NORTHGATE COMPUTER SYSTEMS, INC. ZXP EISA/VESA Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2 Processor Speed 20/25/33/50(internal)/50/66(internal)MHz Chip Set SIS Max. Onboard DRAM256MB Cache 64/128/256/512KB BIOS AMI/Phoenix Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (3) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Reset switch J6 Turbo switch J22 Speaker J8 Turbo LED J24 Power LED & keylock J9 32-bit VESA local SL1 - SL3 bus slots USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select color J7 Closed Monitor type select monochrome J7 Open 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 2MB (1) 512K x NONE NONE NONE 36 4MB (1) 256K x (1) 256K x (1) 512K x NONE 36 36 36 4MB (1) 512K x NONE (1) 512K x NONE 36 36 4MB (1) 1M x 36 NONE NONE NONE 6MB (1) 512K x (1) 512K x (1) 256K x NONE 36 36 36 6MB (1) 512K x NONE (1) 1M x 36 NONE 36 8MB (1) 1M x 36 (1) 1M x 36 NONE NONE 8MB (1) 2M x 36 NONE NONE NONE 10MB (1) 256K x (1) 256K x (1) 1M x 36 (1) 1M x 36 36 36 10MB (1) 512K x NONE (1) 1M x 36 (1) 1M x 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) 2M x 36 NONE (1) 2M x 36 NONE 16MB (1) 4M x 36 NONE NONE NONE 18MB (1) 256K x (1) 256K x (1) 4M x 36 NONE 36 36 18MB (1) 512K x NONE (1) 4M x 36 NONE 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 34MB (1) 512K x NONE (1) 4M x 36 (1) 4M x 36 36 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 172MB (1) 16M x 36 (1) 16M x 36 (1) 16M x 36 NONE 256MB (1) 16M x 36 (1) 16M x 36 (1) 16M x 36 (1) 16M x 36 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 64KB (4) 8K x 8 (4) 8K x 8 (1) 64K x 1 128KB (4) 32K x 8 NONE (1) 64K x 1 256KB (4) 32K x 8 (4) 32K x 8 (1) 64K x 1 512KB (4) 128K x 8 NONE (1) 64K x 1 Note: The location of the TAG socket is unidentified. CACHE JUMPER CONFIGURATION Size JC1 JC2 JC3 JC4 JC5 JC6 JC7 JC9 64KB 1 & 2 1 & 2 1 & 2 1 & 2 1 & 2 1 & 2 1 & 2 2 & 3 128KB 2 & 3 2 & 3 1 & 2 1 & 2 1 & 2 1 & 2 2 & 3 1 & 2 256KB 2 & 3 2 & 3 2 & 3 1 & 2 1 & 2 2 & 3 2 & 3 4 & 5 512KB 2 & 3 2 & 3 2 & 3 2 & 3 2 & 3 2 & 3 2 & 3 1 & 2 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION Type J1 J2 J3 80486SX Closed pins 2 & 3 pins 2 & 3 closed closed ODP486SX Closed pins 1 & 2 pins 2 & 3 closed closed 80487SX Closed pins 1 & 2 pins 2 & 3 closed closed 80486DX/DX2 Open Open pins 1 & 2 closed CPU SPEED CONFIGURATION Speed JL2 JO1 JO2 JO3 JO4 20MHz Open Open Closed Closed Closed 25MHz Open Closed Open Closed Closed 33MHz Open Closed Closed Open Closed 50iMHz Open Closed Open Closed Closed 50MHz Closed Open Open Open Open 66iMHz Open Closed Closed Open Closed