JETPRO INFOTECH COMPANY, LTD. MB-4F Processor 80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2 Processor Speed 20/25/33/40/50(internal)/66(internal) Chip Set FOREX Max. Onboard DRAM 32MB SRAM Cache 64/128/256KB BIOS AMI/AWARD Dimensions 220mm x 340mm I/O Options None NPU Options 80387 [Image] CONNECTIONS Purpose Location Purpose Location External battery JP2 Turbo switch JP15 Reset switch JP8 Turbo LED JP16 Power LED & keylock JP14 Speaker JP17 USER CONFIGURABLE SETTINGS Function Jumper Position » Parity check enabled JP5 closed Parity check disabled JP5 open » Monitor type select color JP6 closed Monitor type select monochrome JP6 open » Factory configured - do not alter JP19 open 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 5MB (4) 256K x 9 (4) 1M x 9 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 20MB (4) 1M x 9 (4) 4M x 9 32MB (4) 4M x 9 (4) 4M x 9 CPU TYPE CONFIGURATION CPU JP12 JP13 JP30 W1A-W1G W2A-W2H 80486DX2 pins 1 pins 1 pins 1 pins 1 & 2 pins 1 & 2 & 2 & 2 & 2 80486DX pins 1 pins 1 pins 1 pins 1 & 2 pins 1 & 2 & 2 & 2 & 2 80487SX pins 1 pins 1 pins 2 pins 1 & 2 pins 1 & 2 & 2 & 2 & 3 80486SX pins 2 pins 2 pins 2 pins 1 & 2 pins 1 & 2 & 3 & 3 & 3 80386DX N/A N/A N/A pins 2 & 3 pins 2 & 3 Note:Pins designated should be in the closed position. SRAM CONFIGURATION Size Cache SRAM Location TAG(U26) TAG(U42) 64KB (8) 8K x 8 Banks 0 & 1 (1) 8K x 8 NONE 128KB (4) 32K x 8 Bank 0 (1) 8K x 8 NONE 256KB (8) 32K x 8 Banks 0 & 1 (1) 8K x 8 (1) 8K x 8 Note:The exact locations of U26 and U42 are unknown. SRAM JUMPER CONFIGURATION Size JP8A JP8B JP8C JP8D JP8E JP8F 64KB pins 2 pins 2 pins 1 pins 2 pins 2 pins 1 & & 3 & 3 & 2 & 3 & 3 2 128KB pins 1 pins 2 pins 1 pins 1 pins 1 pins 1 & & 2 & 3 & 2 & 2 & 2 2 256KB pins 2 pins 1 pins 2 pins 2 pins 1 pins 2 & & 3 & 2 & 3 & 3 & 2 3 Note:Pins designated should be in the closed position.