ACER, INC. V55-2 Device Type Mainboard Processor Pentium/Pentium MMX/ CX 6x86/AM K5/IBM 6x86 Processor Speed 75/90/100/120/133/150/166/200 MHz Chip Set Unidentified Maximum Onboard 128MB (EDO & SDRAM supported) Memory Cache 256/512KB BIOS Unidentified Dimensions 254mm x 218mm I/O Options (CPU) 32-bit ISA slots (3), 32-bit PCI slots (4), bus mouse port, PS/2 keyboard port, serial ports (2), parallel port [Image] CONNECTIONS Purpose Location Purpose Location Standby power CN1 Speaker CN16/pins 7 - connector 10 Serial port 2 CN2 Turbo LED CN16/pins 12 & 13 Serial port 1 CN3 Reset CN16/pins 19 & 20 Parallel port CN4 External suspend CN17 switch Floppy drive CN5 Software shutdown CN18 interface switch IDE interface 2 CN6 IrDA connector CN19 IDE interface 1 CN9 IDE interface LED CN20 CPU power CN13 PS/2 mouse port CN21 shorting block CPU fan connector CN14 32-bit PCI PC1-PC4 expansion slots Keylock CN16/pins 1 & Cache slot SL1 2 Power LED CN16/pins 3 - 5 USER CONFIGURABLE SETTINGS Function Label Position » ROM type select Flash ROM JP4 Pins 2 & 3 closed ROM type select EPROM JP4 Pins 1 & 2 closed » CPU core voltage select JP6 Pins 2 & 3 closed 2.8v CPU core voltage select JP6 Pins 1 & 2 closed 3.2v » CPU I/O voltage select 3.3v JP7 Pins 2 & 3 closed CPU I/O voltage select 3.5v JP7 Pins 1 & 2 closed » Factory configured - do not JP10 Pins 2 & 3 closed alter CMOS discharge normal JP11 Open CMOS discharge clear JP11 Closed ROM BRAND SELECTION Brand JP5 » 29EE010 Pins 2 & 3 closed NC Pins 1 & 2 closed 29F001 Pins 3 & 4 closed SIMM CONFIGURATION Size Bank 0 Bank 1 8MB (2) 1M x 32 None 16MB (2) 2M x 32 None 16MB (2) 1M x 32 (2) 1M x 32 24MB (2) 2M x 32 (2) 1M x 32 32MB (2) 4M x 32 None 32MB (2) 2M x 32 (2) 2M x 32 40MB (2) 4M x 32 (2) 1M x 32 48MB (2) 4M x 32 (2) 2M x 32 64MB (2) 8M x 32 None 64MB (2) 4M x 32 (2) 4M x 32 72MB (2) 8M x 32 (2) 1M x 32 80MB (2) 8M x 32 (2) 2M x 32 96MB (2) 8M x 32 (2) 4M x 32 128MB (2) 8M x 32 (2) 8M x 32 CACHE CONFIGURATION Size SL1 Tag Bank 0 256KB (2) 32K x 32 (8) 32K x 32 (2) 32K x 32 512KB (4) 32K x 32 (8) 32K x 32 (4) 32K x 32 512KB (2) 64K x 32 (8) 32K x 32 (2) 64K x 32 Note: The location of Tag SRAM is unidentified. CACHE JUMPER CONFIGURATION Size JP8 JP9 » 256KB Pins 2 & 3 closed Pins 2 & 3 closed 512KB Pins 1 & 2 closed Pins 1 & 2 closed CPU FREQUENCY SELECTION (INTEL) CPU Clock Clock SW1/1 SW1/2 SW1/3 SW1/4 Speed Ratio 75MHz 50MHz 1.5x Off Off On On 90MHz 60MHz 1.5x Off Off Off On 100MHz 66MHz 1.5x Off Off On Off 120MHz 60MHz 2x Off On Off On 133MHz 66MHz 2x Off On On Off 150MHz 60MHz 2.5x On On Off On 166MHz 66MHz 2.5x On On On Off CPU FREQUENCY SELECTION (INTEL MMX) CPU Clock Clock SW1/1 SW1/2 SW1/3 SW1/4 Speed Ratio 166MHz 66MHz 2.5x On On On Off 180MHz 60MHz 3x On Off Off On 200MHz 66MHz 3x On Off On Off CPU FREQUENCY SELECTION (AM K5) CPU Clock Clock SW1/1 SW1/2 SW1/3 SW1/4 Speed Ratio 75MHz 50MHz 1.5x Off Off On On 90MHz 60MHz 1.5x Off Off Off On 100MHz 66MHz 1.5x Off Off On Off 120MHz 60MHz 2x Off On Off On 133MHz 66MHz 2x Off On On Off 150MHz 60MHz 2.5x On On Off On 166MHz 66MHz 2.5x On On On Off CPU FREQUENCY SELECTION (CX 6X86) CPU Host Clock SW1/1 SW1/2 SW1/3 SW1/4 Bus Ratio 120MHz 50MHz 2x Off On On On 150MHz 60MHz 2x Off On Off On 166MHz 66MHz 2x Off On On Off CPU FREQUENCY SELECTION (IBM 6X86) CPU Host Clock SW1/1 SW1/2 SW1/3 SW1/4 Bus Ratio 120MHz 50MHz 2x Off On On On 150MHz 60MHz 2x Off On Off On 166MHz 66MHz 2x Off On On Off