UNIDENTIFIED 80386 SX Processor 80386SX Processor Speed 16/20MHz Chip Set Unidentified Video Chip Set None Maximum Onboard Memory 4MB Maximum Video Memory None Cache None BIOS AMI Dimensions 330mm x 217mm I/O Options None NPU Options 80387SX [Image] CONNECTIONS Purpose Location Purpose Location Turbo LED JP1 Turbo switch JP4 Speaker JP2 Power LED & keylock JP5 Reset switch JP3 External battery JP15 Note: JP4 may be a 2-pin jumper. USER CONFIGURABLE SETTINGS Function Label Position ROM wait state select 2 wait J1 Pins 2 & 3 states (16MHz CPU) closed ROM wait state select 3 wait J1 Pins 1 & 2 states (20MHz CPU) closed Turbo enabled JP4 Pins 2 & 3 closed Turbo disabled JP4 Pins 1 & 2 closed NPU not installed JP6 Pins 2 & 3 closed NPU installed JP6 Pins 1 & 2 closed Parity disabled JP7 Open Parity enabled JP7 Closed RAM wait state select 0 wait JP8 Pins 1 & 2 states (only if JP9 is open) closed RAM wait state select 1 wait JP8 Pins 2 & 3 state (only if JP9 is open) closed JP8 enabled JP9 Open 8042 keyboard controller pin 29 JP9 Closed » Factory configured - do not alter JP10 Open (for AMI BIOS & 8042) Monitor type select color JP11 Pins 2 & 3 closed Monitor type select monochrome JP11 Pins 1 & 2 closed Power good signal detect from JP13 Pins 2 & 3 power supply closed Power good signal detect from JP13 Pins 1 & 2 board closed 12v battery charge disabled JP14 Pins 1 & 2 closed 12v battery charge enabled JP14 Pins 2 & 3 closed DRAM CONFIGURATION Size Bank 0 Bank 1 512KB (18) 41256 None 640KB (18) 41256 (18) 4164 1MB (18) 41256 (18) 41256 2MB (18) 411000 None 4MB (18) 411000 (18) 411000 DRAM JUMPER CONFIGURATION Size J3 512KB Pins 1 & 2, 3 & 4 closed 640KB Pins 2 & 4, 3 & 5 closed 1MB Pins 3 & 5, 4 & 6 closed 2MB Pins 1 & 3, 4 & 6 closed 4MB Pins 1 & 3, 4 & 6 closed CPU SPEED SELECTION Speed J2 16MHz Pins 3 & 4, 7 & 8 closed 20MHz Pins 3 & 4, 5 & 6 closed