FIRST INTERNATIONAL COMPUTER, INC. LEO 486-PSD-10 Processor 80486SX/80486DX/80486DX2/80486DX4/Pentium Overdrive Processor 25/33/40/50(internal)/66(internal)/100(internal)MHz Speed Chip Set INTEL Max. Onboard 128MB DRAM Cache 64/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options Floppy drive interface, IDE interface,mouse connector, parallel port, P/S2 mouse connector, serial ports (2), VGA connector NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Bus mouse connector CN1 IDE LED J11 P/S2 mouse CN4 Green power supply J16 connector connector Floppy drive CN6 Turbo switch J29 interface IDE connector CN7 Turbo LED J30 Serial port 1 CN8 Reset switch J31 Serial port 2 CN9 Speaker J32 Parallel port CN10 Power LED & keylock J33 SCSI connector CN11 PCI slots PCI 1, 2, & 3 SCSI busy LED J7 3.3V daughter board PS3V (80486DX4) USER CONFIGURABLE SETTINGS Function Jumper Position » CPU generate parity J4 pins 1 & 2 closed DPU generate parity J4 pins 2 & 3 closed » Do not force parity error J5 pins 1 & 2 closed Force parity error J5 pins 2 & 3 closed » SCSI enable J6 closed SCSI disable J6 open » SCSI power source from peripheral J8 open device SCSI power source from system J8 closed IDE connector pin 27 linked to J9 closed IOCHRDY signal IDE connector pin 27 open J9 open IDE connector pin 28 linked to BALE J10 closed signal IDE connector pin 28 open J10 open » Normal operation J17 Open Clear password J17 closed » Saturn B-step chip J23 pins 1 & 2 closed Saturn II/II-50 J23 pins 2 & 3 closed » Cache set at 256K J24 pins 2 & 3 closed Cache set at 64K J24 pins 1 & 2 closed Level 2 write-back cache J25 pins 1 & 2 closed Level 2 write-through cache J25 pins 2 & 3 closed » 80486DX4 2.5X mode J26 pins 2 & 3 closed 80486DX4 2X mode J26 pins 1 & 2 closed 80486DX4 3X mode J26 open » Pentium Overdrive internal J27 pins 1 & 2 write-back cache closed Pentium Overdrive internal J27 pins 2 & 3 write-through cache closed » No cache wait state JF3 pins 2 & 3 closed One cache wait state JF3 pins 1 & 2 closed Saturn II/II-50 chipset with JF9 pins 2 & 3 SL-enhan/DX4/Pentium overdrive closed Saturn II/II-50 chipset with other JF9 pins 1 & 2 CPUs closed Saturn II/II-50 chipset for Saturn JF9 open B-step chipset use » PCI SCSI IRQ at IRQ9 JN1 pins 1 & 2 closed PCI SCSI IRQ at IRQ11 JN1 pins 2 & 3 closed DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 2MB (1) 256K x (1) 256K x NONE NONE 36 36 4MB (1) 256K x (1) 256K x (1) 256K x (1) 256K x 36 36 36 36 8MB (1) 1M x 36 (1) 1M x 36 NONE NONE 10MB (1) 1M x 36 (1) 1M x 36 (1) 256K x (1) 256K x 36 36 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 32MB (1) 4M x 36 (1) 4M x 36 NONE NONE 34MB (1) 4M x 36 (1) 4M x 36 (1) 1M x 36 (1) 256K x 36 40MB (1) 4M x 36 (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 64MB (1) 16M x 36 (1) 16M x 36 NONE NONE DRAM CONFIGURATION (CONTINUED) Size Bank 0 Bank 1 Bank 2 Bank 3 66MB (1) 16M x (1) 16M x (1) 256K x (1) 256K x 36 36 36 36 72MB (1) 16M x (1) 16M x (1) 1M x 36 (1) 1M x 36 36 36 96MB (1) 16M x (1) 