SOYO COMPUTER CO., LTD. SY-25 J/K/L Processor CX486S/80486SX/CX486DX/AM486DX/SL80486DX/AM486DX2/ 80486DX2/AM486DX4/80486DX4/P24D/P24T Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz Speed Chip Set Unidentified Video Chip None Set Maximum 128MB (EDO supported) Onboard Memory Maximum None Video Memory Cache 64/128/256KB BIOS Award Dimensions 254mm x 218mm I/O 32-bit VESA local bus slots (3), green PC connector Options NPU None Options [Image] CONNECTIONS Purpose Location Purpose Location Power LED & keylock J17 Turbo LED J22 Speaker J18 Green PC connector JP4 Reset switch J19 Green PC connector JP6 External battery J20 Green PC connector JP7 Turbo switch J21 32-bit VESA local bus SL1 – SL3 slots USER CONFIGURABLE SETTINGS Function Label Position » Monitor type select monochrome JP3 Open Monitor type select JP3 Closed color/EGA/VGA » CMOS memory normal operation JP5 Pins 1 & 2 closed CMOS memory clear JP5 Pins 2 & 3 closed » Factory configured - do not JP17 Pins 1 & 2 closed alter » Factory configured - do not JP27 Pins 1 & 2 closed alter » Factory configured - do not JP32 Pins 1 & 2 closed alter » Factory configured - do not JP34 Unidentified alter SIMM CONFIGURATION 1 Size Bank 0 Bank 1 Bank 2 1MB (4) 256K x 9 None None 2MB (4) 256K x 9 (1) 256K x 36 None 4MB (4) 1M x 9 None None 5MB (4) 256K x 9 (1) 1M x 36 None 6MB (4) 256K x 9 (1) 256K x 36 (1) 1M x 36 8MB (4) 1M x 9 (1) 1M x 36 None 12MB (4) 1M x 9 (1) 1M x 36 (1) 1M x 36 16MB (4) 4M x 9 None None 17MB (4) 256K x 9 (1) 4M x 36 None 18MB (4) 256K x 9 (1) 256K x 36 (1) 4M x 36 20MB (4) 1M x 9 (1) 4M x 36 None 24MB (4) 1M x 9 (1) 1M x 36 (1) 4M x 36 32MB (4) 4M x 9 (1) 4M x 36 None 36MB (4) 1M x 9 (1) 4M x 36 (1) 4M x 36 48MB (4) 4M x 9 (1) 4M x 36 (1) 4M x 36 64MB (4) 16M x 9 None None 65MB (4) 256K x 9 (1) 16M x 36 None 68MB (4) 1M x 9 (1) 16M x 36 None 72MB (4) 1M x 9 (1) 1M x 36 (1) 16M x 36 80MB (4) 4M x 9 (1) 16M x 36 None 96MB (4) 4M x 9 (1) 4M x 36 (1) 16M x 36 128MB (4) 16M x 9 (1) 16M x 36 None SIMM CONFIGURATION 2 Size Bank 0 Bank 1 Bank 2 1MB None (1) 256K x 36 None 2MB None (1) 256K x 36 (1) 256K x 36 2MB None (1) 512K x 36 None 4MB None (1) 512K x 36 (1) 512K x 36 4MB None (1) 1M x 36 None 5MB None (1) 256K x 36 (1) 1M x 36 6MB (4) 1M x 9 (1) 256K x 36 (1) 256K x 36 6MB None (1) 512K x 36 (1) 1M x 36 8MB None (1) 1M x 36 (1) 1M x 36 8MB None (1) 2M x 36 None 12MB (4) 1M x 9 (1) 1M x 36 (1) 1M x 36 12MB None (1) 1M x 36 (1) 2M x 36 16MB None (1) 2M x 36 (1) 2M x 36 16MB None (1) 4M x 36 None 17MB None (1) 256K x 36 (1) 4M x 36 18MB (4) 4M x 9 (1) 256K x 36 (1) 256K x 36 18MB None (1) 512K x 36 (1) 4M x 36 20MB None (1) 1M x 36 (1) 4M x 36 24MB (4) 4M x 9 (1) 1M x 36 (1) 1M x 36 32MB None (1) 4M x 36 (1) 4M x 36 32MB None (1) 8M x 36 None 36MB (4) 4M x 9 (1) 1M x 36 (1) 4M x 36 36MB None (1) 1M x 36 (1) 8M x 36 48MB (4) 4M x 9 (1) 4M x 36 (1) 4M x 36 48MB None (1) 4M x 36 (1) 8M x 36 64MB None (1) 8M x 36 (1) 8M x 36 65MB None (1) 256K x 36 (1) 16M x 36 68MB None (1) 1M x 36 (1) 16M x 36 72MB (4) 16M x 9 (1) 1M x 36 (1) 1M x 36 80MB None (1) 4M x 36 (1) 16M x 36 96MB (4) 16M x 9 (1) 4M x 36 (1) 4M x 36 128MB None (1) 16M x 36 (1) 16M x 36 Note: Board also accepts x 32 SIMMs. SIMM JUMPER CONFIGURATION Configuration JP35 JP36 JP37 1 Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed 2 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed 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 (A) (4) 32K x 8 (4) 32K x 8 (1) 16K/32K x 8 256KB (B) (4) 64K x 8 None (1) 16K/32K x 8 CACHE JUMPER CONFIGURATION Size JP9 JP10 JP13 64KB Pins 2 & 3 Open Pins 1 & 2 closed closed 128KB Pins 2 & 3 Pins 1 & 2 Pins 2 & 3 closed closed closed 256KB (A) Pins 1 & 2 Pins 2 & 3 Pins 2 & 3 closed closed closed 256KB (B) Pins 1 & 2 Pins 2 & 3 Pins 2 & 3 closed closed closed CPU SPEED SELECTION Speed JP29 JP30 JP31 25MHz Closed Open Closed 33MHz Open Closed Closed 40MHz Closed Open Open 50iMHz Closed Open Closed 50MHz Open Closed Open 66iMHz Open Closed Closed 75iMHz Closed Open Closed 80iMHz Closed Open Open 100iMHz Open Closed Closed CPU TYPE SELECTION Type JP1 JP2 JP11 JP12 JP14 CX 486S 1 & 2 2 & 3 2 & 3 1 & 2 1 & 2 80486SX 2 & 3 1 & 2 3 & 4 2 & 3 2 & 3 CX 486DX 1 & 2 2 & 3 2 & 3 1 & 2 1 & 2 AM486DX 2 & 3 1 & 2 3 & 4 2 & 3 3 & 4 SL80486DX 2 & 3 1 & 2 3 & 4 2 & 3 3 & 4 AM486DX2 2 & 3 1 & 2 3 & 4 2 & 3 3 & 4 80486DX2 2 & 3 1 & 2 3 & 4 2 & 3 3 & 4 AM486DX4 2 & 3 1 & 2 3 & 4 2 & 3 3 & 4 80486DX4 2 & 3 1 & 2 3 & 4 2 & 3 3 & 4 80486DX4 (ODP) 2 & 3 1 & 2 3 & 4 2 & 3 3 & 4 P24D 1 & 2 1 & 2 1 & 2, 3 2 & 3 1 & 2, 3 & 4 & 4 P24T 2 & 3 1 & 2 3 & 4 2 & 3 3 & 4 Note: Pins designated should be in the closed position. CPU TYPE SELECTION (CON’T) Type JP15 JP16 JP18 JP19 CX 486S 2 & 3 Open 2 & 3 2 & 3 80486SX Open Open 2 & 3 4 & 5 CX 486DX 2 & 3 Open 2 & 3 2 & 3 AM486DX 2 & 3 Open 2 & 3 4 & 5 SL80486DX 2 & 3 Open 2 & 3 4 & 5 AM486DX2 2 & 3 Open 2 & 3 4 & 5 80486DX2 2 & 3 Open 2 & 3 4 & 5 AM486DX4 2 & 3 Open 2 & 3 4 & 5 80486DX4 2 & 3 Open 2 & 3 4 & 5 80486DX4 (ODP) 2 & 3 Open 2 & 3 4 & 5 P24D 2 & 3 Closed 1 & 2 4 & 5 P24T 1 & 2 Open 2 & 3 1 & 2 Note: Pins designated should be in the closed position. CPU TYPE SELECTION (CON’T) Type JP20 JP21 JP22 JP23 CX 486S Open Open 2 & 3 2 & 3 80486SX Open 1 & 2 Open Open CX 486DX Open Open 2 & 3 2 & 3 AM486DX Open 1 & 2 Open Open SL80486DX Open 1 & 2 Open Open AM486DX2 2 & 3 1 & 2 Open Open 80486DX2 Open 1 & 2 Open Open AM486DX4 1 & 2 1 & 2 Open Open 80486DX4 Open 1 & 2 Open Open 80486DX4 (ODP) Open 1 & 2 Open Open P24D 1 & 2 2 & 3 1 & 2 Open P24T Open Open 1 & 2 1 & 2 Note: Pins designated should be in the closed position. CPU VOLTAGE SELECTION Voltage JP24 3.45v Pins 3 & 5, 4 & 6 closed 5v Pins 1 & 3, 2 & 4 closed