AMERICAN MEGATRENDS, INC. ENTERPRISE-IV EISA VLB Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive Processor 25/33/50(internal)/50/66(internal)MHz Speed Chip Set AMI Max. Onboard 256MB DRAM Cache 256KB BIOS AMI Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port, serial ports (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Serial port 1 J2 Power LED & keylock J34 Serial port 2 J3 Turbo switch J39 Parallel port J4 Speaker J40 IDE interface LED J5 Reset switch J41 Floppy drive interface J6 Turbo LED J42 IDE interface J9 32-bit VESA Local S1 bus slot PS/2 mouse J11 32-bit VESA Local S2 bus slot USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » Factory configured - do not J10 N/A alter » Factory configured - do not J21 N/A alter » CPU low priority J31 pins 1 & 2 closed CPU high priority J31 pins 2 & 3 closed » Factory configured - do not J38 N/A alter » Factory configured - do not SW1/switch 1 Off alter » Monitor type select SW1/switch 2 Off monochrome Monitor type select color SW1/switch 2 On DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (1) 256K x None None None 36 2MB (1) 256K x (1) 256K x None None 36 36 4MB (1) 1M x 36 None None None 6MB (1) 256K x (1) 256K x (1) 1M x 36 None 36 36 8MB (1) 1M x 36 (1) 1M x 36 None None 10MB (1) 256K x (1) 256K x (1) 1M x 36 (1) 1M x 36 36 36 12MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 None 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 16MB (1) 4M x 36 None None None 18MB (1) 256K x (1) 256K x (1) 4M x 36 None 36 36 20MB (1) 1M x 36 (1) 4M x 36 None None 24MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 None 32MB (1) 4M x 36 (1) 4M x 36 None None 36MB (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 None 40MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 None 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 64MB (1) 16M x 36 None None None 128MB (1) 16M x 36 (1) 16M x 36 None None 192MB (1) 16M x 36 (1) 16M x 36 (1) 16M x None 36 256MB (1) 16M x 36 (1) 16M x 36 (1) 16M x (1) 16M x 36 36 CPU SPEED CONFIGURATION Speed J12 J13 J14 25MHz Open Open Open 33MHz Open Closed Open 50i MHz Open Open Open 50MHz Closed Open Closed 66i MHz Open Closed Open CPU TYPE CONFIGURATION PGA CPU PQFP CPU J15 J16 J43 None 80486SX,80486DX N/A N/A Open ODP486SX, 80486SX,80486DX 1&2, pins 2 Closed 80487SX, ODP586SX 3&4 & 3 ODP486SX, None 1&2, pins 2 N/A 80487SX, ODP586SX 3&4 & 3 80486DX, 80486DX2 None 1&2, pins 1 N/A 3&4 & 2 80486DX, 80486DX2 80486SX,80486DX 1&2, pins 1 Closed 3&4 & 2 80486SX None pins 2 N/A N/A & 3 80486SX 80486SX,80486DX pins 2 N/A Closed & 3 Note:Pins designated should be in the closed position. SERIAL PORT INTERRUPT SELECTION Port 1 (J2) Port 2 (J3) J22 J23 » IRQ4 IRQ3 pins 2 & 3 pins 1 & 2 closed closed IRQ3 IRQ4 pins 1 & 2 pins 2 & 3 closed closed