ACER, INC. AP55CS Device Type Mainboard Processor CX 6X86/Pentium Processor Speed 75/90/100/120/133/150/166MHz Chip Set SIS Video Chip Set Unidentified Maximum Onboard 128MB (EDO supported) Unified Memory Architecture Memory (UMA) Cache 256KB BIOS AMI Dimensions 280mm x 220mm I/O Options 32-bit PCI slots (3), floppy drive interface, IDE interfaces (2), parallel port, serial ports (2), VGA feature connector, VGA port, VRM connector NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Serial port 1 CN1 IDE interface LED JP16 Serial port 2 CN2 Power LED & JP24/pins 1 – 5 keylock Floppy drive CN3 Speaker JP24/pins 7 – interface 10 Parallel port CN4 Turbo LED JP24/pins 12 & 13 IDE interface 2 CN5 Turbo switch JP24/pins 15 – 17 IDE interface 1 CN6 Reset switch JP24/pins 19 & 20 VGA feature CN7 32-bit PCI slots PC1 – PC3 connector VGA port J3 VRM connector VRM CPU fan power J7 USER CONFIGURABLE SETTINGS Function Label Position » Factory configured - do not JP2 Unidentified alter » Factory configured - do not JP3 Unidentified alter » Factory configured - do not JP5 Unidentified alter » Factory configured - do not JP8 Unidentified alter » Factory configured - do not JP13 Unidentified alter On board I/O enabled JP14 Pins 1 & 2 closed On board I/O disabled JP14 Pins 2 & 3 closed » Factory configured - do not JP17 Unidentified alter » CMOS memory normal operation JP19 Pins 1 & 2 closed CMOS memory clear JP19 Pins 2 & 3 closed SIMM CONFIGURATION Size Bank 0 Bank 1 2MB (2) 256K x 36 None 4MB (2) 512K x 36 None 4MB (2) 256K x 36 (2) 256K x 36 6MB (2) 512K x 36 (2) 256K x 36 8MB (2) 512K x 36 (2) 512K x 36 8MB (2) 1M x 36 None 10MB (2) 1M x 36 (2) 256K x 36 12MB (2) 1M x 36 (2) 512K x 36 16MB (2) 2M x 36 None 16MB (2) 1M x 36 (2) 1M x 36 18MB (2) 2M x 36 (2) 256K x 36 SIMM CONFIGURATION (CON’T) Size Bank 0 Bank 1 20MB (2) 2M x 36 (2) 512K x 36 24MB (2) 2M x 36 (2) 1M x 36 32MB (2) 4M x 36 None 32MB (2) 2M x 36 (2) 2M x 36 34MB (2) 4M x 36 (2) 256K x 36 36MB (2) 4M x 36 (2) 512K x 36 40MB (2) 4M x 36 (2) 1M x 36 48MB (2) 4M x 36 (2) 2M x 36 64MB (2) 8M x 36 None 64MB (2) 4M x 36 (2) 4M x 36 66MB (2) 8M x 36 (2) 256K x 36 68MB (2) 8M x 36 (2) 512K x 36 72MB (2) 8M x 36 (2) 1M x 36 80MB (2) 8M x 36 (2) 2M x 36 96MB (2) 8M x 36 (2) 4M x 36 128MB (2) 8M x 36 (2) 8M x 36 Note: Board accepts EDO memory. CACHE CONFIGURATION Size Bank 0 256KB (2) 32K x 32 CACHE TYPE CONFIGURATION Type JP1 Linear mode Pins 1 & 2 closed Interleave mode Pins 2 & 3 closed CPU SPEED SELECTION (CX 6X86) CPU Clock Multiplier JP9 JP10 JP22 JP23 speed speed 120MHz 50MHz 2x 2 & 3 2 & 3 Open Open 150MHz 60MHz 2x 2 & 3 1 & 2 Open Open 166MHz 66MHz 2x 1 & 2 2 & 3 Open Open Note: Pins designated should be in the closed position. CPU SPEED SELECTION (INTEL) CPU Clock Multiplier JP9 JP10 JP22 JP23 speed speed 75MHz 50MHz 1.5x 2 & 3 2 & 3 2 & 3 2 & 3 90MHz 60MHz 1.5x 2 & 3 1 & 2 2 & 3 2 & 3 100MHz 66MHz 1.5x 1 & 2 2 & 3 2 & 3 2 & 3 120MHz 60MHz 2x 2 & 3 1 & 2 1 & 2 2 & 3 133MHz 66MHz 2x 1 & 2 2 & 3 1 & 2 2 & 3 150MHz 60MHz 2.5x 2 & 3 1 & 2 1 & 2 1 & 2 166MHz 66MHz 2.5x 1 & 2 2 & 3 1 & 2 1 & 2 Note: Pins designated should be in the closed position. DMA CHANNEL SELECTION Channel JP11 JP12 1 Pins 2 & 3 closed Pins 2 & 3 closed 3 Pins 1 & 2 closed Pins 1 & 2 closed ON BOARD VIDEO SELECTION Setting JP4 JP6 JP7 Enabled Closed Pins 1 & 2 Pins 2 & 3 closed closed Disabled Open Pins 2 & 3 Pins 3 & 4 closed closed FLASH BIOS SELECTION Setting JP18 5v Pins 2 & 3, 5 & 6 closed 12v Pins 1 & 2, 5 & 6 closed EEPROM Pins 2 & 3, 4 & 5 closed