SOYO COMPUTER CO., LTD. SY-25M/N/P Processor CX486S/80486SX/80486DX/AM486DX/80486DX2/CX486DX/ 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 Green PC connector JP4 Speaker J18 Green PC connector JP6 Reset switch J19 Green PC connector JP7 External battery J20 Green PC connector JP8 Turbo switch J21 32-bit VESA local bus SL1 – SL3 slots Turbo LED J22 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 2 & 3 closed alter » Factory configured - do not JP27 Pins 1 & 2 closed alter » Factory configured - do not JP34 Unidentified alter SIMM 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 (1) 512K x None None 36 36 4MB (1) 1M x 36 None None None 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) 256K x (1) 256K x (1) 1M x 36 None 36 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 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) 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 SIMM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 20MB (1) 512K x (1) 512K x (1) 4M x 36 None 36 36 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 24MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 None 32MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 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 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M 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 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 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 100iMHz Open Closed Closed CPU TYPE SELECTION Type JP1 JP2 JP11 JP12 JP14 CX 486S 1 & 2 2 & 3 2 & 3 1 & 2 2 & 3 80486SX 2 & 3 1 & 2 3 & 4 2 & 3 2 & 3 CX 486DX 1 & 2 2 & 3 2 & 3 1 & 2 1 & 2 80486DX 2 & 3 1 & 2 3 & 4 2 & 3 1 & 2 AM486DX 2 & 3 1 & 2 3 & 4 2 & 3 1 & 2 80486DX2 2 & 3 1 & 2 3 & 4 2 & 3 1 & 2 80486DX4 2 & 3 1 & 2 3 & 4 2 & 3 1 & 2 P24D 2 & 3 1 & 2 1 & 2, 3 2 & 3 1 & 2, 3 & 4 & 4 P24T 2 & 3 1 & 2 3 & 4 2 & 3 2 & 3 Note: Pins designated should be in the closed position. CPU TYPE SELECTION (CON’T) Type JP15 JP16 JP18 JP19 JP20 CX 486S Open Open 2 & 3 2 & 3 Open 80486SX Open Open 2 & 3 4 & 5 Open CX 486DX 3 & 4 Open 2 & 3 2 & 3 Open 80486DX 3 & 4 Open 2 & 3 4 & 5 Open AM486DX 3 & 4 Open 2 & 3 4 & 5 Open 80486DX2 3 & 4 Open 2 & 3 4 & 5 Open 80486DX4 3 & 4 Open 2 & 3 4 & 5 Open P24D 3 & 4 Closed 1 & 2 4 & 5 Open P24T 2 & 3 Open 1 & 2 1 & 2 Open Note: Pins designated should be in the closed position. CPU TYPE SELECTION (CON’T) Type JP21 JP22 JP23 JP32 CX 486S Open 2 & 3 2 & 3 1 & 2 80486SX 1 & 2 Open Open 1 & 2 CX 486DX Open 2 & 3 2 & 3 1 & 2 80486DX 1 & 2 Open Open 1 & 2 AM486DX 1 & 2 Open Open 1 & 2 80486DX2 1 & 2 Open Open 1 & 2 80486DX4 1 & 2 Open Open 1 & 2 P24D 2 & 3 1 & 2 Open 1 & 2 P24T Open 1 & 2 1 & 2 1 & 2 Note: Pins designated should be in the closed position. CPU VOLTAGE SELECTION Voltage JP24 3.3v Pins 3 & 5, 4 & 6 closed 5v Pins 1 & 3, 2 & 4 closed VL BUS WAIT STATE SELECTION Setting JP25 0 Pins 1 & 2 closed » 1 Pins 2 & 3 closed VL BUS SPEED SELECTION Speed JP26 <= 33MHz Pins 1 & 2 closed » >33 MHz Pins 2 & 3 closed