Presario 2275 System Board
J29 settings (processor core voltage) |
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| K6S, K6-2 | M2, K6 | |
| Pins 1-2 | off | on |
| Pins 3-4 | off | off |
| Pins 5-6 | on | off |
| Pins 7-8 | off | on |
J30 DLL setting |
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| Pin 2-3 | K6S 300 MHz only |
| Pin 1-2 | All other processors |
Bus frequency |
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| Processor bus, MHz | 75 | 66.8 |
| PCI bus, MHz | 32 | 33.4 |
| CLK 0 | 1-2 | 1-2 |
| CLK 1 | 2-3 | 1-2 |
| CLK 2 | 2-3 | 1-2 |
FREQ Settings |
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| Processor | M-II | K6-2 | ||
| Processor speed, MHz | 225 | 233 | 300 | 333 |
| Bus speed, MHz | 75 | 66 | 66 | 66 |
| Multiplier | 3.0 | 3.5 | 4.5 | 5.0 |
| FREQ 0 | 1-2 | 1-2 | 2-3 | 1-2 |
| FREQ 1 | 2-3 | 1-2 | 2-3 | 2-3 |
| FREQ 2 | --- | --- | 2-3 | 2-3 |
| Connector information | ||
| Function | Description | Reference Designator |
| Keyboard | Miniature 6-pin | J9b |
| Mouse | Miniature 6-pin | J9a |
| Parallel port | DSUB 25-pin | J3 |
| Serial | DSUB 15-pin | J23 |
| USB | 2 USB connectors | J15 |
| Video | 15-pin VGA | J20 |
| Game | DSUB 15-pin | J5D (stacked connectors) |
| DIMM sockets | 168-pin DIMM | J18 (secondary), J19 (primary) |
| Button & headphone board | 9-pin 2mm connector (key 3) | J27 |
| CPU core voltage select | 8-pin header | J29 |
| Socket 7 | 321-pin PGA | U24 |
| Processor DLL voltage | 3-pin header | J30 |
| Internal speakers (ES models) | 2-pin header | J25 (L), J26 (R) |
| CMOS clear | 3-pin header | J17 |
| Battery socket | Battery holder | BT1 |
| CD-ROM audio | 4-pin header, key 2 | J4 |
| Socket 7 clock multiplier | 3x 3-pin headers | CLK 0 - CLK 2 |
| CPU frequency select | 3x 3-pin headers | FREQ 0 - FREQ 2 |
| Riser card slot | J16 | |
| IDE drives | 40-pin headers, key 20 | J10 (CD data & HD / primary) J11 (Zip - if used / secondary) |
| Diskette drive | 34-pin header | J2 |
| Power supply | 6-pin & 12-pin ATPWR headers | J22, J21 |