ICL CS486S Processor 80487SX/80486DX Processor Speed 20/33MHz Chip Set Unidentified Max. Onboard DRAM 26MB Cache None BIOS ICL Dimensions 330mm x 218mm I/O Options PS/2 mouse port, parallel port, serial ports (2), VGA port, floppy drive interface, IDE interface NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Parallel port CN1 Floppy drive interface CN7 Serial port 1 CN2 PS/2 mouse connector CN8 Serial port 2 CN3 Keyboard connector CN9 VGA port CN4 Front panel connector CN10 External battery CN5 Riser slot SL1 IDE interface CN6 USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » On board VGA enabled J1 pins 1 & 2 closed On board VGA disabled J1 pins 2 & 3 closed » Factory configured - do not J2 pins 1 & 2 alter closed » Factory configured - do not J3 pins 1 & 2 alter closed » Factory configured - do not J4 Closed alter » Factory configured - do not J5 pins 1 & 2 alter closed » Factory configured - do not J6 pins 1 & 2 alter closed » Factory configured - do not J7 pins 2 & 3 alter closed » BIOS type select 27512 J15 pins 1 & 2 closed BIOS type select 27256 J15 pins 2 & 3 closed » CMOS memory normal operation J18 Open CMOS memory clear J18 Closed » VGA uses 0 wait states J22 pins 2 & 3 closed VGA uses IRQ9 J22 pins 1 & 2 closed » ATREF# enabled J23 pins 1 & 2 closed ATREF# disabled J23 pins 2 & 3 closed » BIOS bit select 8-bit BIOS J71 pins 2 & 3 closed BIOS bit select 16-bit BIOS J71 pins 1 & 2 closed » Floppy drive interface enabled SW1/1 On Floppy drive interface SW1/1 Off disabled » IDE interface enabled SW1/2 On IDE interface disabled SW1/2 Off » Serial port 1 enabled SW1/3 On Serial port 1 disabled SW1/3 Off » Serial port 2 enabled SW1/4 On Serial port 2 disabled SW1/4 Off » Parallel port enabled SW1/5 On Parallel port disabled SW1/5 Off » Memory 0F0000H-0FFFFFFH SW1/6 Off available for expansion Memory 0F0000H-0FFFFFFH SW1/6 On reserved for system board » Reset disabled SW1/7 Off Reset enabled SW1/7 On » Password disabled SW1/8 On Password enabled SW1/8 Off Note: The location of jumpers J2, J4, J5, J6, &J7 and SW1 are unidentified. DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 2MB 2MB NONE NONE NONE 4MB 2MB (1) 512K x NONE NONE 36 6MB 2MB (1) 512K x (1) 512K x NONE 36 36 6MB 2MB (1) 1M x 36 NONE NONE 8MB 2MB (1) 512K x (1) 512K x (1) 512K x 36 36 36 8MB 2MB (1) 512K x (1) 1M x 36 NONE 36 10MB 2MB (1) 512K x (1) 512K x (1) 1M x 36 36 36 10MB 2MB (1) 2M x 36 NONE NONE 12MB 2MB (1) 512K x (1) 2M x 36 NONE 36 14MB 2MB (1) 512K x (1) 512K x (1) 2M x 36 36 36 14MB 2MB (1) 1M x 36 (1) 2M x 36 NONE 16MB 2MB (1) 512K x (1) 1M x 36 (1) 2M x 36 36 18MB 2MB (1) 2M x 36 (1) 2M x 36 NONE 20MB 2MB (1) 512K x (1) 2M x 36 (1) 2M x 36 36 22MB 2MB (1) 1M x 36 (1) 2M x 36 (1) 2M x 36 26MB 2MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 Note: Bank 0 is factory installed and is not configurable. CPU SPEED CONFIGURATION Speed JP102 20MHz Closed 33MHz Open