16M x (1) 16M x 36 (1) 16M x 36 36 36 128MB (1) 16M x (1) 16M x (1) 16M x 36 (1) 16M x 36 36 36 Note:A {(1) 32M x 36} is a double RAS SIMM. CACHE CONFIGURATION Size Data RAM TAG RAM U32 (dirty bit) 64KB (8) 8K x 8 (1) 1K x 8 64K x 1 256KB (8) 32K x 8 (1) 32K x 8 64K x 1 CACHE JUMPER CONFIGURATION Size J14 J15 J18 J19 64KB Open Open Open Open 256KB Closed Closed Closed Closed CACHE INTERLEAVE CONFIGURATION Type J20 J21 J22 Interleave pins 2 & 3 pins 1 & 2 pins 1 & 2 closed closed closed Standard pins 1 & 2 pins 2 & 3 pins 2 & 3 closed closed closed Note:Interleave setting is for the Saturn II-50 chipset only. CPU TYPE CONFIGURATION Type JC1 JC2, JC3 80486SX Open pins 2 & 3 80486DX Open pins 1 & 2 80486DX2 Open pins 1 & 2 80486DX4 Open pins 1 & 2 Pentium Overdrive Closed pins 1 & 2 CPU TYPE CONFIGURATION (CONTINUED) Type JC4, J12 JC5 JC6 80486SX 1 Closed Open pins 1 & 2 80486SX 2 Closed Open pins 1 & 2 80486DX 1 Closed Open pins 1 & 2 80486DX 2 Closed Open pins 1 & 2 80486DX2 1 Closed Open pins 1 & 2 80486DX2 2 Closed Open pins 1 & 2 80486DX4 1 Closed Open pins 1 & 2 80486DX4 2 Closed Closed pins 2 & 3 CPU TYPE CONFIGURATION (CONTINUED) Type JC4, J12 JC5 JC6 SL enhanced 1 Closed open pins 1 & 2 SL enhanced 2 Closed closed pins 2 & 3 Pentium Overdrive 1 Open open pins 1 & 2 Pentium Overdrive 2 Open closed pins 2 & 3 Note: 1 denotes Saturn B-step chipset used with CPU. 2 denotes Saturn II/II-50 chipset used with CPU. CPU CLOCK (VT8225N) CONFIGURATION Speed JK1 JK2 CLK2 50 Mhz pins 1 & 2 closed pins 2 & 3 closed CLK2 66.6 Mhz pins 2 & 3 closed pins 1 & 2 open CPU SPEED CONFIGURATION Speed JF6 JF7 Reserved pins 2 & 3 pins 1 & 2 25MHz pins 1 & 2 pins 1 & 2 33Mhz pins 1 & 2 pins 2 & 3 50iMHz pins 1 & 2 pins 1 & 2 50iMHz 1 pins 2 & 3 pins 2 & 3 66iMHz pins 1 & 2 pins 2 & 3 Note: 1 denotes Saturn II-50 chipset only. PCI1 IRQ SELECTION Jumper IRQ Setting JI1 IRQ5 pins 1 & 2 closed JI2 IRQ9 pins 1 & 2 closed JI3 IRQ10 pins 1 & 2 closed JI4 IRQ11 pins 1 & 2 closed JI5 IRQ12 pins 1 & 2 closed JI6 IRQ14 pins 1 & 2 closed JI7 IRQ15 pins 1 & 2 closed PCI2 & PCI3 IRQ SELECTION Jumper IRQ Setting JI1 IRQ5 pins 2 & 3 closed JI2 IRQ9 pins 2 & 3 closed JI3 IRQ10 pins 2 & 3 closed JI4 IRQ11 pins 2 & 3 closed JI5 IRQ12 pins 2 & 3 closed JI6 IRQ14 pins 2 & 3 closed JI7 IRQ15 pins 2 & 3 closed TAG ADDRESS CONFIGURATION Address JF1 JF2 8-bit pins 1 & 2 closed pins 1 & 2 closed 7-bit pins 1 & 2 closed pins 2 & 3 closed 9-bit pins 2 & 3 closed pins 1 & 2 closed Reserved pins 2 & 3 closed pins 2 & 3 closed MISCELLANEOUS TECHNICAL NOTE Note:1. When using the PCI1 slot on the mainboard, jumper choice should only be limited to pins 1 & 2 of jumpers JI1 to JI7 2. When using PCI2 or PCI3 slots on the mainboard, jumper choice should only be limited to pins 2 & 3 of jumpers JI1 to JI7. 3. When using the Saturn B-step chipset, PCI1 slot serves as the master slot while PCI2 and PCI 3 slots serve as slave slots. 4. When using the Saturn II/II-50 chipset, PCI1, PCI2, PCI3 slots can serve both as master or slave slot.