Presario 51XX (AMD) System Board Connectors

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Jumpers

JP1 (CPU clock multiplier)
CPU clock speed 100 MHz bus 200 250 300 350 400 450 500 550
95 MHz bus 190 238 285 333 380 428 475 523
pins 1-2 on on off off on on off off
pins 3-4 off on on off off on on off
pins 5-6 off off off off on on on on

JCK3 (CPU bus speed select)
CPU bus speed (MHz) 95 100
Pins 1-2 on off

 

JCK1 (SDRAM clock source)
CMOS state CPU clock* AGP clock
Jumper position pins 1-2 pins 2-3

JCK2 (CPU bus clock select)
CMOS state 66 MHz bus 95 or 100 MHz bus*
Jumper position pins 1-2 pins 2-3

VS1 (CPU pin U33 voltage select)
U33 voltage 3.3 V* 3.45 V
Jumper position pins 1-2 pins 2-3

JP3 (CPU core voltage select)
VCC2H/L# low 2.0 2.1 2.2* 2.3 2.4 2.5 2.6 2.7
VCC2H/L# high 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5
pins 1-2 off on off on off on off on
pins 3-4 off off on on off off on on
pins 5-6 off off off off on on on on

Connector information
Function Description Reference Designator
Keyboard Miniature 6-pin ½J1
Mouse Miniature 6-pin ½J1
Parallel port DSUB 25-pin J4
Serial port DSUB 15-pin J8
Ethernet connector RJ45 J2
Flat panel monitor connector 20-pin DFPP J3
Video 15-pin VGA J5
Microphone in Mini stereo ½J7
Speaker out Mini stereo ½J6
Line out Mini stereo ½J7
Line in Mini stereo ½J6
DIMM sockets 168-pin DIMM DIMM 1 - 3
SODIMM socket 144-pin SODIMM J16
Socket 7 321-pin PGA U25
Socket 7 clock multiplier 6-pin header JP1
SDRAM clock source 3-pin header JCK1
CPU bus clock select 3-pin header JCK2
CPU bus speed select 2-pin header JCK3
Battery socket Battery holder BAT1
Power supply 6- and 12-pin ATPWR headers J15, J12
PCI slots 32-bit PCI connector J13, J14
ISA slots 16-bit ISA connector J9, J10
CD-ROM audio 4-pin header, key 2 J11
IDE drive (Primary) 40-pin headers, key 20 J18
IDE drive (Secondary) 40-pin headers, key 20 J19
Diskette drive 34-pin header J24
Headphone board 5-pin 2mm connector J22
Internal speakers 2-pin header J20, J21
Game DSUB 15-pin J23
CPU core voltage select 6-pin header JP3
Second fan 4-pin header, key 2 J17
CPU pin U33 voltage select 3-pin header VS1
CMOS clear 3-pin header JP2
Button board 5-pin header J2