ABIT COMPUTER CORPORATION ========================= AH4 Processor 80486SX/80486DX/CX486DX2/80486DX2 Processor 20/25/33/40/50(internal)/66(internal)MHz Speed Chip Set SIS Max. Onboard 128MB DRAM Cache 128/256/512KB BIOS Award Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (2), green PC connector NPU Options None +------------------------------------------------------------+ | CONNECTIONS | |------------------------------------------------------------| | Purpose | Location | Purpose | Location | |-------------------+-----------+-----------------+----------| | External battery | J1 | Reset switch | JW3 | |-------------------+-----------+-----------------+----------| | Green PC | JP45 | Turbo LED | JW4 | | connector | (pins 7 - | | | | | 8) | | | |-------------------+-----------+-----------------+----------| | Power LED & | JW1 | Turbo switch | JW5 | | keylock | | | | |-------------------+-----------+-----------------+----------| | Speaker | JW2 | 32-bit VESA | SL1 - | | | | local bus slots | SL3 | +------------------------------------------------------------+ +------------------------------------------------------------+ | USER CONFIGURABLE SETTINGS | |------------------------------------------------------------| | Function | Jumper | Position | |--------------------------------------+--------+------------| |>> | Factory configured - do not | J2 | Open | | | alter | | | |---+----------------------------------+--------+------------| |>> | CMOS memory normal operation | JP16 | pins 1 & 2 | | | | | closed | |---+----------------------------------+--------+------------| | | CMOS memory clear | JP16 | pins 2 & 3 | | | | | closed | |---+----------------------------------+--------+------------| |>> | Monitor type select color | JP17 | Closed | |---+----------------------------------+--------+------------| | | Monitor type select monochrome | JP17 | Open | |---+----------------------------------+--------+------------| |>> | Factory configured - do not | JP19 | Open | | | alter | | | |---+----------------------------------+--------+------------| |>> | Factory configured - do not | JP26 | Open | | | alter | | | |---+----------------------------------+--------+------------| |>> | Factory configured - do not | JP30 | Open | | | alter | | | |---+----------------------------------+--------+------------| |>> | Factory configured - do not | JP31 | Open | | | alter | | | |---+----------------------------------+--------+------------| |>> | Factory configured - do not | JP42 | Open | | | alter | | | +------------------------------------------------------------+ +------------------------------------------------------------+ | DRAM CONFIGURATION | |------------------------------------------------------------| | Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | |------+---------------+-------------+------------+----------| | 1MB | (1) 256K x 36 | NONE | NONE | NONE | |------+---------------+-------------+------------+----------| | 2MB | (1) 256K x 36 | (1) 256K x | NONE | NONE | | | | 36 | | | |------+---------------+-------------+------------+----------| | 2MB | (1) 512K x 36 | NONE | NONE | NONE | |------+---------------+-------------+------------+----------| | 4MB | (1) 512K x 36 | (1) 512K x | NONE | NONE | | | | 36 | | | |------+---------------+-------------+------------+----------| | 4MB | (1) 1M x 36 | NONE | NONE | NONE | |------+---------------+-------------+------------+----------| | 4MB | (1) 256K x 36 | (1) 256K x | (1) 512K x | NONE | | | | 36 | 36 | | |------+---------------+-------------+------------+----------| | 5MB | (1) 256K x 36 | (1) 1M x 36 | NONE | NONE | |------+---------------+-------------+------------+----------| | 6MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | NONE | | | | 36 | 36 | | |------+---------------+-------------+------------+----------| | 6MB | (1) 512K x 36 | (1) 1M x 36 | NONE | NONE | |------+---------------+-------------+------------+----------| | 8MB | (1) 256K x 36 | (1) 256K x | (1) 512K x | (1) 1M x | | | | 36 | 36 | 36 | |------+---------------+-------------+------------+----------| | 8MB | (1) 512K x 36 | (1) 512K x | (1) 1M x | NONE | | | | 36 | 36 | | |------+---------------+-------------+------------+----------| | 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE | |------+---------------+-------------+------------+----------| | 8MB | (1) 2M x 36 | NONE | NONE | NONE | |------+---------------+-------------+------------+----------| | 10MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | (1) 1M x | | | | 36 | 36 | 36 | |------+---------------+-------------+------------+----------| | 12MB | (1) 512K x 36 | (1) 512K x | (1) 1M x | (1) 1M x | | | | 36 | 36 | 36 | |------+---------------+-------------+------------+----------| | 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE | | | | | 36 | | |------+---------------+-------------+------------+----------| | 16MB | (1) 2M x 36 | (1) 2M x 36 | NONE | NONE | |------+---------------+-------------+------------+----------| | 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 | |------+---------------+-------------+------------+----------| | 17MB | (1) 256K x 36 | (1) 4M x 36 | NONE | NONE | |------+---------------+-------------+------------+----------| | 18MB | (1) 256K x 36 | (1) 256K x | (1) 4M x | NONE | | | | 36 | 36 | | |------+---------------+-------------+------------+----------| | 20MB | (1) 512K x 36 | (1) 512K x | (1) 4M x | NONE | | | | 36 | 36 | | |------+---------------+-------------+------------+----------| | 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE | NONE | |------+---------------+-------------+------------+----------| | 24MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | NONE | | | | | 36 | | |------+---------------+-------------+------------+----------| | 24MB | (1) 512K x 36 | (1) 512K x | (1) 1M x | (1) 4M x | | | | 36 | 36 | 36 | |------+---------------+-------------+------------+----------| | 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | NONE | | | | | 36 | | |------+---------------+-------------+------------+----------| | 32MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | (1) 2M x | | | | | 36 | 36 | |------+---------------+-------------+------------+----------| | 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE | |------+---------------+-------------+------------+----------| | 32MB | (1) 8M x 36 | NONE | NONE | NONE | |------+---------------+-------------+------------+----------| | 36MB | (1) 512K x 36 | (1) 512K x | (1) 4M x | (1) 4M x | | | | 36 | 36 | 36 | |------+---------------+-------------+------------+----------| | 36MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x | NONE | | | | | 36 | | +------------------------------------------------------------+ +------------------------------------------------------------+ | DRAM CONFIGURATION (CON'T) | |------------------------------------------------------------| | Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | |-------+-------------+------------+------------+------------| | 36MB | (1) 1M x 36 | (1) 8M x | NONE | NONE | | | | 36 | | | |-------+-------------+------------+------------+------------| | 40MB | (1) 1M x 36 | (1) 1M x | (1) 4M x | (1) 4M x | | | | 36 | 36 | 36 | |-------+-------------+------------+------------+------------| | 40MB | (1) 1M x 36 | (1) 1M x | (1) 8M x | NONE | | | | 36 | 36 | | |-------+-------------+------------+------------+------------| | 48MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | NONE | | | | 36 | 36 | | |-------+-------------+------------+------------+------------| | 48MB | (1) 4M x 36 | (1) 8M x | NONE | NONE | | | | 36 | | | |-------+-------------+------------+------------+------------| | 64MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | (1) 4M x | | | | 36 | 36 | 36 | |-------+-------------+------------+------------+------------| | 64MB | (1) 16M x | NONE | NONE | NONE | | | 36 | | | | |-------+-------------+------------+------------+------------| | 64MB | (1) 4M x 36 | (1) 4M x | (1) 8M x | NONE | | | | 36 | 36 | | |-------+-------------+------------+------------+------------| | 64MB | (1) 8M x 36 | (1) 8M x | NONE | NONE | | | | 36 | | | |-------+-------------+------------+------------+------------| | 65MB | (1) 256K x | (1) 16M x | NONE | NONE | | | 36 | 36 | | | |-------+-------------+------------+------------+------------| | 68MB | (1) 1M x 36 | (1) 16M x | NONE | NONE | | | | 36 | | | |-------+-------------+------------+------------+------------| | 68MB | (1) 1M x 36 | (1) 8M x | (1) 8M x | NONE | | | | 36 | 36 | | |-------+-------------+------------+------------+------------| | 72MB | (1) 1M x 36 | (1) 1M x | (1) 16M x | NONE | | | | 36 | 36 | | |-------+-------------+------------+------------+------------| | 72MB | (1) 1M x 36 | (1) 1M x | (1) 8M x | (1) 8M x | | | | 36 | 36 | 36 | |-------+-------------+------------+------------+------------| | 80MB | (1) 4M x 36 | (1) 16M x | NONE | NONE | | | | 36 | | | |-------+-------------+------------+------------+------------| | 80MB | (1) 4M x 36 | (1) 8M x | (1) 8M x | NONE | | | | 36 | 36 | | |-------+-------------+------------+------------+------------| | 96MB | (1) 4M x 36 | (1) 4M x | (1) 16M x | NONE | | | | 36 | 36 | | |-------+-------------+------------+------------+------------| | 96MB | (1) 4M x 36 | (1) 4M x | (1) 8M x | (1) 8M x | | | | 36 | 36 | 36 | |-------+-------------+------------+------------+------------| | 96MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | NONE | | | | 36 | 36 | | |-------+-------------+------------+------------+------------| | 128MB | (1) 16M x | (1) 16M x | NONE | NONE | | | 36 | 36 | | | |-------+-------------+------------+------------+------------| | 128MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | (1) 8M x | | | | 36 | 36 | 36 | +------------------------------------------------------------+ +------------------------------------------------------------+ | CACHE