UNIDENTIFIED ============ A486DX4/SIS III Processor AM486SX/80486SX/CX486DX/AM486DX/80486DX/AM486DX2/ 80486DX2/AM486DX4/80486DX4 Processor 20/25/33/40/50(internal)/50/66(internal)/75(internal)/ Speed 100(internal)MHz Chip Set SIS Video Chip None Set Maximum 64MB Onboard Memory Maximum None Video Memory Cache 32/64/128/256/512KB BIOS AMI Dimensions 254mm x 218mm I/O 32-bit VESA local bus slots (3) Options NPU None Options +------------------------------------------------------------+ | CONNECTIONS | |------------------------------------------------------------| | Purpose | Location | Purpose | Location | |---------------+----------+----------------------+----------| | Power LED & | J1 | Power LED | LED1 | | keylock | | | | |---------------+----------+----------------------+----------| | Speaker | J2 | Turbo switch | S1 | |---------------+----------+----------------------+----------| | Turbo LED | J4 | 32-bit VESA local | SL1 - | | | | bus slots | SL3 | |---------------+----------+----------------------+----------| | Reset switch | J5 | | | +------------------------------------------------------------+ +------------------------------------------------------------+ | USER CONFIGURABLE SETTINGS | |------------------------------------------------------------| | Function | Label | Position | |-------------------------------------+-------+--------------| |>> | Factory configured - do not | J7 | Unidentified | | | alter | | | |---+---------------------------------+-------+--------------| |>> | Factory configured - do not | J9 | Closed | | | alter | | | |---+---------------------------------+-------+--------------| |>> | Factory configured - do not | J11 | Open | | | alter | | | |---+---------------------------------+-------+--------------| |>> | Factory configured - do not | J12 | Open | | | alter | | | |---+---------------------------------+-------+--------------| |>> | Factory configured - do not | JP17 | Pins 1 & 2 | | | alter | | closed | |---+---------------------------------+-------+--------------| | | RC pin used for break switch | JP20 | Pins 1 & 2 | | | | | closed | |---+---------------------------------+-------+--------------| | | RC pin used for RC | JP20 | Pins 2 & 3 | | | | | closed | |---+---------------------------------+-------+--------------| | | CPU type select any CPU type | JP27 | Open | |---+---------------------------------+-------+--------------| | | CPU type select CX486S2 only | JP27 | Closed | |---+---------------------------------+-------+--------------| | | Monitor type select CGA | JP38 | Closed | |---+---------------------------------+-------+--------------| | | Monitor type select | JP38 | Open | | | monochrome/EGA/VGA | | | |---+---------------------------------+-------+--------------| |>> | CMOS memory normal operation | JP39 | Pins 1 & 2 | | | | | closed | |---+---------------------------------+-------+--------------| | | CMOS memory clear | JP39 | Pins 2 & 3 | | | | | closed | |---+---------------------------------+-------+--------------| |>> | Factory configured - do not | JP43 | Pins 2 & 3 | | | alter | | closed | |---+---------------------------------+-------+--------------| |>> | Factory configured - do not | JP71 | Open | | | alter | | | |---+---------------------------------+-------+--------------| | | Flash BIOS not installed | JP73 | Pins 1 & 2 | | | | | closed | |---+---------------------------------+-------+--------------| | | Flash BIOS installed | JP73 | Pins 2 & 3 | | | | | closed | |---+---------------------------------+-------+--------------| |>> | Factory configured - do not | JP74 | Unidentified | | | alter | | | |---+---------------------------------+-------+--------------| |>> | Factory configured - do not | JP75 | Unidentified | | | alter | | | |---+---------------------------------+-------+--------------| |>> | Factory configured - do not | JP78 | Pins 1 & 2 | | | alter | | closed | |---+---------------------------------+-------+--------------| |>> | Factory configured - do not | JP79 | Pins 2 & 3 | | | alter | | closed | |---+---------------------------------+-------+--------------| | | Turbo disabled | TBSW | Pins 1 & 2 | | | | | closed | |---+---------------------------------+-------+--------------| | | Turbo enabled | TBSW | Pins 2 & 3 | | | | | closed | |---+---------------------------------+-------+--------------| | | Turbo enabled through S1 | TBSW | Pins 4 & 5 | | | | | closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | DRAM CONFIGURATION 1 | |------------------------------------------------------------| | Size | Bank 0 | |----------------------------+-------------------------------| | 1MB | (4) 256K x 9 | |----------------------------+-------------------------------| | 4MB | (4) 1M x 9 | |----------------------------+-------------------------------| | 16MB | (4) 4M x 9 | |----------------------------+-------------------------------| | 64MB | (4) 16M x 9 | +------------------------------------------------------------+ +------------------------------------------------------------+ | DRAM CONFIGURATION 2 | |------------------------------------------------------------| | Size | Bank 1 | Bank 2 | |------------------+--------------------+--------------------| | 1MB | (1) 256K x 36 | None | |------------------+--------------------+--------------------| | 2MB | (1) 512K x 36 | None | |------------------+--------------------+--------------------| | 4MB | (1) 1M x 