DELL COMPUTER CORPORATION ========================= DIMENSION 486SX/25, 486DX/33, 486DX2/50 Processor 80486SX/80487SX/80486DX/80486DX2 Processor Speed 25/33/50(internal)/50/66(internal) Chip Set OPTI Max. Onboard DRAM 64MB SRAM Cache 64/256KB (optional module) BIOS AMI Dimensions 330mm x 218mm I/O Options Floppy drive interface, IDE interface, bus mouse port parallel port, serial port (2), VGA port NPU Options None +------------------------------------------------------------+ | CONNECTIONS | |------------------------------------------------------------| | Purpose | Location | Purpose | Location | |----------------------+----------+---------------+----------| | PS/2 mouse | 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 (COM B) | J9 | VGA port | J27 | |----------------------+----------+---------------+----------| | Serial port (COM A) | J10 | | | +------------------------------------------------------------+ +------------------------------------------------------------+ | USER CONFIGURABLE SETTINGS | |------------------------------------------------------------| | Function | Jumper | Position | |------------------------------------+--------+--------------| |>> | Monitor type select color | W1 | pins 1 & 2 | | | | | closed | |---+--------------------------------+--------+--------------| | | Monitor type select monochrome | W1 | pins 2 & 3 | | | | | closed | |---+--------------------------------+--------+--------------| |>> | CMOS memory normal operation | W2 | pins 1 & 2 | | | | | closed | |---+--------------------------------+--------+--------------| | | CMOS memory clear | W2 | pins 2 & 3 | | | | | closed | |---+--------------------------------+--------+--------------| |>> | I/O bus speed select SYSCLK/2 | W3 | pins 2 & 3 | | | | | closed | |---+--------------------------------+--------+--------------| | | I/O bus speed select SYSCLK/1 | W3 | pins 1 & 2 | | | | | closed | |---+--------------------------------+--------+--------------| |>> | On-board VGA enabled | W10 | pins 1 & 2 | | | | | closed | |---+--------------------------------+--------+--------------| | | On-board VGA disabled | W10 | pins 2 & 3 | | | | | closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | 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 | | | |------+-------------+-------------+------------+------------| | 3MB | (1) 256K x | (1) 256K x | (1) 256K x | NONE | | | 36 | 36 | 36 | | |------+-------------+-------------+------------+------------| | 4MB | (1) 256K x | (1) 256K x | (1) 256K x | (1) 256K x | | | 36 | 36 | 36 | 36 | |------+-------------+-------------+------------+------------| | 4MB | (1) 1M x 36 | NONE | NONE | NONE | |------+-------------+-------------+------------+------------| | 5MB | (1) 1M x 36 | (1) 256K x | NONE | NONE | | | | 36 | | | |------+-------------+-------------+------------+------------| | 6MB | (1) 1M x 36 | (1) 256K x | (1) 256K x | NONE | | | | 36 | 36 | | |------+-------------+-------------+------------+------------| | 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE | |------+-------------+-------------+------------+------------| | 9MB | (1) 1M x 36 | (1) 1M x 36 | (1) 256K x | NONE | | | | | 36 | | |------+-------------+-------------+------------+------------| | 10MB | (1) 1M x 36 | (1) 1M x 36 | (1) 256K x | (1) 256K x | | | | | 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 | |------+-------------+-------------+------------+------------| | 17MB | (1) 4M x 36 | (1) 256K x | NONE | NONE | | | | 36 | | | |------+-------------+-------------+------------+------------| | 18MB | (1) 4M x 36 | (1) 256K x | (1) 256K x | NONE | | | | 36 | 36 | | |------+-------------+-------------+------------+------------| | 20MB | (1) 4M x 36 | (1) 1M x 36 | NONE | NONE | |------+-------------+-------------+------------+------------| | 24MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | NONE | | | | | 36 | | |------+-------------+-------------+------------+------------| | 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE | |------+-------------+-------------+------------+------------| | 33MB | (1) 4M x 36 | (1) 4M x 36 | (1) 256K x | NONE | | | | | 36 | | |------+-------------+-------------+------------+------------| | 34MB | (1) 4M x 36 | (1) 4M x 36 | (1) 256K x | (1) 256K x | | | | | 36 | 36 | |------+-------------+-------------+------------+------------| | 36MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | NONE | | | | | 36 | | |------+-------------+-------------+------------+------------| | 40MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | (1) 1M 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 | +------------------------------------------------------------+ +------------------------------------------------------------+ | CPU TYPE CONFIGURATION | |------------------------------------------------------------| | CPU | Jumper W6 | Jumper W7 | Jumper W8 | |----------+----------------+----------------+---------------| | 80486DX2 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | | | closed | closed | closed | |----------+----------------+----------------+---------------| | 80486DX | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | | | closed | closed | closed | |----------+----------------+----------------+---------------| | 80487SX | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | | | closed | closed | closed | |----------+----------------+----------------+---------------| | 80486SX | pins 2 & 3 | pins 2 & 3 | open | | | closed | closed | | +------------------------------------------------------------+ +------------------------------------------------------------+ | SRAM JUMPER CONFIGURATION | |------------------------------------------------------------| | Size | Jumper W4 | Jumper W5 | Jumper W9 | |-------+-----------------+-----------------+----------------| | 64KB | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | | | closed | closed | closed | |-------+-----------------+-----------------+----------------| | 256KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | | | closed | closed | closed | +------------------------------------------------------------+ +------------------------------------------------------------+ | VIDEO SWITCH CONFIGURATION (SW1) | |------------------------------------------------------------| | Mode |switch 1|switch 2|switch 3|switch 4|switch | | | | | | | 5 | |----------------+--------+--------+--------+--------+-------| | 56Hz vertical | open | open | N/A | N/A | N/A | | refresh | | | | | | |----------------+--------+--------+--------+--------+-------| | 60Hz vertical | open | closed | N/A | N/A | N/A | | refresh | | | | | | |----------------+--------+--------+--------+--------+-------| | 72Hz vertical | closed | open | N/A | N/A | N/A | | refresh | | | | | | |----------------+--------+--------+--------+--------+-------| | Enable | N/A | N/A | open | open | N/A | | interlaced | | | | | | |----------------+--------+--------+--------+--------+-------| | 60Hz | N/A | N/A | open | closed | N/A | | non-interlaced | | | | | | |----------------+--------+--------+--------+--------+-------| | 72Hz | N/A | N/A | closed | open | N/A | | non-interlaced | | | | | | |----------------+--------+--------+--------+--------+-------| | 31.5KHz | N/A | N/A | N/A | N/A | open | |horizontal scan | | | | | | | rate | | | | | | |----------------+--------+--------+--------+--------+-------| |40KHz horizontal| N/A | N/A | N/A | N/A |closed | | scan rate | | | | | | +------------------------------------------------------------+ +------------------------------------------------------------+ | VRAM CONFIGURATION | |------------------------------------------------------------| | Size | VRAM | SW1/switch 6 | |------------------+--------------------+--------------------| | 512KB | (2) 256K x 4 | closed | |------------------+--------------------+--------------------| | 1MB | (4) 256K x 4 | open | +------------------------------------------------------------+