P5HX-B System Board Connectors
Note: some device connectors are manufacture options and may not be present on all systems

Connector	Function	Description
J1	PS/2 Keyboard Connector
J2	AT Keyboard Connector
J3	PS/2 Mouse Connector
J4	Serial 1 (COM1/COM3)
J5	Serial 2 (COM2/COM4)
J6	Printer Port
J9	FDD Connector	Attach to floppy disk drive(s)
J10	Primary IDE Connector	Attach to Primary Master, Slave
J11	Secondary IDE Connector	Attach to Secondary Master, Slave
J12	Front Panel Switches and LED indicators	Pin connections: 2-3 Turbo LED positive, negative 4-5 SMI (Suspend Mode Input) switch 6-7 Turbo mode switch 9-10 Reset switch 11-15 Keyboard lock 17-20 Speaker
J13	HDD LED (Hard Disk Drive)	Pins 1,4 positive; pins 2,3 negative
J16	Cache Module Connector
J17	USB Header	Attach to 2 channels connector of USB bracket
J19	IR Header (IBM; manufacture option)
J20	IR Header (Intel)
J21	PS/2 Mouse Header	Attach to external PS/2 mouse
J22	CPU Fan Connector	(normal mode; manufacture option)
J23	CPU Fan Connector (Green Function)	P5HX-B provides the ability to turn the CPU cooling fan off while the system is in low-power suspend mode. Connect the CPU cooling fan to J23 and enable the "CPU Fan Power Green" function in the BIOS "Power Management Setup" to activate this feature. Pins 1,3 Ground; pin 2 positive 12vDC.
J24	Green Function Indicator	Connect the LED to J24. The LED will blink when the system is in low-power suspend mode. Pin 1 ground; pin 2 positive

P5HX-B Jumpers
Host Clock, CPU type and Speed settings

Core CPU Frequency (MHz)	Host Clock	JP4	Clock Multiplier	JP2*	JP3
75	50	short 1-2, 3-4	1.5	short 1-2	short 1-2
90	60	3-4	1.5	1-2	1-2
100	66	1-2	1.5	1-2	1-2
110	55	open	2	1-2	2-3
120	60	3-4	2	1-2	2-3
133	66	1-2	2	1-2	2-3
150	60	3-4	2.5	1-2	2-3
166	66	1-2	2.5	2-3	2-3
200	66	1-2	3	2-3	1-2
233**	66	1-2	3.5	open	1-2
* The Cyrix 6x86 CPU does not have multiplier 1.5 or 2.5 Leave JP2 open when installing Cyrix 6x86. ** The HX-B system board must have (flash) BIOS v 1.6d to support 233 correctly. JP11, 12, 13, 14 are all shorted 2-3. The flash update file is available on the BSB and FTP site as P5HXB16D.ZIP See readme.txt for instructions and cautions.

Cyrix 6x86 CPU core frequency settings

Cyrix 6x86	Core CPU Frequency (MHz)	Cyrix 6x86 CPUs and AMD K5 CPUs use the P-rating as the CPU frequency. Refer to this table to get the Cyrix 6x86 CPU core frequency. For AMD K5 CPUs, check your CPU vendor for detailed information.
P120+	100
P133+	110
P150+	120
P166+	133

CPU Voltage settings

Single Voltage CPUs	JP11, JP12, JP13, JP14	CPU Voltage	JP10
	short 1-2, 1-2, 1-2, 1-2	3.3v (STD) [default]	short 1-2
		3.52v (VRE)	short 3-4
Dual Voltage CPUs	JP11, JP12, JP13, JP14	CPU I/O Voltage	JP10	CPU Core Voltage	JP17 *
	short 2-3, 2-3, 2-3, 2-3	3.3v (STD)	short 1-2	2.51v	short 1-2
				2.73v	short 3-4
				2.91v	short 5-6
		3.52v (VRE)	short 3-4	2.51v	short 1-2
				2.73v	short 3-4
				2.91v	short 5-6
* Caution! Check your processor documentation for correct voltage settings to avoid damaging the CPU. Single voltage CPUs include Intel Pentium, Intel Overdrive series, Cyrix 6x86, and AMD K5. Dual voltage CPUs include Intel Pentium with MMX technology (P55C), Cyrix 6x86L, M2 dual voltage, and AMD K5 Dual voltage CPU.

Cache Memory Size settings

Total Cache installed	JP15	JP16
0KB	open	open
256KB (256K on-board cache)	short	short 1-2
256KB (256K cache module only)	open	short 1-2
512KB (256K on-board 32Kx32 Burst SRAM and 256KB cache module installed)	short	short 3-4
512KB (256K on-board 64Kx32 Burst SRAM only)	short	short 3-4

Clear CMOS RAM

Operation	JP5
Normal (default)	short 2-3
Clear CMOS data	short 1-2
Hardware setting information and password data is stored in CMOS RAM. To clear CMOS settings, short JP5 pins 1-2, power on the system, power off the system, return JP5 jumper to 2-3 position.

P5HX-B Memory Installations
The following table shows several possible memory combinations. The P5HX-B system board supports from 8-256MB. It supports up to 4 pieces of 72-pin SIMMs; supports EDO or Fast Page Mode DRAM, supports parity or ECC function with parity SIMMs installed.

* 64MB SIMMs not tested at time of documentation.