CHICONY, INC. CH-491E Processor CX486S/80486SDX/CX487S/80487SX/CX486DX/AM486DX/80486DX/ CX486DX2/AM486DX2/80486DX2/Pentium Overdrive Processor 20/25/33/40/50(internal)/50/66(internal)MHz Speed Chip Set Advanced Max. Onboard 64MB DRAM Cache 32/64/128/256KB BIOS AMI Dimensions 220mm x 250mm I/O Options 32-bit VESA local bus slots (3) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location External battery J3 Speaker J7 Reset switch J4 Power LED & keylock J8 Turbo switch J5 32-bit VESA local bus SL1 - SL3 slots Turbo LED J6 USER CONFIGURABLE SETTINGS Function Jumper Position » CMOS memory normal operation JP1 Open CMOS memory clear JP1 Closed Address strobe delay disabled JP7 pins 1 & 2 closed Address strobe delay enabled JP7 pins 2 & 3 closed » PQFP CPU enabled JP12 Open PQFP CPU disabled JP12 Closed » VGA card select normal card JP19 pins 1 & 2 installed closed VGA card select Weitek Power JP19 pins 2 & 3 9000 card installed 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 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 32KB (4) 8K x 8 NONE (1) 8K x 8 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) 16K x 8 or (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP2 JP3 JP4 JP5 JP6 32KB 2 & 3 2 & 3 Open Open Open 64KB 1 & 2 1 & 2 Open Open Closed 128KB 2 & 3 2 & 3 Open Closed Closed 256KB 1 & 2 1 & 2 Closed Closed Closed Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION Type JP15 JP16 JP17 JP18 JP20 CX486S 2 & 3 Open Open 2 & 3 2 & 3 80486SX 2 & 3 Open Open 2 & 3 2 & 3 CX487S 1 & 2, 3 1 & 2 Open 1 & 2 1 & 2 & 4 80487SX 1 & 2, 3 2 & 3 Open 2 & 3 2 & 3 & 4 CX486DX 1 & 2, 3 1 & 2 Open 2 & 3 2 & 3 & 4 AM80486DX 1 & 2, 3 1 & 2 Open 2 & 3 2 & 3 & 4 80486DX 1 & 2, 3 1 & 2 Open 2 & 3 2 & 3 & 4 CX486DX2 1 & 2, 3 1 & 2 Closed 2 & 3 2 & 3 & 4 AM486DX2 1 & 2, 3 1 & 2 Open 2 & 3 2 & 3 & 4 80486DX2 1 & 2, 3 1 & 2 Open 2 & 3 2 & 3 & 4 P24T 1 & 2, 3 1 & 2 Open 2 & 3 2 & 3 & 4 Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION Speed JP8 JP9 JP10 JP11 20Mhz Closed Closed Closed Closed 25MHz Open Open Closed Closed 33MHz Open Open Closed Open 40MHz Open Open Open Closed 50iMHz Open Open Closed Closed 50MHz Open Open Open Open 66iMHz Open Open Closed Open VL BUS WAIT STATE CONFIGURATION Wait states JP13 0 wait states Open 1 wait state Closed VL BUS SPEED CONFIGURATION CPU speed JP14 <= 33MHz Open > 33MHz Closed