User`s manual

Features of the AlphaPC 164LX Motherboard 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
(DSC 21174-CA)
J11 SDRAM DIMM 3 [64:128] connector U40 Microprocessor, socket (DSC 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 U47 Microprocessor clock synthesizer
(MC12439)
J16 PCI slot 3 (32-bit) U48 Serial ROM, socketed (Xilinx
XC17128D)
J17 PCI slot 2 (32-bit) U49 PCI-to-ISA bridge (Intel 82378ZB)
J18 Microprocessor fan/fan sense connec-
tor
U52 Combination controller, Super I/O
(SMC FDC37C935)
J19 Enclosure fan +12V power connector U57 Flash ROM (1MB)
J20 Speaker connector U58 PCI arbiter PAL
J21 Reset button connector U59 PCI interrupt request PAL
J22 Halt button connector U60 Power controller
J23 PCI slot 1 (64-bit) U61 Power sense
J24 Power LED connector