SCI SYSTEMS, INC. ================= SCI 486SX/DX SYSTEM BOARD Processor 80486SX/80486DX Processor 25/33MHz Speed Chip Set OPTI Max. Onboard 64MB DRAM Cache 64/256KB BIOS Unidentified Dimensions 330mm x 218mm I/O Options Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA port NPU Options None +------------------------------------------------------------+ | CONNECTIONS | |------------------------------------------------------------| | Purpose | Location | Purpose | Location | |----------------------+----------+---------------+----------| | PS/2 mouse port | J1 | IDE interface | J23 | | | | LED | | |----------------------+----------+---------------+----------| | IDE interface | J5 | Reset switch | J24 | |----------------------+----------+---------------+----------| | Floppy drive | J6 | Speaker | J25 | | interface | | | | |----------------------+----------+---------------+----------| | Parallel port | J8 | Power LED & | J26 | | | | keylock | | |----------------------+----------+---------------+----------| | Serial port 2 | J9 | VGA port | J27 | |----------------------+----------+---------------+----------| | Serial port 1 | J10 | | | +------------------------------------------------------------+ +------------------------------------------------------------+ | USER CONFIGURABLE SETTINGS | |------------------------------------------------------------| | Function | Jumper/Switch | Position | |-------------------------------+---------------+------------| |>> | Monitor type select color | W1 | pins 1 & 2 | | | | | closed | |---+---------------------------+---------------+------------| | | Monitor type select | W1 | pins 2 & 3 | | | monochrome | | closed | |---+---------------------------+---------------+------------| |>> | CMOS memory normal | W2 | pins 1 & 2 | | | operation | | closed | |---+---------------------------+---------------+------------| | | CMOS memory clear | W2 | pins 2 & 3 | | | | | closed | |---+---------------------------+---------------+------------| |>> | SYSCLK enabled | W3 | pins 2 & 3 | | | | | closed | |---+---------------------------+---------------+------------| | | SYSCLK/2 enabled | W3 | pins 1 & 2 | | | | | closed | |---+---------------------------+---------------+------------| |>> | On board VGA enabled | W10 | pins 1 & 2 | | | | | closed | |---+---------------------------+---------------+------------| | | On board VGA disabled | W10 | pins 2 & 3 | | | | | closed | |---+---------------------------+---------------+------------| |>> | Video horizontal scan | SW1/5 | On | | | rate select 31.5 kHz | | | |---+---------------------------+---------------+------------| | | Video horizontal scan | SW1/5 | Off | | | rate select 40kHz | | | |---+---------------------------+---------------+------------| |>> | Video memory select 512KB | SW1/6 | On | |---+---------------------------+---------------+------------| | | Video memory select 1MB | SW1/6 | Off | +------------------------------------------------------------+ +------------------------------------------------------------+ | DRAM CONFIGURATION | |------------------------------------------------------------| | Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | |------+-------------+-------------+------------+------------| | 1MB | (1) 256K x | NONE | NONE | NONE | | | 36 | | | | |------+-------------+-------------+------------+------------| | 2MB | (1) 256K x | (1) 256K x | NONE | NONE | | | 36 | 36 | | | |------+-------------+-------------+------------+------------| | 4MB | (1) 1M x 36 | NONE | NONE | NONE | |------+-------------+-------------+------------+------------| | 5MB | (1) 256K x | (1) 1M x 36 | NONE | NONE | | | 36 | | | | |------+-------------+-------------+------------+------------| | 6MB | (1) 256K x | (1) 256K x | (1) 1M x | NONE | | | 36 | 36 | 36 | | |------+-------------+-------------+------------+------------| | 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE | |------+-------------+-------------+------------+------------| | 9MB | (1) 256K x | (1) 1M x 36 | (1) 1M x | NONE | | | 36 | | 36 | | |------+-------------+-------------+------------+------------| | 10MB | (1) 256K x | (1) 256K x | (1) 1M x | (1) 1M x | | | 36 | 36 | 36 | 36 | |------+-------------+-------------+------------+------------| | 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE | | | | | 36 | | |------+-------------+-------------+------------+------------| | 13MB | (1) 256K x | (1) 1M x 36 | (1) 1M x | (1) 1M x | | | 36 | | 36 | 36 | |------+-------------+-------------+------------+------------| | 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x | | | | | 36 | 36 | |------+-------------+-------------+------------+------------| | 16MB | (1) 4M x 36 | NONE | NONE | NONE | |------+-------------+-------------+------------+------------| | 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE | NONE | |------+-------------+-------------+------------+------------| | 20MB | (1) 4M x 36 | (1) 1M x 36 | NONE | NONE | |------+-------------+-------------+------------+------------| | 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | NONE | | | | | 36 | | |------+-------------+-------------+------------+------------| | 24MB | (1) 1M x 36 | (1) 4M x 36 | (1) 1M x | NONE | | | | | 36 | | |------+-------------+-------------+------------+------------| | 24MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | NONE | | | | | 36 | | |------+-------------+-------------+------------+------------| | 28MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | (1) 1M x | | | | | 36 | 36 | |------+-------------+-------------+------------+------------| | 28MB | (1) 1M x 36 | (1) 4M x 36 | (1) 1M x | (1) 1M x | | | | | 36 | 36 | |------+-------------+-------------+------------+------------| | 28MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x | | | | | 36 | 36 | |------+-------------+-------------+------------+------------| | 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE | |------+-------------+-------------+------------+------------| | 36MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE | | | | | 36 | | |------+-------------+-------------+------------+------------| | 36MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE | | | | | 36 | | |------+-------------+-------------+------------+------------| | 36MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | NONE | | | | | 36 | | |------+-------------+-------------+------------+------------| | 40MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | (1) 4M x | | | | | 36 | 36 | |------+-------------+-------------+------------+------------| | 40MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x | (1) 1M x | | | | | 36 | 36 | |------+-------------+-------------+------------+------------| | 40MB | (1) 4M x 36 | (1) 1M x 36 | (1) 4M x | (1) 1M x | | | | | 36 | 36 | |------+-------------+-------------+------------+------------| | 40MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | (1) 1M x | | | | | 36 | 36 | +------------------------------------------------------------+ +------------------------------------------------------------+ | DRAM CONFIGURATION (CON'T) | |------------------------------------------------------------| | Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | |------+-------------+-------------+------------+------------| | 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | NONE | | | | | 36 | | |------+-------------+-------------+------------+------------| | 52MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x | | | | | 36 | 36 | |------+-------------+-------------+------------+------------| | 52MB | (1) 4M x 36 | (1) 1M x 36 | (1) 4M x | (1) 4M x | | | | | 36 | 36 | |------+-------------+-------------+------------+------------| | 52MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 1M x | | | | | 36 | 36 | |------+-------------+-------------+------------+------------| | 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x | | | | | 36 | 36 | +------------------------------------------------------------+ +------------------------------------------------------------+ | CACHE CONFIGURATION | |------------------------------------------------------------| | Size | Bank 0 | Bank 1 | TAG | |------------+---------------+---------------+---------------| | 64KB | (4) 8K x 8 | (4) 8K x 8 | (2) 16K x 4 | |------------+---------------+---------------+---------------| | 256KB | (4) 32K x 8 | (4) 32K x 8 | (2) 16K x 4 | +------------------------------------------------------------+ +------------------------------------------------------------+ | CACHE JUMPER CONFIGURATION | |------------------------------------------------------------| | Size | W4 | W5 | W9 | W11 | |-------+-------------+------------+------------+------------| | 64KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | | | closed | closed | closed | closed | |-------+-------------+------------+------------+------------| | 256KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | | | closed | closed | closed | closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE CONFIGURATION | |------------------------------------------------------------| | Type | W6 | W7 | W8 | |-------+-----------------+-----------------+----------------| | 486SX | pins 2 & 3 | pins 2 & 3 | N/A | | | closed | closed | | |-------+-----------------+-----------------+----------------| | 487SX | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | | | closed | closed | closed | |-------+-----------------+-----------------+----------------| | 486DX | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | | | closed | closed | closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | VIDEO CONFIGURATION (800 X 600) | |------------------------------------------------------------| | Refresh rate | SW1/1 | SW1/2 | |-------------------------+-----------------+----------------| |>> | 60Hz | Off | On | |------+------------------+-----------------+----------------| | | 56Hz | Off | Off | |------+------------------+-----------------+----------------| | | 56Hz | On | On | |------+------------------+-----------------+----------------| | | 72Hz | On | Off | +------------------------------------------------------------+ +------------------------------------------------------------+ | VIDEO CONFIGURATION (1024 X 768) | |------------------------------------------------------------| | Refresh rate | SW1/3 | SW1/4 | |-------------------------+-----------------+----------------| |>> | Interlaced | Off | Off | |----+--------------------+-----------------+----------------| | | 60Hz | Off | On | |----+--------------------+-----------------+----------------| | | 70Hz | On | Off | |----+--------------------+-----------------+----------------| | | 72Hz | On | On | +------------------------------------------------------------+ +------------------------------------------------------------+ | VIDEO MEMORY CONFIGURATION | |------------------------------------------------------------| | Size | Bank 0 | Bank 1 | |---------------+----------------------+---------------------| | 512KB | (4) 256K x 4 | NONE | |---------------+----------------------+---------------------| | 1MB | (4) 256K x 4 | (4) 256K x 4 | |------------------------------------------------------------| | Note: Bank 0 is factory installed and is not configurable. | +------------------------------------------------------------+