GIGA-BYTE TECHNOLOGY CO., LTD. GA-486TA Processor 80486SX/80486DX/80486DX2/Pentium Overdrive Processor Speed 25/33/40(internal)/50(internal)/50/66(internal)MHz Chip Set OPTI Max. Onboard DRAM128MB Cache 64/128/256/512KB 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 Power LED & keylock J1 Turbo switch J4 Reset switch J2 Turbo LED J5 Speaker J3 32-bit VESA Local SL1 & SL2 bus slots USER CONFIGURABLE SETTINGS Function Jumper Position » CPU type select 80486DX/P24T J6 pins 1 & 2 closed CPU type select 80486SX J6 pins 2 & 3 closed » Monitor type select color J14 Closed Monitor type select monochrome J14 Open » CMOS memory normal operation J17 Open CMOS memory clear J17 Closed » Factory configured - do not alter J18 pins 2 & 3 closed » Factory configured - do not alter J23 pins 2 & 3 closed 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 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 32MB (4) 4M x 9 (4) 4M x 9 64MB (4) 16M x 9 NONE 128MB (4) 16M x 9 (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) 32K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 512KB (1) 128K x 8 NONE (1) 32K x 8 CACHE JUMPER CONFIGURATION Size J8 J9 J10 J11 64KB Open Open Open N/A 128KB Open Closed Open pins 1 & 2 closed 256KB Open Closed Closed pins 2 & 3 closed 512KB Closed Closed Closed pins 1 & 2 closed CPU SPEED CONFIGURATION Speed JC0 JC1 JC2 25MHz pins 2 & 3 pins 1 & 2 pins 1 & 2 closed closed closed 33MHz pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed 40MHz pins 2 & 3 pins 2 & 3 pins 1 & 2 closed closed closed 50iMHz pins 2 & 3 pins 1 & 2 pins 1 & 2 closed closed closed 50MHz pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed 66iMHz pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed VESA WAIT STATE/BUS SPEEDCONFIGURATION CPU speed Wait states J31 J32 £ 33MHz 0 wait states Open Open > 33MHz 1 wait state Closed Closed