UNIDENTIFIED ============ 486 MOTHER BOARD Processor 80486DX/80486DX2 Processor Speed 25/33/50(internal)/66(internal)MHz Chip Set OPTI Video Chip Set None Maximum Onboard Memory 32MB Maximum Video Memory None Cache 64/256KB BIOS AMI Dimensions 220mm x 220mm I/O Options None NPU Options None +------------------------------------------------------------+ | CONNECTIONS | |------------------------------------------------------------| | Purpose | Location | Purpose | Location | |---------------------+----------+----------------+----------| | External battery | J1 | Turbo LED | JP11 | |---------------------+----------+----------------+----------| | Speaker | J17 | Reset switch | SW1 | |---------------------+----------+----------------+----------| | Power LED & keylock | J18 | Turbo switch | SW2 | +------------------------------------------------------------+ +------------------------------------------------------------+ | USER CONFIGURABLE SETTINGS | |------------------------------------------------------------| | Function | Label | Position | |-------------------------------------+-------+--------------| | ? | CMOS memory normal operation | JP1 | Pins 2 & 3 | | | | | closed | |---+---------------------------------+-------+--------------| | | CMOS memory clear | JP1 | Pins 1 & 2 | | | | | closed | |---+---------------------------------+-------+--------------| | | Monitor type select monochrome | JP2 | Closed | |---+---------------------------------+-------+--------------| | | Monitor type select CGA/EGA/VGA | JP2 | Open | +------------------------------------------------------------+ +------------------------------------------------------------+ | DRAM CONFIGURATION | |------------------------------------------------------------| | Size | Bank 0 | Bank 1 | |------------------+--------------------+--------------------| | 1MB | (4) 256K x 9 | None | |------------------+--------------------+--------------------| | 2MB | (4) 256K x 9 | (4) 256K x 9 | |------------------+--------------------+--------------------| | 4MB | (4) 1M x 9 | None | |------------------+--------------------+--------------------| | 8MB | (4) 1M x 9 | (4) 1M x 9 | |------------------+--------------------+--------------------| | 16MB | (4) 4M x 9 | None | |------------------+--------------------+--------------------| | 20MB | (4) 1M x 9 | (4) 4M x 9 | |------------------+--------------------+--------------------| | 20MB | (4) 4M x 9 | (4) 1M x 9 | |------------------+--------------------+--------------------| | 32MB | (4) 4M x 9 | (4) 4M x 9 | +------------------------------------------------------------+ +------------------------------------------------------------+ | CACHE CONFIGURATION | |------------------------------------------------------------| | Size | Bank 0 | TAG | |------------------+--------------------+--------------------| | 64KB | (8) 8K x 8 | (1) 8K x 8 | |------------------+--------------------+--------------------| | 256KB | (8) 32K x 8 | (1) 32K x 8 | +------------------------------------------------------------+ +------------------------------------------------------------+ | CACHE JUMPER CONFIGURATION | |------------------------------------------------------------| | Size | JP4 | JP6 | JP7 | |-------------+----------------+--------------+--------------| | 64KB | Open | Open | Open | |-------------+----------------+--------------+--------------| | 256KB | Closed | Closed | Closed | |------------------------------------------------------------| | Note: Above jumpers are shown for location purposes only | | and may not be exact. | +------------------------------------------------------------+