ADVANCED COMPUTER TECHNOLOGY, LTD. T486SX-20/T486DX-25/T486DX-33 Processor 80486SX/80487SX/80486DX Processor Speed 20/25/33MHz Chip Set ACT Max. Onboard DRAM 32MB Cache None BIOS AMI Dimensions 330mm x 218mm I/O Options None NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Power LED & Keylock JP22 Speaker JP28 Reset switch JP24 Turbo switch JP30 External battery JP25 Turbo LED JP31 USER CONFIGURABLE SETTINGS Function Jumper Position » RAM speed select fast (40 to 70ns) JP4 & JP5 pins 1 & 2 closed RAM speed select slow (80 to JP4 & JP5 pins 2 & 3 120ns) closed » Video BIOS cacheable JP7 pins 1 & 2 closed Video BIOS non-cacheable JP7 pins 2 & 3 closed » Factory configured - do not alter JP11 N/A » Monitor type select color JP23 pins 2 & 3 closed Monitor type select monochrome JP23 pins 1 & 2 closed » Battery select internal JP26 pins 1 & 2 closed Battery select external JP26 pins 2 & 3 closed » Power good signal detect from JP27 pins 1 & 2 power supply closed Power good signal detect from JP27 pins 2 & 3 board closed DRAM CONFIGURATION Size Bank 0 Bank 1 1MB (4) 256K x 9 NONE 2MB (4) 256K x 9 (4) 256K x 9 4MB (4) 1M x 9 NONE 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 32MB (4) 4M x 9 (4) 4M x 9 DRAM JUMPER CONFIGURATION Size JP8 JP9 JP10 1MB pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed 2MB pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed 4MB pins 1 & 2 pins 2 & 3 pins 1 & 2 closed closed closed 8MB pins 1 & 2 pins 2 & 3 pins 2 & 3 closed closed closed 16MB pins 2 & 3 pins 2 & 3 pins 1 & 2 closed closed closed 32MB pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed CPU TYPE CONFIGURATION Type JP2 JP3 JP6 JP12 80486SX - pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 1 & 2 20MHz closed closed closed closed 80486SX - pins 2 & 3 pins 1 & 2 pins 1 & 2 pins 1 & 2 33MHz closed closed closed closed 80487SX - pins 1 & 2 pins 1 & 2 pins 2 & 3 pins 2 & 3 20MHz closed closed closed closed 80486DX - pins 2 & 3 pins 2 & 3 pins 2 & 3 pins 2 & 3 25/33 MHz closed closed closed closed