Locations and Descriptions
Note: Only things labeled with JP(number) are jumpers. Other designations are location references, connectors, etc.
All notations correspond to the diagram below.
| BT1 | Battery |
| J1 | Mouse connector |
| J2 | Keyboard connector |
| J3 | Power supply connector |
| J4 | Power supply connector |
| J5 | Riser Connector--ISA AT bus |
| J6 | Monitor signal connector |
| J7 | Serial Port A connector |
| J8 | Serial Port B connector |
| J9 | Parallel Port connector (Printer) |
| J10 | Diskette drive connector |
| J11 | Internal VGA video connector |
| J12 | Primary Hard Disk IDE (Hard Disk 1, Hard Disk 2) |
| J13 | Secondary Hard Disk IDE (Hard Disk 3 or CD-ROM, Hard Disk 4) |
| J14 | System board voltage regulator |
| J15 | Power Supply 2-pin connector (On/off switch) |
| J16 | Power Supply 3-pin connector |
| J17 | HDD/Power LED connector (Power: 1-2, HDD: 3-4) |
| J18 | VESA Video feature connector |
| J19 | External voltage regulator connector |
| J21 | Primary cache memory connector |
| J22 | Secondary cache memory connector |
| J23 | SIMM 72-pin Socket - Bank 0 |
| J24 | SIMM 72-pin Socket - Bank 1 |
| J27 | SIMM 72-pin Socket - Bank 2 |
| J28 | SIMM 72-pin Socket - Bank 3 |
| J30 | Fan +12 V dc connector |
| J31 | Modem wake-up on ring connector |
| JP1 | External speaker (Enable: 1-2, Disable: open) |
| JP2 | System board bus speed (50 Mhz: 1-3, 2-4, 60 Mhz: 1-3, 4-6, 66.6 Mhz: 3-5, 4-6) |
| JP3 | Processor Speed (75, 90, 100 Mhz: 1-3, 120, 133, 150, 166 Mhz: 1-3, 2-4) |
| JP6 | Cache memory size selection |
| JP9 | System board flash jumper (Normal: 1-2) |
| JP12 | Diskette Drive (FDD) write enable (Enable: 1-2, Disable:open) |
| JP15 | Smart Energy System SES (Enable: 2-3, Disable: 1-2) |
| JP18/JP19 | Processor Manufacturer (Intel: 1-2, Cyrix: 2-3) |
| JP20 | Regular DRAM, EDO DRAM (Normal: 1-2) |
| JP21 | Processor clock voltage selection (+5 V dc: 1-2, +3.3 V dc: 2-3) |
| JP22 | Battery/CMOS (Battery On (Normal): 1-2, Clear CMOS: open) |
| JP25 | Processor speed (75, 90, 100, 120, 133 Mhz: 1-2, 150, 166 Mhz: 2-3) |
| U3 | Processor |
| U4 | Data buffer controller |
| U5 | System controller |
| U6 | - |
| U31 | Video DRAM module connector |
| U32 | Video DRAM module connector |
| U34 | Video controller |
Sytem Board Layout - Type I-2
