AMERICAN MEGATRENDS, INC. ========================= Omni Business Partner Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive Processor 20/25/33/50(internal)/66(internal)MHz Speed Chip Set AMI Max. Onboard 20MB DRAM Cache 256KB BIOS AMI 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 | |----------------------+----------+---------------+----------| | IDE interface | J2 | RJ48 10BaseT | J35 | | | | connector | | |----------------------+----------+---------------+----------| | Onboard battery | J5 | SCSI LED | J37 | |----------------------+----------+---------------+----------| | PS/2 mouse connector | J6 | Speaker | J38 | |----------------------+----------+---------------+----------| | External battery | J8 | Reset switch | J39 | |----------------------+----------+---------------+----------| | Serial port 2 | J11 | Turbo switch | J40 | |----------------------+----------+---------------+----------| | Secondary cache | J12 | BNC 10Base2 | J41 | | connector | | connector | | |----------------------+----------+---------------+----------| | SCSI connector | J15 | IDE interface | J42 | | (internal) | | LED | | |----------------------+----------+---------------+----------| | Serial port 1 | J16 | Turbo LED | J43 | |----------------------+----------+---------------+----------| | SCSI 1 | J17 | Keyboard lock | J44 | | | | connector | | |----------------------+----------+---------------+----------| | VGA port | J31 | Parallel port | P3 | |----------------------+----------+---------------+----------| | AUI connector | J32 | Floppy drive | P4 | | | | interface | | +------------------------------------------------------------+ +------------------------------------------------------------+ | USER CONFIGURABLE SETTINGS | |------------------------------------------------------------| | Function | Jumper/Switch | Position | |-------------------------------+---------------+------------| |>> | PowerGood signal from | J1 | Open | | | DS1231 | | | |---+---------------------------+---------------+------------| | | PowerGood signal not from | J1 | Closed | | | DS1231 (not installed) | | | |---+---------------------------+---------------+------------| |>> | Factory configured do not | J3 | N/A | | | alter | | | |---+---------------------------+---------------+------------| |>> | Flash ROM programming | J7 | Open | | | disabled | | | |---+---------------------------+---------------+------------| | | Flash ROM programming | J7 | Closed | | | enabled | | | |---+---------------------------+---------------+------------| |>> | Factory configured do not | J20 | Closed | | | alter | | | |---+---------------------------+---------------+------------| |>> | Video memory DRAM cycle | J21 | Open | | | select (6 MCLK RAS) | | | |---+---------------------------+---------------+------------| | | Video memory DRAM cycle | J21 | Closed | | | select (7 MCLK RAS) | | | |---+---------------------------+---------------+------------| |>> | VGA controller IRQ NOT | J22 | Open | | | routed to IRQ9 | | | |---+---------------------------+---------------+------------| | | VGA controller IRQ routed | J22 | Closed | | | to IRQ9 | | | |---+---------------------------+---------------+------------| |>> | Enables IRQ12 for onboard | J27 | pins 2 & 3 | | | PS/2 mouse | | closed | |---+---------------------------+---------------+------------| | | Disables IRQ12 for | J27 | pins 1 & 2 | | | onboard PS/2 mouse | | closed | |---+---------------------------+---------------+------------| |>> | Enables IRQ10 for NCR | J28 | Closed | | | SCSI I/O processor | | | |---+---------------------------+---------------+------------| | | Disables IRQ10 for NCR | J28 | Open | | | SCSI I/O processor | | | |---+---------------------------+---------------+------------| |>> | Enables IRQ11 for onboard | J29 | Closed | | | LAN controller | | | |---+---------------------------+---------------+------------| | | Disables IRQ11 for | J29 | Open | | | onboard LAN controller | | | |---+---------------------------+---------------+------------| |>> | VGA onboard controller | J33 | Closed | | | enabled | | | |---+---------------------------+---------------+------------| | | VGA onboard controller | J33 | Open | | | disabled | | | |---+---------------------------+---------------+------------| |>> | CMOS memory normal | J34 | pins 2 & 3 | | | operation | | closed | |---+---------------------------+---------------+------------| | | CMOS memory clear | J34 | pins 1 & 2 | | | | | closed | |---+---------------------------+---------------+------------| |>> | Onboard SCSI termination | J36 | pins 2 & 3 | | | chip enabled | | closed | |---+---------------------------+---------------+------------| | | Onboard SCSI termination | J36 | pins 1 & 2 | | | chip disabled | | closed | |---+---------------------------+---------------+------------| |>> | Factory configured do not | SW1/1 | Off | | | alter | | | |---+---------------------------+---------------+------------| |>> | Monitor type select | SW1/2 | Off | | | monochrome | | | |---+---------------------------+---------------+------------| | | Monitor type select color | SW1/2 | On | |---+---------------------------+---------------+------------| | | 64KB Cache enabled | SW2/1, 2, 3, | Off | | | | 4 | | |---+---------------------------+---------------+------------| | | 256KB Cache enabled | SW2/1, 2, 3, | On | | | | 4 | | +------------------------------------------------------------+ +------------------------------------------------------------+ | SERIAL PORT IRQ CONFIGURATION | |------------------------------------------------------------| | Port 1 | Port 2 (J11) | J25 | J26 | | (J16) | | | | |-------------+--------------+---------------+---------------| |>> | IRQ4 | IRQ3 | pins 1 & 2 | pins 1 & 2 | | | | | closed | closed | |----+--------+--------------+---------------+---------------| | | IRQ3 | IRQ4 | pins 2 & 3 | pins 2 & 3 | | | | | closed | closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU FREQUENCY CONFIGURATION | |------------------------------------------------------------| | Frequency | J9 | J10 | |------------------------+------------------+----------------| |>> | 33 Mhz | Open | Open | |----+-------------------+------------------+----------------| | | 25 MHz | Closed | Open | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE CONFIGURATION | |------------------------------------------------------------| | CPU Type | J13 | J14 | |--------------------+-------------------+-------------------| | 80486SX | pins 1 & 2 closed | pins 2 & 3 closed | |--------------------+-------------------+-------------------| | 80487SX | pins 2 & 3 closed | all closed | |--------------------+-------------------+-------------------| | 80486DX | pins 1 & 2 closed | all closed | |--------------------+-------------------+-------------------| | ODP486SX | pins 2 & 3 closed | all closed | |--------------------+-------------------+-------------------| | 80486DX2 | pins 1 & 2 closed | all closed | |--------------------+-------------------+-------------------| | Pentium Overdrive | pins 2 & 3 closed | all closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | MEMORY CLOCK SPEED OF THE CLGD5426 | |------------------------------------------------------------| | Frequency | J23 | J24 | |--------------------+-------------------+-------------------| | 50.11 MHz | Closed | Closed | |--------------------+-------------------+-------------------| | 44.74 MHz | Closed | Open | |--------------------+-------------------+-------------------| | 41.16 MHz | Open | Closed | |--------------------+-------------------+-------------------| | 37.58 MHz | Open | Open | +------------------------------------------------------------+ +------------------------------------------------------------+ | 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 | | | |------+---------------+-------------+----------+------------| | 4MB | (1) 1M x 36 | NONE | NONE | NONE | |------+---------------+-------------+----------+------------| | 6MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | NONE | | | | 36 | 36 | | |------+---------------+-------------+----------+------------| | 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE | |------+---------------+-------------+----------+------------| | 10MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | (1) 256K x | | | | 36 | 36 | 36 | |------+---------------+-------------+----------+------------| | 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE | | | | | 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 | |------+---------------+-------------+----------+------------| | 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | NONE | | | | | 36 | | |------+---------------+-------------+----------+------------| | 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE | |------+---------------+-------------+----------+------------| | 36MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x | NONE | | | | | 36 | | |------+---------------+-------------+----------+------------| | 40MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | (1) 4M x | | | | | 36 | 36 | |------+---------------+-------------+----------+------------| | 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | NONE | | | | | 36 | | |------+---------------+-------------+----------+------------| | 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x | | | | | 36 | 36 | +------------------------------------------------------------+