FIRST INTERNATIONAL COMPUTER, INC.
LEO 486-PSD-10
|
Processor |
80486SX/80486DX/80486DX2/80486DX4/Pentium Overdrive |
|
Processor Speed |
25/33/40/50(internal)/66(internal)/100(internal)MHz |
|
Chip Set |
INTEL |
|
Max. Onboard DRAM |
128MB |
|
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 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Bus mouse connector |
CN1 |
IDE LED |
J11 |
|
P/S2 mouse connector |
CN4 |
Green power supply connector |
J16 |
|
Floppy drive interface |
CN6 |
Turbo switch |
J29 |
|
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 (80486DX4) |
PS3V |
|
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 device |
J8 |
open |
|
SCSI power source from system |
J8 |
closed | |
|
IDE connector pin 27 linked to IOCHRDY signal |
J9 |
closed | |
|
IDE connector pin 27 open |
J9 |
open | |
|
IDE connector pin 28 linked to BALE signal |
J10 |
closed | |
|
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 write-back cache |
J27 |
pins 1 & 2 closed |
|
Pentium Overdrive internal write-through cache |
J27 |
pins 2 & 3 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 SL-enhan/DX4/Pentium overdrive |
JF9 |
pins 2 & 3 closed | |
|
Saturn II/II-50 chipset with other CPUs |
JF9 |
pins 1 & 2 closed | |
|
Saturn II/II-50 chipset for Saturn B-step chipset use |
JF9 |
open | |
|
|
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 36 |
(1) 256K x 36 |
NONE |
NONE |
|
4MB |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
8MB |
(1) 1M x 36 |
(1) 1M x 36 |
NONE |
NONE |
|
10MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
(1) 256K x 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 36 |
(1) 16M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
72MB |
(1) 16M x 36 |
(1) 16M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
96MB |
(1) 16M x 36 |
(1) 16M x 36 |
(1) 16M x 36 |
(1) 16M x 36 |
|
128MB |
(1) 16M x 36 |
(1) 16M x 36 |
(1) 16M x 36 |
(1) 16M x 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 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
Standard |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 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. |