LEADING TECHNOLOGY
386SX 25/33
|
Processor |
80386SX |
|
Processor Speed |
25/33MHz |
|
Chip Set |
Unidentified |
|
Max. Onboard DRAM |
4MB |
|
Cache |
None |
|
BIOS |
Unidentified |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
Floppy drive interface, game port, IDE interface, parallel port, serial ports (2) |
|
NPU Options |
80387SX |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Serial port 1 |
CN1 |
Reset switch |
J2 pin 5 |
|
Serial port 2 |
CN2 |
Ground |
J2 pin 8 |
|
Game port |
CN3 |
Speaker |
J8 |
|
Parallel port |
CN4 |
External battery |
J9 |
|
IDE interface LED |
J1 |
IDE interface |
J10 |
|
Power LED & keylock |
J2 pin 3 |
Floppy drive interface |
J12 |
|
Turbo switch |
J2 pin 4 |
Riser Card |
SL1 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
NPU disabled |
JP1 |
pins 1 & 2 closed |
|
NPU enabled |
JP1 |
pins 2 & 3 closed | |
|
|
External battery installed |
JP6 |
pins 1 & 2 closed |
|
External battery not installed |
JP6 |
pins 2 & 3 closed | |
|
|
Parity disabled (3 SIMM motherboard) |
JP15 |
Open |
|
Parity enabled (4 SIMM motherboard) |
JP15 |
Closed | |
|
|
Parallel port IRQ select IRQ7 |
JP34 |
pins 1 & 2 closed |
|
Parallel port IRQ select IRQ5 |
JP34 |
pins 2 & 3 closed | |
|
|
IDE interface enabled |
JP35 |
pins 2 & 3 closed |
|
IDE interface disabled |
JP35 |
pins 1 & 2 closed | |
|
|
Game port installed |
JP42 |
pins 1 & 2 closed |
|
Game port not installed |
JP42 |
pins 2 & 3 closed | |
|
DRAM CONFIGURATION (WITH BANK 0A FACTORY INSTALLED) | ||||
|
Size |
Bank 0a |
Bank 1 |
Bank 2 |
Bank 3 |
|
1MB |
(2) 1M x 4 |
NONE |
NONE |
NONE |
|
2MB |
(2) 1M x 4 |
(1) 1M x 9 |
NONE |
NONE |
|
4MB |
(2) 1M x 4 |
(1) 1M x 9 |
(1) 1M x 9 |
(1) 1M x 9 |
|
Note: This configuration is applicable only with Bank O factory installed. The mainboard is manufactured with either 4 SIMM banks or 3 SIMM banks and 2 DRAM banks. The 2 DRAM banks are factory installed and are not configurable. | ||||
|
DRAM JUMPER CONFIGURATION (WITH BANK 0 FACTORY INSTALLED) | |
|
Size |
JP11-12, JP16, JP19-27 |
|
1MB |
pins 2 & 3 closed |
|
2MB |
pins 2 & 3 closed |
|
4MB |
pins 2 & 3 closed |
|
Note: This configuration is applicable only with Bank O factory installed. | |
|
DRAM CONFIGURATION (WITH BANK 0 USER INSTALLED) | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
2MB |
(1) 1M x 9 |
(1) 1M x 9 |
NONE |
NONE |
|
4MB |
(1) 1M x 9 |
(1) 1M x 9 |
(1) 1M x 9 |
(1) 1M x 9 |
|
Note: This configuration is applicable only with Bank O user installed. | ||||
|
DRAM CONFIGURATION (WITH BANK 0 USER INSTALLED) | |
|
Size |
JP11-12, JP16, JP19-27 |
|
2MB |
pins 2 & 3 closed |
|
4MB |
pins 2 & 3 closed |
|
Note: This configuration is applicable only with Bank O user installed. | |
|
PARALLEL PORT CONFIGURATION | ||
|
Parallel port |
JP30 |
JP31 |
|
LPT1 (0378h) |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
LPT1 (02BCh) |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
LPT2 (0278h) |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
SERIAL PORT 1 CONFIGURATION | |||
|
Port 1 |
JP28 |
JP40 | |
|
COM 1 |
pins 2 & 3 closed |
pins 1 & 2 closed | |
|
COM 3 |
pins 1 & 2 closed |
pins 2 & 3 closed | |
|
COM 4 |
pins 2 & 3 closed |
pins 2 & 3 closed | |
|
Disabled |
pins 1 & 2 closed |
pins 1 & 2 closed | |
|
SERIAL PORT 1 INTERRUPT CONFIGURATION | |||
|
IRQ |
JP32 |
JP39 | |
|
IRQ4 |
pins 1 & 2 closed |
N/A | |
|
IRQ3 |
pins 1 & 2 closed |
pins 1 & 2 closed | |
|
SERIAL PORT 2 CONFIGURATION | |||
|
Port 2 |
JP29 |
JP41 | |
|
COM 2 |
pins 2 & 3 closed |
pins 1 & 2 closed | |
|
COM 3 |
pins 2 & 3 closed |
pins 2 & 3 closed | |
|
COM 4 |
pins 1 & 2 closed |
pins 2 & 3 closed | |
|
Disabled |
pins 1 & 2 closed |
pins 1 & 2 closed | |
|
SERIAL PORT 2 INTERRUPT CONFIGURATION | |||
|
IRQ |
JP32 |
JP39 | |
|
IRQ3 |
N/A |
pins 1 & 2 closed | |
|
IRQ4 |
pins 2 & 3 closed |
pins 2 & 3 closed | |
|
FLOPPY DRIVE CONFIGURATION | ||
|
Type |
JP37 |
JP44 |
|
A = 3.5" & B = 5.25" |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
A = 5.25" & B = 3.5" |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
PAGE INTERLEAVE CONFIGURATION | ||
|
Mode |
JP14 |
JP18 |
|
Disabled |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
Enabled ( requires 4 SIMM configuration) |
pins 2 & 3 closed |
pins 2 & 3 closed |