CONFIGURATION | |------------------------------------------------------------| | Size | Bank 0 | Bank 1 | TAG | |------------+---------------+---------------+---------------| | 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 | |------------+---------------+---------------+---------------| | 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 | |------------+---------------+---------------+---------------| | 256KB | (4) 64K x 8 | NONE | (1) 32K x 8 | |------------+---------------+---------------+---------------| | 512KB | (4) 64K x 8 | (4) 64K x 8 | (1) 32K x 8 | |------------+---------------+---------------+---------------| | 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 | +------------------------------------------------------------+ +------------------------------------------------------------+ | CACHE JUMPER CONFIGURATION | |------------------------------------------------------------| | Size | JP1 | JP2 | JP4 | JP40 | JP41 | |----------+----------+----------+---------+--------+--------| | 128KB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | |----------+----------+----------+---------+--------+--------| | 256KB | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 | |----------+----------+----------+---------+--------+--------| | 256KB | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 | |----------+----------+----------+---------+--------+--------| | 512KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | |----------+----------+----------+---------+--------+--------| | 512KB | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | |------------------------------------------------------------| | Note: Pins designated should be in the closed position. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE CONFIGURATION | |------------------------------------------------------------| | Type | JP8 | JP9 | JP11 | JP12 | JP14 | JP15 | |----------+-------+--------+-------+-------+--------+-------| | 80486SX | 2 & 3 | Open | Open | 3 & 4 | 2 & 3 | 4 & 5 | |----------+-------+--------+-------+-------+--------+-------| | CX486DX | 1 & 2 | Closed | 2 & 3 | 2 & 3 | 1 & 2, | 2 & 3 | | | | | | | 3 & 4 | | |----------+-------+--------+-------+-------+--------+-------| | 80486DX | 1 & 2 | Closed | 2 & 3 | 3 & 4 | 2 & 3 | 4 & 5 | |----------+-------+--------+-------+-------+--------+-------| | 80486DX2 | 1 & 2 | Closed | 2 & 3 | 3 & 4 | 2 & 3 | 4 & 5 | |------------------------------------------------------------| | Note: Pins designated should be in the closed position. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE CONFIGURATION (CON'T) | |------------------------------------------------------------| | Type | JP21 | JP22 | JP24 | JP25 | JP46 | |------------+---------+---------+---------+--------+--------| | 80486SX | 2 & 3 | 1 & 2 | Open | Open | 2 & 3 | |------------+---------+---------+---------+--------+--------| | CX486DX | 1 & 2 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | |------------+---------+---------+---------+--------+--------| | 80486DX | 2 & 3 | 1 & 2 | Open | Open | 2 & 3 | |------------+---------+---------+---------+--------+--------| | 80486DX2 | 2 & 3 | 1 & 2 | Open | Open | 2 & 3 | |------------------------------------------------------------| | Note: Pins designated should be in the closed position. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU SPEED CONFIGURATION | |------------------------------------------------------------| | Speed | JP5 | JP6 | JP7 | JP20 | |----------+---------+---------+---------+-------------------| | 20MHz | Closed | Open | Closed | pins 1 & 2 closed | |----------+---------+---------+---------+-------------------| | 25MHz | Closed | Closed | Open | pins 1 & 2 closed | |----------+---------+---------+---------+-------------------| | 33MHz | Open | Closed | Closed | pins 1 & 2 closed | |----------+---------+---------+---------+-------------------| | 40MHz | Closed | Open | Open | pins 2 & 3 closed | |----------+---------+---------+---------+-------------------| | 50iMHz | Closed | Closed | Open | pins 1 & 2 closed | |----------+---------+---------+---------+-------------------| | 66iMHz | Open | Closed | Closed | pins 1 & 2 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | BUS SPEEDCONFIGURATION | |------------------------------------------------------------| | CPU speed | JP29 | |----------------------------+-------------------------------| | <=33MHz | pins 1 & 2 closed | |----------------------------+-------------------------------| | >33MHz | pins 2 & 3 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | VESA WAIT STATE CONFIGURATION | |------------------------------------------------------------| | Wait states | JP28 | |----------------------------+-------------------------------| | 0 wait states | pins 1 & 2 closed | |----------------------------+-------------------------------| | 1 wait state | pins 2 & 3 closed | +------------------------------------------------------------+