VTECH INDUSTRIES, INC. MB520ND Processor CX M1/AM K5/Pentium Processor Speed 75/90/100/120/133/150/166/180/200MHz Chip Set Unidentified Video Chip Set None Maximum Onboard 128MB (EDO supported) Memory Maximum Video None Memory Cache 256/512KB BIOS Award Dimensions 254mm x 218mm I/O Options 32-bit PCI slots (4), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), cache slot, IR connector, USB connector NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Floppy drive interface CN1 IR connector J10 IDE interface 1 CN2 Speaker J11 IDE interface 2 CN3 Reset switch J19 USB connector J1 IDE interface LED JP14 PS/2 mouse interface J2 Green PC connector JP15 Power LED & keylock J3 Chassis fan power JP18 Serial port 1 J6 32-bit PCI slots PC1 – PC4 Serial port 2 J7 Cache slot SL1 Parallel port J9 USER CONFIGURABLE SETTINGS Function Label Position Flash BIOS type select JP9 Pins 1 & 2 SST/Winbond/ATMEL/MX closed Flash BIOS type select Intel JP9 Pins 2 & 3 closed Flash BIOS voltage select 12v JP10 Pins 2 & 3 closed Flash BIOS voltage select 5v JP10 Pins 1 & 2 closed » CMOS memory normal operation JP16 Open CMOS memory clear JP16 Closed DRAM CONFIGURATION Size Bank 0 Bank 1 8MB (2) 1M x 36 None 16MB (2) 2M x 36 None 16MB (2) 1M x 36 (2) 1M 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 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 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. Banks are interchangeable. DIMM CONFIGURATION Size Bank 0 Bank 1 8MB (1) 1M x 64 None 16MB (1) 2M x 64 None 16MB (1) 1M x 64 (1) 1M x 64 24MB (1) 2M x 64 (1) 1M x 64 32MB (1) 4M x 64 None 32MB (1) 2M x 64 (1) 2M x 64 40MB (1) 4M x 64 (1) 1M x 64 48MB (1) 4M x 64 (1) 2M x 64 64MB (1) 4M x 64 (1) 4M x 64 Note: Banks are interchangeable. CACHE CONFIGURATION Size Bank 0 SL1 256KB None 256KB module installed 256KB (2) 32K x 32 Not installed 512KB (2) 32K x 32 256KB module installed 512KB (2) 64K x 32 Not installed 512KB None 512KB module installed CPU SPEED SELECTION (AMD) CPU speed Clock Multiplier JP2 JP3 JP6 JP7 speed 75MHz 50MHz 1.5x 1 & 2 1 & 2 2 & 3 2 & 3 90MHz 60MHz 1.5x 1 & 2 1 & 2 1 & 2 2 & 3 100MHz 66MHz 1.5x 1 & 2 1 & 2 1 & 2 1 & 2 120MHz 60MHz 1.5x 1 & 2 1 & 2 1 & 2 2 & 3 133MHz 66MHz 1.5x 1 & 2 1 & 2 1 & 2 1 & 2 150MHz 60MHz 2x 1 & 2 2 & 3 1 & 2 2 & 3 166MHz 66MHz 2x 1 & 2 2 & 3 1 & 2 1 & 2 Note: Pins designated should be in the closed position. CPU SPEED SELECTION (CYRIX) CPU speed Clock Multiplier JP2 JP3 JP6 JP7 speed 120MHz 50MHz 2x 1 & 2 2 & 3 2 & 3 2 & 3 133MHz 55MHz 2x 1 & 2 2 & 3 2 & 3 1 & 2 150MHz 60MHz 2x 1 & 2 2 & 3 1 & 2 2 & 3 166MHz 66MHz 2x 1 & 2 2 & 3 1 & 2 1 & 2 200MHz 50MHz 1.5x 1 & 2 1 & 2 2 & 3 2 & 3 Note: Pins designated should be in the closed position. CPU SPEED SELECTION (INTEL) CPU speed Clock Multiplier JP2 JP3 JP6 JP7 speed 75MHz 50MHz 1.5x 1 & 2 1 & 2 2 & 3 2 & 3 90MHz 60MHz 1.5x 1 & 2 1 & 2 1 & 2 2 & 3 100MHz 66MHz 1.5x 1 & 2 1 & 2 1 & 2 1 & 2 120MHz 60MHz 2x 1 & 2 2 & 3 1 & 2 2 & 3 133MHz 66MHz 2x 1 & 2 2 & 3 1 & 2 1 & 2 150MHz 60MHz 2.5x 2 & 3 2 & 3 1 & 2 2 & 3 166MHz 66MHz 2.5x 2 & 3 2 & 3 1 & 2 1 & 2 180MHz 60MHz 3x 2 & 3 1 & 2 1 & 2 2 & 3 200MHz 66MHz 3x 2 & 3 1 & 2 1 & 2 1 & 2 Note: Pins designated should be in the closed position. CPU TYPE SELECTION Type J13 J14 J15 J16 CX 6X86 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed closed AM K5 (B, Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 C, F) closed closed closed closed AM K5 (H, Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 J, K) closed closed closed closed P54C Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed closed P55C Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed closed CPU VOLTAGE SELECTION (SINGLE) Voltage JP5 JP17 3.38v Pins 7 & 8 closed Pins 2 & 3 closed 3.52v Pins 9 & 10 closed Pins 1 & 2 closed CPU VOLTAGE SELECTION (DUAL) Voltage V core JP5 JP17 3.38v 2.5v Pins 1 & 2 Pins 2 & 3 closed closed 3.38v 2.7v Pins 3 & 4 Pins 2 & 3 closed closed 3.38v 2.93v Pins 5 & 6 Pins 2 & 3 closed closed 3.52v 2.5v Pins 1 & 2 Pins 1 & 2 closed closed 3.52v 2.7v Pins 3 & 4 Pins 1 & 2 closed closed 3.52v 2.93v Pins 5 & 6 Pins 1 & 2 closed closed -