INFORMTECH INTERNATIONAL, INC. IT486SL-50MHz Ver. 2.0 Processor 80486SX/80487SX/80486DX Processor Speed 20/25/33/50MHz Chip Set OPTI Max. Onboard DRAM 40MB SRAM Cache 64/256KB BIOS OPTI Dimensions 218mm x 330mm I/O Options Auxiliary keyboard connector NPU Options 4167 [Image] CONNECTIONS Purpose Location Purpose Location External battery J11 Turbo LED JP11 Power LED & keylock J20 Reset switch SW1 Speaker J21 Turbo switch SW2 Auxiliary keyboard J22 USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select monochrome JP2 open Monitor type select color JP2 closed » Factory configured - do not alter JP6 open » External battery type select JP14 pins 1 & 3 lithium 3.6VDC closed External battery type select JP14 pins 1 & 2 alkaline 4.5VDC closed External battery type select four JP14 pins 3 & 4 pack AA 6VDC closed » Factory configured - do not alter JP15 open I/O bus select zero wait states JP16 closed JP17 closed I/O bus select one wait state JP16 closed JP17 open I/O bus select two wait states JP16 open JP17 closed I/O bus select three wait states JP16 open JP17 open » Factory configured - do not alter JP18 open DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (4) 256K x 9 NONE NONE NONE 2MB (4) 256K x 9 (4) 256K x 9 NONE NONE 4MB (4) 1M x 9 NONE NONE NONE 5MB (4) 256K x 9 (4) 1M x 9 NONE NONE 8MB (4) 1M x 9 (4) 1M x 9 NONE NONE 12MB (4) 1M x 9 (4) 1M x 9 (1) 4M x 36 NONE 16MB (4) 4M x 9 NONE NONE NONE 16MB (4) 1M x 9 (4) 1M x 9 (1) 4M x 36 (1) 4M x 36 20MB (4) 1M x 9 (4) 4M x 9 NONE NONE 24MB (4) 1M x 9 (4) 4M x 9 (1) 4M x 36 NONE 28MB (4) 1M x 9 (4) 4M x 9 (1) 4M x 36 (1) 4M x 36 32MB (4) 4M x 9 (4) 4M x 9 NONE NONE 36MB (4) 4M x 9 (4) 4M x 9 (1) 4M x 36 NONE 40MB (4) 4M x 9 (4) 4M x 9 (1) 4M x 36 (1) 4M x 36 CPU TYPE CONFIGURATION CPU Type JP3 JP4 JP5 80486DX pins 2 & 3 closed pins 1 & 2 closed closed 80487SX pins 1 & 2 closed pins 1 & 2 closed closed 80486SX open open pins 2 & 3 closed SRAM JUMPER CONFIGURATION Size JP9 JP10 JP12 64KB open open open 256KB closed closed closed SRAM CONFIGURATION Size Bank 0 TAG Dirty Bit (U64) 64KB (8) 8K x 8 (2) 16K x 4 (1) 64K x 1 256KB (8) 32K x 8 (2) 16K x 4 (1) 64K x 1 CPU SPEED CONFIGURATION CPU Speed JP7 JP13 50MHz pins 1 & 2 closed pins 2 & 3 closed 33MHz pins 2 & 3 closed pins 1 & 2 closed 25MHz pins 2 & 3 closed pins 2 & 3 closed