EFA CORPORATION 4MAHL, 4DMU-50AHL Processor CX486SX/CX487SX/80486SX/80486DX/ODP486SX/80486DX2 Processor 20/25/33/40/50(internal)/50/66(internal)MHz Speed Chip Set UMC Max. Onboard 64MB DRAM Cache 32/64/128/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (2), floppy drive interface, game port, IDE interface (2), parallel port, serial ports (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Serial port 2 CN2 Power LED & keylock J8 Serial port 1 CN3 Reset switch J9 Floppy drive interface CN11 Game port JP1 IDE interface CN12 Turbo switch JP31 AT bus hard drive CN13 Turbo LED JP32 interface Parallel port CN14 Speaker JP33 External battery J1 32-bit VESA Local S1 bus slot Hard drive LED (AT12) J6 32-bit VESA Local S2 bus slot AT bus hard drive LED J7 Note:The exact location of J7 is unknown. USER CONFIGURABLE SETTINGS Function Jumper Position » HDD I/O CHRDY# disabled J5 Open HDD I/O CHRDY# enabled J5 Closed » Game port enabled JP1 pins 1 & 2 closed Game port disabled JP1 pins 2 & 3 closed » IDE interface disabled JP3 pins 2 & 3 closed IDE interface enabled JP3 pins 1 & 2 closed » Floppy drive interface enabled JP4 pins 1 & 2 closed Floppy drive interface disabled JP4 pins 2 & 3 closed » AT bus IDE interface or HDC JP6 pins 2 & 3 enabled closed AT bus IDE interface or HDC JP6 pins 1 & 2 disabled closed » Factory configured - do not JP8 Closed alter » Factory configured - do not JP9 Open alter » Factory configured - do not JP10 N/A alter » AD12 local bus IDE HDD enabled JP14 pins 2 & 3 closed AD12 local bus IDE HDD disabled JP14 pins 1 & 2 closed » Factory configured - do not JP15 pins 2 & 3 alter closed » Factory configured - do not JP17 pins 2 & 3 alter closed » Factory configured - do not JP18 pins 2 & 3 alter closed 80486SX enabled JP28 pins 1 & 2 closed Other CPU enabled JP28 pins 2 & 3 closed » Factory configured - do not JP29 pins 1 & 2 alter closed » Factory configured - do not JP30 pins 1 & 2 alter closed » Factory configured - do not JP35 pins 1 & 2 alter closed » Factory configured - do not JP39 Open alter » Factory configured - do not JP40 Open alter » Factory configured - do not JP41 Open alter » Factory configured - do not JP42 Open alter » Factory configured - do not JP50 N/A alter Note: JP28 is only configurable when you have a 80486SX PQFP mounted on the mainboard. The exact location of JP41 is unknown. SERIAL PORT CONFIGURATION Port 1 (CN3) JP7 JP5 » COM1 Pins 1 & 2 closed pins 1 & 2 closed COM3 Pins 2 & 3 closed pins 1 & 2 closed Disabled N/A pins 2 & 3 closed SERIAL PORT CONFIGURATION Port 2 (CN2) JP11 JP13 » COM2 Pins 1 & 2 closed pins 1 & 2 closed COM4 Pins 2 & 3 closed pins 1 & 2 closed Disabled N/A pins 2 & 3 closed PARALLEL PORT CONFIGURATION Port JP2 JP12 » LPT2 pins 1 & 2 closed pins 1 & 2 closed LPT3 pins 2 & 3 closed pins 1 & 2 closed Disabled N/A pins 2 & 3 closed DRAM CONFIGURATION Size Bank 0 Bank 1 1MB (4) 256K x 9 NONE 1MB NONE (4) 256K x 9 2MB (4) 256K x 9 (4) 256K x 9 4MB (4) 1M x 9 NONE 4MB NONE (4) 1M x 9 5MB (4) 1M x 9 (4) 256K x 9 5MB (4) 256K x 9 (4) 1M x 9 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 16MB NONE (4) 4M x 9 17MB (4) 4M x 9 (4) 256K x 9 17MB (4) 256K x 9 (4) 4M x 9 20MB (4) 4M x 9 (4) 1M x 9 20MB (4) 1M x 9 (4) 4M x 9 32MB (4) 4M x 9 (4) 4M x 9 64MB (4) 16M x 9 NONE 64MB NONE (4) 16M x 9 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 64KB (4) 8K x 8 (4) 8K x 8 (1) 8K x 8 128KB (4) 32K x 8 NONE (1) 8K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP21 JP22 JP23 JP26 JP27 32KB Open Open Open Open pins 2 & 3 64KB Open Open Closed Open pins 1 & 2 128KB Open Closed Closed pins 1 & pins 2 & 2 3 256KB Closed Closed Closed pins 2 & pins 1 & 3 2 Note:Pins designated should be in the closed position. CPU TYPE CONFIGURATION Type SW1/1 SW1/2 SW1/3 SW1/4 SW1/5 SW1/6 SW1/7 CX486SX On Off On Off On Off Off CX487SX On Off On Off On Off Off CX486S Off Off Off On Off Off Off 80486SX Off Off Off On Off Off Off 80486DX(PQFP) On Off On Off On On On 80486DX On Off On Off On Off Off ODP486SX On On Off Off On Off Off 80486DX2 On Off On Off On Off Off CPU TYPE CONFIGURATION (CONT.) Speed JP47 JP49 CX486SX N/A pins 1 & 2 closed CX487SX N/A N/A CX486SX + CX487SX Closed pins 2 & 3 closed CX486S Open pins 1 & 2 closed 80486SX Open pins 1 & 2 closed 80486DX(PQFP) Open pins 1 & 2 closed 80486DX Open pins 1 & 2 closed ODP486SX Open pins 1 & 2 closed 80486DX2 Open pins 1 & 2 closed Note:The exact location of JP49 is unknown. CPU SPEED CONFIGURATION Speed SW2/1 SW2/2 SW2/3 JP48 20MHz Off Off Off pins 2 & 3 closed 25MHz On Off Off pins 2 & 3 closed 33MHz On On On pins 2 & 3 closed 40MHz On On Off pins 1 & 2 closed 50i MHz On Off Off pins 1 & 2 closed 50MHz Off Off On pins 1 & 2 closed 66i MHz On On On pins 1 & 2 closed VESA WAIT STATE/BUS SPEED CONFIGURATION Speed Wait states JP36 JP37 JP38 <=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