SOYO COMPUTER CO., LTD. SY-25 T Processor UMCU5S/AM486SX/80486SX/CX486DX/AM486DX/AM486DXL/ 80486DX/SL80486DX/CX486DX2/AM486DX2/80486DX2/ SL80486DX2/AM486DX4/SL80486DX4/P24D/P24T Processor 25/33/40/50(internal)/66(internal)/75(internal)/80(internal)/ Speed 100(internal)MHz Chip Set Unidentified Video Chip None Set Maximum 128MB Onboard Memory Maximum None Video Memory Cache 256KB BIOS Award Dimensions 254mm x 218mm I/O Options 32-bit VESA local bus slots (3), green PC connector NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Power LED & keylock J17 Turbo switch J21 Speaker J18 Turbo LED J22 Reset switch J19 Green PC connector JP25 External battery J20 32-bit VESA local bus SL1 – SL3 slots USER CONFIGURABLE SETTINGS Function Label Position » CMOS memory normal operation J20 Pins 2 & 3 closed CMOS memory clear J20 Pins 3 & 4 closed Battery type select external J20 Closed SIMM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (1) 256K x None None None 36 2MB (1) 512K x None None None 36 2MB (1) 256K x (1) 256K x None None 36 36 4MB (1) 1M x 36 None None None 4MB (1) 256K x (1) 256K x (1) 512K x None 36 36 36 4MB (1) 512K x (1) 512K x None None 36 36 5MB (1) 256K x (1) 1M x 36 None None 36 6MB (1) 256K x (1) 256K x (1) 1M x 36 None 36 36 6MB (1) 512K x (1) 1M x 36 None None 36 8MB (1) 256K x (1) 256K x (1) 512K x (1) 1M x 36 36 36 36 8MB (1) 512K x (1) 512K x (1) 1M x 36 None 36 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 12MB (1) 512K x (1) 512K 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 12MB (1) 1M x 36 (1) 2M x 36 None None 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 16MB (1) 2M x 36 (1) 2M x 36 None None 16MB (1) 1M x 36 (1) 1M x 36 (1) 2M x 36 None 16MB (1) 4M x 36 None None None 17MB (1) 256K x (1) 4M x 36 None None 36 18MB (1) 256K x (1) 256K x (1) 4M x 36 None 36 36 18MB (1) 512K x (1) 4M x 36 None None 36 20MB (1) 512K x (1) 512K x (1) 4M x 36 None 36 36 20MB (1) 1M x 36 (1) 2M x 36 (1) 2M x 36 None 20MB (1) 1M x 36 (1) 4M x 36 None None 24MB (1) 512K x (1) 512K x (1) 1M x 36 (1) 4M x 36 36 36 24MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 None SIMM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 24MB (1) 1M x 36 (1) 1M x 36 (1) 2M x 36 (1) 2M x 36 24MB (1) 2M x 36 (1) 4M x 36 None None 24MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 None 28MB (1) 1M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 32MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 32MB (1) 2M x 36 (1) 2M x 36 (1) 4M x 36 None 32MB (1) 4M x 36 (1) 4M x 36 None None 32MB (1) 8M x 36 None None None 36MB (1) 512K x (1) 512K x (1) 4M x 36 (1) 4M x 36 36 36 36MB (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 None 36MB (1) 1M x 36 (1) 8M x 36 None None 40MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 40MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 (1) 4M x 36 40MB (1) 1M x 36 (1) 1M x 36 (1) 8M x 36 None 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 None 48MB (1) 2M x 36 (1) 2M x 36 (1) 4M x 36 (1) 4M x 36 48MB (1) 2M x 36 (1) 2M x 36 (1) 8M x 36 None 48MB (1) 4M x 36 (1) 8M x 36 None None 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 64MB (1) 4M x 36 (1) 4M x 36 (1) 8M x 36 None 64MB (1) 16M x 36 None None None 64MB (1) 8M x 36 (1) 8M x 36 None None 65MB (1) 256K x (1) 16M x 36 None None 36 68MB (1) 1M x 36 (1) 16M x 36 None None 68MB (1) 1M x 36 (1) 8M x 36 (1) 8M x 36 None 72MB (1) 1M x 36 (1) 1M x 36 (1) 16M x None 36 72MB (1) 1M x 36 (1) 1M x 36 (1) 8M x 36 (1) 8M x 36 80MB (1) 4M x 36 (1) 16M x 36 None None 80MB (1) 4M x 36 (1) 8M x 36 (1) 8M x 36 None 80MB (1) 2M x 36 (1) 2M x 36 (1) 8M x 36 (1) 8M x 36 96MB (1) 