SPRING CIRCLE COMPUTER, INC. ST586 REV. P550 PCI MB Processor CX M1/Pentium Processor Speed 75/90/100/120/133/150/166MHz Chip Set Intel Video Chip Set None Maximum Onboard 128MB (EDO supported) Memory Maximum Video Memory None Cache 256/512KB BIOS AMI/Award Dimensions 280mm x 220mm I/O Options 32-bit PCI slots (4), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, serial ports (2), cache slot, VRM connector NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Serial port 2 J1 Turbo LED J11 pins 2 & 3 Serial port 1 J2 Green PC connector J11 pins 4 & 5 Floppy drive J3 Turbo switch J11 pins 6 & interface 7 Parallel port J4 Reset switch J11 pins 9 & 10 IDE interface 2 J5 Power LED & J11 pins 11 - keylock 15 IDE interface 1 J6 Speaker J11 pins 17 - 20 VRM connector J8 32-bit PCI slots PC1 - PC4 External battery J9 Cache slot SL1 IDE interface LED J10 USER CONFIGURABLE SETTINGS Function Label Position Jumper information unavailable J12 Unidentified » Flash BIOS voltage select 5v JP4 Pins 1 & 2 closed Flash BIOS voltage select 12v JP4 Pins 2 & 3 closed » CMOS memory normal operation JP5 Open CMOS memory clear JP5 Closed » Parallel port IRQ select IRQ7 JR1 Pins 1 & 2 closed Parallel port IRQ select IRQ5 JR1 Pins 2 & 3 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) 1M x 36 (2) 2M x 36 32MB (2) 4M x 36 None 32MB (2) 2M x 36 (2) 2M x 36 40MB (2) 1M x 36 (2) 4M x 36 48MB (2) 2M x 36 (2) 4M x 36 64MB (2) 8M x 36 None 64MB (2) 4M x 36 (2) 4M x 36 72MB (2) 1M x 36 (2) 8M x 36 80MB (2) 2M x 36 (2) 8M x 36 96MB (2) 4M x 36 (2) 8M x 36 128MB (2) 8M x 36 (2) 8M x 36 128MB (2) 16M x 36 None CACHE CONFIGURATION Size Bank 0 TAG SL1 256KB (A) (8) 32K x 8 (1) 8K x 8 Not installed 256KB (B) None (1) 8K x 8 256KB module installed 512KB (A) (8) 64K x 8 (1) 32K x 8 Not installed 512KB (B) None (1) 32K x 8 512KB module installed CACHE JUMPER CONFIGURATION Size JP7 JP9 None Pins 1 & 2 closed Pins 1 & 2, 4 & 5 closed 256KB (A) Pins 2 & 3 closed Pins 1 & 2, 5 & 6 closed 256KB (B) Open Open 512KB (A) Pins 1 & 2 closed Pins 2 & 3, 4 & 5 closed 512KB (B) Open Open CACHE VOLTAGE CONFIGURATION Size JP6 3.3v Pins 2 & 3 closed » 5v mixed Pins 1 & 2 closed CPU SPEED SELECTION (CYRIX) Speed JP1 JP2 JP3 JP8 120MHz Pins 2 & 3 Pins 2 & 3 Pins 1 & 2 Pins 1 & 2, 5 closed closed closed & 6 closed 150MHz Pins 2 & 3 Pins 1 & 2 Pins 2 & 3 Pins 1 & 2, 5 closed closed closed & 6 closed 166MHz Pins 1 & 2 Pins 2 & 3 Pins 2 & 3 Pins 1 & 2, 5 closed closed closed & 6 closed CPU SPEED SELECTION (INTEL) Speed JP1 JP2 JP3 JP8 75MHz Pins 2 & 3 Pins 2 & 3 Pins 1 & 2 Pins 1 & 2, 4 closed closed closed & 5 closed 90MHz Pins 2 & 3 Pins 1 & 2 Pins 2 & 3 Pins 1 & 2, 4 closed closed closed & 5 closed 100MHz Pins 1 & 2 Pins 2 & 3 Pins 2 & 3 Pins 1 & 2, 4 closed closed closed & 5 closed 120MHz Pins 2 & 3 Pins 1 & 2 Pins 2 & 3 Pins 1 & 2, 5 closed closed closed & 6 closed 133MHz Pins 1 & 2 Pins 2 & 3 Pins 2 & 3 Pins 1 & 2, 5 closed closed closed & 6 closed 150MHz Pins 2 & 3 Pins 1 & 2 Pins 2 & 3 Pins 2 & 3, 5 closed closed closed & 6 closed 166MHz Pins 1 & 2 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3, 5 closed closed closed & 6 closed CPU VOLTAGE SELECTION Voltage JP10 3.3v Pins 1 & 2 closed » 3.4v Pins 2 & 3 closed 3.5v Pins 4 & 5 closed CPU VOLTAGE SELECTION Setting J8 Regular CPU voltage Pins 4 & 5, 6 & 7, 19 & 20, 21 & 22 closed VRM module for CPU voltage Open DMA CHANNEL SELECTION Channel JR2 » 1 Pins 1 & 2, 4 & 5 closed 3 Pins 2 & 3, 5 & 6 closed