JETPRO INFOTECH COMPANY, LTD. MB-6U(MB-450CBU) Processor 80386DX/80486SX/80487SX/80486DX/80486DX2 Processor Speed 20/25/33/40/50(internal)/50/66(internal)MHz Chip Set UMC Max. Onboard DRAM 64MB SRAM Cache 64/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options 32-bit proprietary local bus card NPU Options 80387/3167 [Image] CONNECTIONS Purpose Location Purpose Location Reset switch J5 Power LED & keylock J9 Turbo LED J6 External battery J11 Turbo switch J7 32-bit proprietary S1 local bus card Speaker J8 USER CONFIGURABLE SETTINGS Function Jumper Position » CMOS memory normal operation W1 closed CMOS memory clear W1 open » Monitor type select color W2 closed Monitor type select monochrome W2 open » Factory configured-do not alter W3 open » Tag mode select write back enabled W15 open (tag installed at U45) Tag mode select write back W15 open disabled (tag not installed at U45) 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 JUMPER CONFIGURATION Size OSC2 W5 W10 W11 W19 W22 80386DX/25 50MHz open N/A N/A open N/A 80386DX/33 66MHz open N/A N/A open N/A 80386DX/40 80MHz open N/A N/A open N/A 80486SX/20 20MHz open open pins 1 closed 1 & 2 & 2 and 3 & 4 80486SX/20 40MHz open open pins 2 closed 1 & 2 & 3 and 3 & 4 80487SX/20 20MHz closed pins 2 pins 1 closed 1 & 2 & 3 & 2 and 3 & 4 80487SX/20 40MHz closed pins 2 pins 2 closed 1 & 2 & 3 & 3 and 3 & 4 80486DX/25 25MHz open pins 1 pins 1 closed 1 & 2 & 2 & 2 and 3 & 4 80486DX/25 50MHz open pins 1 pins 2 closed 1 & 2 & 2 & 3 and 3 & 4 80486DX/33 33MHz open pins 1 pins 1 closed 1 & 2 & 2 & 2 and 3 & 4 80486DX/33 66MHz open pins 1 pins 2 closed 1 & 2 & 2 & 3 and 3 & 4 80486DX/50 50MHz open pins 1 pins 1 closed 1 & 2 & 2 & 2 and 3 & 4 Note:Pins designated should be in the closed position NPU JUMPER CONFIGURATION Size W8 W20 80387 closed closed 3167 open open SRAM JUMPER CONFIGURATION Jumper 32KB 64KB 128KB 256KB W12 pins 1 & 2 pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed closed W13 pins 1 & 2 pins 1 & 2 pins 2 & 3 pins 2 & 3 closed closed closed closed W14 pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed closed W15 open open open open W17 pins 2 & 3 pins 1 & 2 pins 2 & 3 pins 1 & 2 closed closed closed closed W18 N/A N/A pins 1 & 2 pins 2 & 3 closed closed SRAM CONFIGURATION Size Cache Locations TAG 32KB (4) 8K x 8 Bank 0 (4) 16K x 4 64KB (8) 8K x 8 Banks 0 & 1 (4) 16K x 4 128KB (4) 32K x 8 Bank 0 (4) 16K x 4 256KB (8) 32K x 8 Banks 0 & 1 (4) 16K x 4