AAEON TECHNOLOGY, INC. SBC-490 Device Type Mainboard Processor 80486SX/SL80486SX/80486DX/SL80486DX/CX486DX2/SGS486DX2/ TI486DX2/ IBM486DX2/AM486DX2/80486DX2/SL80486DX2/AM486DX4/(SL)AM486DX4/ SL80486DX4/ P24D/CXMISC/CX 5X86/IBM 5X86/SGS 5X86/AM X5 Processor Speed 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz Chip Set ALI 1489 Video Chip Set Trident Maximum Onboard Memory 128MB (EDO supported) Maximum Video Memory 2MB Cache 128/256/512KB BIOS Award Dimensions 338mm x 122mm I/O Options Floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port, IR connector, PC/104connectors (2) [Image] CONNECTIONS Purpose Location Purpose Location Power LED & keylock C1 Auxiliary keyboard CN5 connector Speaker C2 PC/104 connector CN6 Reset switch C3 PC/104 connector CN7 Green PC connector C4 IDE interface 2 CN8 Green PC connector C5 IDE interface 1 CN9 Turbo LED C6 Floppy drive CN10 interface Turbo switch C7 Parallel port CN11 CPU fan power C8 VGA feature CN12 connector Power connector CN1 Serial port 2 CN13 Serial port 1 CN2 IDE interface LED JP2 VGA port CN3 IDE interface LED JP3 PS/2 mouse port CN4 IR connector JP17 USER CONFIGURABLE SETTINGS Function Label Position Flash BIOS write protect enabled JP11 Closed Flash BIOS write protect disabled JP11 Open » CMOS memory normal operation JP15 Open CMOS memory clear JP15 Closed 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 3MB (1) 256K x (1) 256K x (1) 256K x None 36 36 36 4MB (1) 1M x 36 None None None 4MB (1) 256K x (1) 256K x (1) 256K x (1) 256K x 36 36 36 36 5MB (1) 1M x 36 (1) 256K x None None 36 6MB (1) 1M x 36 (1) 256K x (1) 256K x None 36 36 7MB (1) 1M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 8MB (1) 2M x 36 None None None 8MB (1) 1M x 36 (1) 1M x 36 None None 9MB (1) 2M x 36 (1) 256K x None None 36 10MB (1) 2M x 36 (1) 256K x (1) 256K x None 36 36 11MB (1) 2M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 12MB (1) 2M x 36 (1) 1M x 36 None None 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) 4M x 36 None None None 16MB (1) 2M x 36 (1) 1M x 36 (1) 1M x 36 None 16MB (1) 2M 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 SIMM CONFIGURATION (CON'T) Size Bank 0 Bank 1 Bank 2 Bank 3 17MB (1) 4M x 36 (1) 256K x None None 36 18MB (1) 4M x 36 (1) 256K x (1) 256K x None 36 36 20MB (1) 4M x 36 (1) 1M x 36 None None 20MB (1) 2M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 24MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 None 32MB (1) 8M x 36 None None None 32MB (1) 4M x 36 (1) 2M x 36 (1) 2M x 36 None 32MB (1) 4M x 36 (1) 4M x 36 None None 34MB (1) 8M x 36 (1) 512K x None None 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) 8M x 36 (1) 1M x 36 (1) 1M x 36 None 40MB (1) 8M x 36 (1) 2M x 36 None None 40MB (1) 4M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 48MB (1) 8M x 36 (1) 4M x 36 None None 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 None 56MB (1) 8M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 64MB (1) 8M x 36 (1) 4M x 36 (1) 4M x 36 None 64MB (1) 8M 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 80MB (1) 8M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 96MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 None 128MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 CACHE CONFIGURATION Size Bank 0 TAG 128KB (4) 32K x 8 (1) 32K x 8 256KB (4) 64K x 8 (1) 32K x 8 512KB (4) 128K x (1) 32K x 8 8 CACHE JUMPER CONFIGURATION Size JP12 128KB Open 256KB Pins 1 & 2 closed 512KB Pins 1 & 2, 3 & 4 closed VIDEO MEMORY CONFIGURATION Size Bank 0 Bank 1 1MB (2) 256K x None 16 2MB (2) 256K x (2) 256K x 16 16 CPU SPEED SELECTION Speed JP13 JP14 25MHz Open Pins 1 & 2 closed 33MHz Pins 1 & 2, 3 & 4 Pins 1 & 2 closed closed 40MHz Pins 3 & 4, 5 & 6 Pins 2 & 3 closed closed 50iMHz Open Pins 1 & 2 closed 50MHz Pins 1 & 2, 5 & 6 Pins 2 & 3 closed closed 66iMHz Pins 1 & 2, 3 & 4 Pins 1 & 2 closed closed 75iMHz Open Pins 1 & 2 closed 100iMHz Pins 1 & 2, 3 & 4 Pins 1 & 2 closed closed CPU TYPE SELECTION Type JP8 80486SX 1 & 2, 19 & 20, 23 & 24, 25 & 26 SL80486SX 1 & 4, 2 & 5, 7 & 10, 8 & 9, 14 & 17, 15 & 18, 19 & 20, 22 & 23, 26 & 27 80486DX 1 & 2, 18 & 21, 19 & 20, 22 & 23, 25 & 26 CX486DX2 1 & 4, 2 & 3, 5 & 8, 7 & 10, 11 & 14, 18 & 21, 22 & 23, 25 & 26 SGS486DX2 1 & 4, 2 & 3, 5 & 8, 7 & 10, 11 & 14, 18 & 21, 22 & 23, 25 & 26 TI486DX2 1 & 4, 2 & 3, 5 & 8, 7 & 10, 11 & 14, 18 & 21, 22 & 23, 25 & 26 IBM486DX2 1 & 4, 2 & 3, 5 & 8, 7 & 10, 11 & 14, 18 & 21, 22 & 23, 25 & 26 80486DX2 1 & 2, 18 & 21, 19 & 20, 22 & 23, 25 & 26 AM486DX4 1 & 2, 3 & 6, 13 & 16, 18 & 21, 19 & 20, 22 & 23, 25 & 26 (SL)AM486DX4 1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & 21, 19 & 20, 22 & 23, 26 & 27 P24D 1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & 21, 19 & 20, 22 & 23, 26 & 27 P24T 1 & 4, 2 & 5, 7 & 10, 8 & 9, 14 & 17, 15 & 18, 19 & 20, 22 & 23, 26 & 27 CX 5X86 1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & 21, 19 & 20, 22 & 23, 25 & 26 IBM 5X86 1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & 21, 19 & 20, 22 & 23, 25 & 26 SGS 5X86 1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & 21, 19 & 20, 22 & 23, 25 & 26 CX MISC 1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & 21, 19 & 20, 23 & 24, 25 & 26 AM X5-133/150 1 & 4, 2 & 5, 8 & 9, 10 & 11, 13, & 16, 14 & 17, 18 & 21, 19 & 20, 22 & 23, 26 & 27 AM X5-160 1 & 2, 18 & 21, 19 & 20, 22 & 23, 25 & 26 AM DE2 1 & 2, 18 & 21, 19 & 20, 22 & 23, 25 & 26 Note: Pins designated should be in the closed position. CPU VOLTAGE SELECTION Voltage JP1 JP7 3.3v Pins 1 & 3, 2 & 4 Pins 1 & 3 closed closed 3.45v Pins 1 & 3, 2 & 4 Pins 4 & 6 closed closed 3.6v Pins 1 & 3, 2 & 4 Pins 3 & 5 closed closed 4v Pins 3 & 5, 4 & 6 Open closed 5v Pins 1 & 3, 2 & 4 Pins 2 & 4 closed closed SERIAL PORT 1 INTERRUPT SELECTION Serial port 1 Serial port 2 JP18 IRQ3 IRQ4 Pins 1 & 2, 3 & 4 closed IRQ4 IRQ3 Pins 1 & 3, 2 & 4 closed IRQ11 IRQ10 Pins 5 & 7, 6 & 8 closed IRQ10 IRQ11 Pins 5 & 6, 7 & 8 closed IRQ4 IRQ10 Pins 1 & 3, 7 & 8 closed IRQ4 IRQ11 Pins 1 & 3, 6 & 8 closed IRQ3 IRQ10 Pins 1 & 2, 7 & 8 closed IRQ3 IRQ11 Pins 1 & 2, 5 & 7 closed IRQ11 IRQ3 Pins 2 & 4, 5 & 6 closed IRQ11 IRQ4 Pins 3 & 4, 5 & 6 closed IRQ10 IRQ3 Pins 2 & 4, 5 & 7 closed IRQ10 IRQ4 Pins 3 & 4, 5 & 7 closed ON BOARD VGA SELECTION Setting JP4 JP5 JP6 Enabled Closed Closed Closed Disabled Open Open Open WATCHDOG TIMER SELECTION Setting JP16 Disabled Open Reset Pins 5 & 6 closed IRQ15 Pins 3 & 4 closed NMI Pins 1 & 2 closed