EFA CORPORATION 4M50HL2S Processor 80486SX/80486DX/80486DX2/Pentium Overdrive Processor Speed 20/25/33/40/50(internal)/50/66(internal)MHz Chip Set UMC Max. Onboard DRAM32MB Cache 64/128/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location External battery J1 Reset switch J10 Turbo LED J7 32-bit VESA Local bus S1 slot Speaker J8 32-bit VESA Local bus S2 slot Power LED & keylock J9 USER CONFIGURABLE SETTINGS Function Jumper Position » Factory configured - do not J3 N/A alter » Speed set Turbo J11 Open Speed normal J11 Closed » CPU type package PGA J12 pins 2 & 3 closed CPU type package PQFP J12 pins 1 & 2 closed » Factory configured - do not J13 pins 2 & 3 alter closed » Western Digital HDD WDAC2340 J17 pins 2 & 3 installed closed Western Digital HDD WDAC2340 not J17 pins 1 & 2 installed closed » CMOS memory normal operation W1 pins 1 & 2 closed CMOS memory clear W1 pins 2 & 3 closed » On board battery enabled W2 Closed On board battery disabled W2 Open Note:The exact location of W2 is unknown. 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 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 64KB (4) 8K x 8 (4) 8K x 8 8K x 8 128KB (4) 32K x 8 NONE 8K x 8 256KB (4) 32K x 8 (4) 32K x 8 32K x 8 CACHE JUMPER CONFIGURATION Size W4 W5 W6 W7 W8 W9 W10 W11 64KB 1 & 1 & 1 & Open Open Open Open Open 2 2 2 128KB 2 & 1 & 2 & 1 & 2 Open Closed Open Closed 3 2 3 256KB 2 & 2 & 1 & 2 & 3 Closed Closed Closed Closed 3 3 2 Note:Pins designated should be in the closed position. CPU TYPE CONFIGURATION Type SW3/1 SW3/2 SW3/3 SW3/4 SW3/5 SW3/6 80486SX/20 Off Off Off On On Off 80486SX/25 Off Off Off Off On Off 80486SX/33 Off Off Off Off On Off 80486DX Off On On Off Off Off Pentium Off On On Off Off Off Overdrive CPU TYPE CONFIGURATION Type J6 J13 J14 J15 JP1 JP3 80486SX pins 2 pins 2 pins 1 pins 2 pins 1 pins 2 & 3 & 3 & 2 & 3 & 2 & 3 80486DX pins 2 pins 2 pins 1 pins 2 pins 1 pins 2 & 3 & 3 & 2 & 3 & 2 & 3 80486DX2 pins 2 pins 2 pins 1 pins 2 pins 1 pins 2 & 3 & 3 & 2 & 3 & 2 & 3 ODP486SX pins 2 pins 2 pins 1 pins 2 pins 1 pins 2 & 3 & 3 & 2 & 3 & 2 & 3 Note:Pins designated should be in the closed position. CPU SPEED CONFIGURATION Speed SW1/1 SW1/2 SW1/3 SW1/4 20MHz Off Off On Off 25MHz On On Off On 33MHz On Off On On 40MHz Off Off On Off 50i MHz On On Off On 50MHz Off Off Off Off 66i MHz On Off On On VESA WAIT STATE/BUS SPEED CONFIGURATION CPU speed Wait states J4 J5 J16 £ 33MHz 0 wait pins 1 & 2 pins 1 & 2 pins 1 & 2 states closed closed closed > 33MHz 1 wait state pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed