U42 EIDE controller
J14 Reserved U43 System clock PLL (CY2308)
J15 Diskette (floppy) drive connector U48 Microprocessor clock synthesizer
(MC12439)
J16 PCI slot 3 (32-bit) U49 Serial ROM, socketed (Xilinx
XC17128D)
J17 PCI slot 2 (32-bit) U50 PCI-to-ISA bridge (Intel 82378ZB)
J18 Microprocessor fan/fan sense connec-
tor
U53 Combination controller, Super I/O
(SMC FDC37C935)
J19 Enclosure fan +12V power connector U58 Flash ROM (1MB)
J20 Speaker connector U59 PCI arbiter PAL
J21 Reset button connector U60 PCI interrupt request PAL
J22 Halt button connector U61 Power controller
J23 PCI slot 1 (64-bit) U62 Power sense
J24 Power LED connector
