Compaq user manual AlphaPC 164SX Switch/Connector/Component List, XB1

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,	J22	ISA slot 1
	-12 V)
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,	L2 cache data SRAMs
		U20, U22
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,	Memory address/control buffers
		U29
J10	SDRAM DIMM 3 [64:128] connector	U1, U3, U4,	Data switches
		U5, U7,
		U12, U13,
		U17, U18,
		U23, U24,
		U25, U27
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,	Reg-reg cache isolate logic
		U32
J18	PCI slot 1 (64-bit)	U31	Microprocessor, socketed
			(Alpha 21164PC)
J19	PCI slot 0 (64-bit)	U45	Microprocessor clock synthesizer
			(MC12439)

Features 2–3