4M x 36 (1) 4M x 36 (1) 16M x None 36 96MB (1) 4M x 36 (1) 4M x 36 (1) 8M x 36 (1) 8M x 36 96MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 None 128MB (1) 16M x 36 (1) 16M x 36 None None 128MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 Note: Board also accepts x 32 SIMMs. Do not use any other combination of SIMM configuration. CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 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 256KB (A) Pins 2 & 3 closed Pins 2 & 3 closed 256KB (B) Pins 1 & 2, 3 & 4 Pins 1 & 2 closed closed CPU SPEED SELECTION Speed JP4 JP5 JP6 25MHz Open Open Closed 33MHz Closed Closed Closed 40MHz Open Closed Closed 50iMHz Open Open Closed 66iMHz Closed Closed Closed 75iMHz Open Open Closed 80iMHz Open Closed Closed 100iMHz Closed Closed Closed CPU TYPE SELECTION Type JP11 JP12 JP13 JP14 JP15 UMC U5S 2 & 3 2 & 3 2 & 3 2 & 3 2 & 3 AM486SX Open 2 & 3 2 & 3 2 & 3 2 & 3 80486SX Open 2 & 3 2 & 3 2 & 3 2 & 3 CX486DX (5v) 1 & 2, 1 & 2, 3 1 & 2, 2 & 3 2 & 3 3 & 4 & 4, 5 & 3 & 4 6 AM486DX Open 2 & 3 1 & 2, 2 & 3 2 & 3 3 & 4 AM486DXL (5v) 2 & 3 2 & 3 1 & 2, 2 & 3 2 & 3 3 & 4 80486DX Open 2 & 3 1 & 2, 2 & 3 2 & 3 3 & 4 SL80486DX 1 & 2 1 & 2 1 & 2, 2 & 3 2 & 3 3 & 4 CX486DX2 (5v) 1 & 2, 1 & 2, 3 1 & 2, 2 & 3 2 & 3 3 & 4 & 4, 5 & 3 & 4 6 CX486DX2-66 1 & 2, 1 & 2, 3 1 & 2, 1 & 2 1 & 2 (3.6v) 3 & 4 & 4, 5 & 3 & 4 6 CX486DX2-80 (4v) 1 & 2, 1 & 2, 3 1 & 2, 1 & 2 1 & 2 3 & 4 & 4, 5 & 3 & 4 6 AM486DX2 Open 2 & 3 1 & 2, 2 & 3 2 & 3 3 & 4 AM486DX2-80 Open 2 & 3 1 & 2, 1 & 2 1 & 2 (3.45v) 3 & 4 AM486DXL2 (5v) 2 & 3 2 & 3 1 & 2, 2 & 3 2 & 3 3 & 4 80486DX2 Open 2 & 3 1 & 2, 2 & 3 2 & 3 3 & 4 SL80486DX2 1 & 2 1 & 2 1 & 2, 2 & 3 2 & 3 3 & 4 AM486DX4 (3.45v) Open 2 & 3 1 & 2, 1 & 2 1 & 2 3 & 4 SL80486DX4 1 & 2 1 & 2 1 & 2, 1 & 2 1 & 2 (3.45v) 3 & 4 SL80486DX4 (5v) 1 & 2 1 & 2 1 & 2, 2 & 3 2 & 3 3 & 4 P24D 1 & 2, 1 & 2, 4 1 & 2, 2 & 3 2 & 3 4 & 5 & 5 3 & 4 P24T 1 & 2 1 & 2 1 & 2, 2 & 3 2 & 3 3 & 4 Note: Pins designated should be in the closed position. CPU TYPE SELECTION (CON’T) Type JP16 JP17 JP18 JP19 UMC U5S 2 & 3 3 & 4 1 & 2 Open AM486SX 2 & 3 Open Open Open 80486SX 2 & 3 Open Open Open CX486DX (5v) 2 & 3 1 & 2 2 & 3, 4 & 2 & 3 5 AM486DX 2 & 3 1 & 2 Open Open AM486DXL (5v) 2 & 3 1 & 2, 3 & 1 & 2 Open 4 80486DX 2 & 3 1 & 2 Open Open SL80486DX 2 & 3 1 & 2 5 & 6 1 & 2, 3 & 4 CX486DX2 (5v) 2 & 3 1 & 2 2 & 3, 4 & 2 & 3 5 CX486DX2-66 (3.6v) 1 & 2 1 & 2 2 & 3, 4 & 2 & 3 5 CX486DX2-80 (4v) 1 & 2 1 & 2 2 & 3, 4 & 2 & 3 5 AM486DX2 2 & 3 1 & 2 Open Open AM486DX2-80 1 & 2 1 & 2 Open Open (3.45v) AM486DXL2 (5v) 2 & 3 1 & 2, 3 & 1 & 2 Open 4 80486DX2 2 & 3 1 & 2 Open Open SL80486DX2 2 & 3 1 & 2 5 & 6 1 & 2, 3 & 4 AM486DX4 (3.45v) 1 & 2 1 & 2 Open Open SL80486DX4 (3.45v) 1 & 2 1 & 2 5 & 6 1 & 2, 3 & 4 SL80486DX4 (5v) 2 & 3 1 & 2 5 & 6 1 & 2, 3 & 4 P24D 2 & 3 1 & 2 3 & 4, 5 & 1 & 2, 3 & 6 4 P24T 2 & 3 2 & 3 5 & 6 1 & 2, 3 & 4 Note: Pins designated should be in the closed position. CPU TYPE SELECTION Type JP20 JP26 JP27 UMC U5S Open Open Open AM486SX Open Open Open 80486SX Open Open Open CX486DX (5v) Open Open Open AM486DX Open Open Open AM486DXL (5v) Open Open Open 80486DX Open Open Open SL80486DX Open Open Open CX486DX2 (5v) Open Open Open CX486DX2-66 (3.6v) Open Open Pins 3 & 4 closed CX486DX2-80 (4v) Open Open Pins 5 & 6 closed AM486DX2 Open Open Open AM486DX2-80 (3.45v) Open Closed Pins 1 & 2 closed AM486DXL2 (5v) Open Open Open 80486DX2 Open Open Open SL80486DX2 Open Open Open AM486DX4 (3.45v) Open Open Pins 1 & 2 closed SL80486DX4 (3.45v) Open Open Pins 1 & 2 closed SL80486DX4 (5v) Open Open Open P24D Open Open Open P24T Open Open Open Note: Pins designated should be in the closed position.