36 | None | |------------------+--------------------+--------------------| | 4MB | (1) 512K x 36 | (1) 512K x 36 | |------------------+--------------------+--------------------| | 8MB | (1) 2M x 36 | None | |------------------+--------------------+--------------------| | 8MB | (1) 1M x 36 | (1) 1M x 36 | |------------------+--------------------+--------------------| | 16MB | (1) 4M x 36 | None | +------------------------------------------------------------+ +------------------------------------------------------------+ | DRAM CONFIGURATION 2 (CON'T) | |------------------------------------------------------------| | Size | Bank 1 | Bank 2 | |------------------+--------------------+--------------------| | 16MB | (1) 2M x 36 | (1) 2M x 36 | |------------------+--------------------+--------------------| | 32MB | (1) 8M x 36 | None | |------------------+--------------------+--------------------| | 32MB | (1) 4M x 36 | (1) 4M x 36 | |------------------+--------------------+--------------------| | 64MB | (1) 8M x 36 | (1) 8M x 36 | +------------------------------------------------------------+ +------------------------------------------------------------+ | DRAM JUMPER CONFIGURATION | |------------------------------------------------------------| | Configuration | JP45 | JP46 | |--------------------+--------------------+------------------| | 1 | Pins 2 & 3 closed | Closed | |--------------------+--------------------+------------------| | 2 | Pins 1 & 2 closed | Open | +------------------------------------------------------------+ +------------------------------------------------------------+ | CACHE CONFIGURATION | |------------------------------------------------------------| | Size | Bank 0 | Bank 1 | TAG | |-------------+---------------+---------------+--------------| | 32KB | (4) 8K x 8 | None | (1) 8K x 8 | |-------------+---------------+---------------+--------------| | 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | |-------------+---------------+---------------+--------------| | 128KB | (4) 32K x 8 | None | (1) 8K x 8 | |-------------+---------------+---------------+--------------| | 256KB (A) | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 | |-------------+---------------+---------------+--------------| | 256KB (B) | (4) 64K x 8 | None | (1) 32K x 8 | |-------------+---------------+---------------+--------------| | 512KB | (4) 128K x 8 | None | (1) 32K x 8 | +------------------------------------------------------------+ +------------------------------------------------------------+ | CACHE JUMPER CONFIGURATION | |------------------------------------------------------------| | Size | JP30 | JP31 | JP32 | JP34 | JP35 | JP36 | JP81 | |--------+-------+-------+-------+------+------+------+------| | 32KB | 1 & 2 | 1 & 2 | 1 & 2 | Open | 1 & | 1 & | 2 & | | | | | | | 2 | 2 | 3 | |--------+-------+-------+-------+------+------+------+------| | 64KB | 2 & 3 | 1 & 2 | 1 & 2 | 1 & | 2 & | 1 & | 2 & | | | | | | 2 | 3 | 2 | 3 | |--------+-------+-------+-------+------+------+------+------| | 128KB | 2 & 3 | 2 & 3 | 1 & 2 | 2 & | 1 & | 2 & | 2 & | | | | | | 3, 4 | 2 | 3 | 3 | | | | | | & 5 | | | | |--------+-------+-------+-------+------+------+------+------| | 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 1 & | 2 & | 2 & | 2 & | | (A) | | | | 2, 3 | 3 | 3 | 3 | | | | | | & 4 | | | | |--------+-------+-------+-------+------+------+------+------| | 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & | 1 & | 2 & | 2 & | | (B) | | | | 3, 4 | 2 | 3 | 3 | | | | | | & 5 | | | | |--------+-------+-------+-------+------+------+------+------| | 512KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & | 1 & | 2 & | 1 & | | | | | | 3, 4 | 2 | 3 | 2 | | | | | | & 5 | | | | |------------------------------------------------------------| | Note: Pins designated should be in the closed position. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU SPEED SELECTION | |------------------------------------------------------------| | Speed | JP5 | JP6 | JP7 | |---------------+--------------+--------------+--------------| | 20MHz | Closed | Open | Closed | |---------------+--------------+--------------+--------------| | 25MHz | Closed | Closed | Open | |---------------+--------------+--------------+--------------| | 33MHz | Open | Closed | Closed | |---------------+--------------+--------------+--------------| | 40MHz | Closed | Open | Open | |---------------+--------------+--------------+--------------| | 50iMHz | Closed | Closed | Open | |---------------+--------------+--------------+--------------| | 50MHz | Open | Open | Closed | |---------------+--------------+--------------+--------------| | 66iMHz | Open | Closed | Closed | |---------------+--------------+--------------+--------------| | 75iMHz | Closed | Closed | Open | |---------------+--------------+--------------+--------------| | 100iMHz | Open | Closed | Closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE SELECTION | |------------------------------------------------------------| | Type | J13 | JP8 | JP10 | JP12 | JP13 | |-----------+----------+---------+---------+--------+--------| | AM486SX | Closed | 2 & 3 | 2 & 3 | Open | Open | |-----------+----------+---------+---------+--------+--------| | 80486SX | Closed | 2 & 3 | 2 & 3 | Open | Open | |-----------+----------+---------+---------+--------+--------| | CX486DX | Open | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | |-----------+----------+---------+---------+--------+--------| | AM486DX | Closed | 2 & 3 | 2 & 3 | Open | Open | |-----------+----------+---------+---------+--------+--------| | 80486DX | Closed | 2 & 3 | 2 & 3 | Open | Open | |-----------+----------+---------+---------+--------+--------| | AM486DX2 | Closed | 2 & 3 | 2 & 3 | Open | Open | |-----------+----------+---------+---------+--------+--------| | 80486DX2 | Closed | 2 & 3 | 2 & 3 | Open | Open | |-----------+----------+---------+---------+--------+--------| | AM486DX4 | Closed | 2 & 3 | Open | Open | Open | |-----------+----------+---------+---------+--------+--------| | 80486DX4 | Closed | 2 & 3 | Open | Open | Open | |------------------------------------------------------------| | Note: Pins designated should be in the closed position. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE SELECTION (CON'T) | |------------------------------------------------------------| | Type | JP18 | JP19 | JP24 | JP25 | JP28 | |----------+--------+--------+--------+--------------+-------| | AM486SX | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 | |----------+--------+--------+--------+--------------+-------| | 80486SX | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 | |----------+--------+--------+--------+--------------+-------| | CX486DX | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2, 3 & 4 | Open | |----------+--------+--------+--------+--------------+-------| | AM486DX | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 | |----------+--------+--------+--------+--------------+-------| | 80486DX | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 | |----------+--------+--------+--------+--------------+-------| | AM486DX2 | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 | |----------+--------+--------+--------+--------------+-------| | 80486DX2 | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 | |----------+--------+--------+--------+--------------+-------| | AM486DX4 | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 | |----------+--------+--------+--------+--------------+-------| | 80486DX4 | 1 & 2 | 2 & 3 | 4 & 5 | 2 & 3 | 1 & 2 | |------------------------------------------------------------| | Note: Pins designated should be in the closed position. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE SELECTION (CON'T) | |------------------------------------------------------------| | Type | JP29 | JP33 | JP37 | JP40 | |-----------+--------+--------------+-------+----------------| | AM486SX | 3 & 4 | 2 & 3 | Open | 1 & 2 or 2 & 3 | |-----------+--------+--------------+-------+----------------| | 80486SX | 3 & 4 | 2 & 3 | Open | 1 & 2 or 2 & 3 | |-----------+--------+--------------+-------+----------------| | CX486DX | 2 & 3 | 1 & 2 | 3 & 4 | 1 & 2 | |-----------+--------+--------------+-------+----------------| | AM486DX | 3 & 4 | 1 & 2, 3 & 4 | 3 & 4 | 1 & 2 or 2 & 3 | |-----------+--------+--------------+-------+----------------| | 80486DX | 3 & 4 | 1 & 2, 3 & 4 | 3 & 4 | 1 & 2 or 2 & 3 | |-----------+--------+--------------+-------+----------------| | AM486DX2 | 3 & 4 | 1 & 2, 3 & 4 | 3 & 4 | 1 & 2 or 2 & 3 | |-----------+--------+--------------+-------+----------------| | 80486DX2 | 3 & 4 | 1 & 2, 3 & 4 | 3 & 4 | 1 & 2 or 2 & 3 | |-----------+--------+--------------+-------+----------------| | AM486DX4 | 3 & 4 | 1 & 2, 3 & 4 | 3 & 4 | 1 & 2 or 2 & 3 | |-----------+--------+--------------+-------+----------------| | 80486DX4 | 3 & 4 | 1 & 2, 3 & 4 | 3 & 4 | 1 & 2 or 2 & 3 | |------------------------------------------------------------| | Note: Pins designated should be in the closed position. | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU MULTIPLIER SELECTION | |------------------------------------------------------------| | Multiplier | JP44 | |----------------------------+-------------------------------| | 2x | Pins 1 & 2 closed | |----------------------------+-------------------------------| | 2.5x | Pins 2 & 3 closed | |----------------------------+-------------------------------| | 3x | Open | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU VOLTAGE SELECTION | |------------------------------------------------------------| | Voltage | Setting | JP80 | |------------------+--------------------+--------------------| | 3.45v | UMB on board | Auto detect | |------------------+--------------------+--------------------| | 5v | UMB on board | Auto detect | |------------------+--------------------+--------------------| | 3.45v | UMB not on board | No support | |------------------+--------------------+--------------------| | 5v | UMB not on board | Closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | VL BUS WAIT STATE SELECTION | |------------------------------------------------------------| | Setting | JP4 | |----------------------------+-------------------------------| | 0 | Pins 1 & 2 closed | |----------------------------+-------------------------------| | 1 | Pins 2 & 3 closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | VL BUS SPEED SELECTION | |------------------------------------------------------------| | Speed | JP3 | |----------------------------+-------------------------------| | <= 33MHz | Pins 1 & 2 closed | |----------------------------+-------------------------------| | >33 MHz | Pins 2 & 3 closed | +------------------------------------------------------------+