IT386 Motherboard Settings and Configuration
INFORMTECH INTERNATIONAL, INC.
IT386
Processor | 80386SX |
Processor Speed | 25/33MHz |
Chip Set | TI |
Max. Onboard DRAM | 16MB (12MB on external memory card) |
Cache | 32KB |
BIOS | Phoenix |
Dimensions | 318mm x 220mm |
I/O Options | Auxiliary keyboard connector, external memory card (IT-FEM386) |
NPU Options | 80387SX/3167 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Turbo switch | J8 | Power LED & keylock | P5 |
Turbo LED | P2 | Auxiliary keyboard connector | P20 |
Speaker | P3 | External battery | P22 |
Reset switch | P4 | External memory card | SL1 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper/Switch | Position | |
» | Turbo enabled | J8 | Open |
Turbo disabled | J8 | Closed | |
» | AT bus clock speed select 8MHz | J14 | pins 2 & 3 closed |
AT bus clock speed select 12MHz | J14 | pins 1 & 2 closed | |
» | Power good signal detect from power supply | J18 | pins 1 & 2 closed |
Power good signal detect from board | J18 | pins 2 & 3 closed | |
» | External memory card not installed | J25 | pins 1 & 2 closed |
External memory card installed | J25 | pins 2 & 3 closed | |
» | 80387 disabled (Weitek 3167 is auto detected) | SW1/1 | Off |
80387 enabled (Weitek 3167 is auto detected) | SW1/1 | On | |
» | Monitor type select monochrome | SW1/2 | Off |
Monitor type select color/EGA/VGA | SW1/2 | On | |
DRAM CONFIGURATION | |
Size | Bank 0 |
1MB | (4) 256K x 9 |
4MB | (4) 1M x 9 |
DRAM JUMPER CONFIGURATION | |||
Size | J1 | J12 | J13 |
1MB | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed |
4MB | pins 2 & 3 closed | pins 1 & 2 closed | pins 1 & 2 closed |
CACHE CONFIGURATION |
Note: 32KB cache is factory installed and is not configurable. The location is unidentified. |
DRAM SPEED CONFIGURATION | ||
CPU speed | DRAM speed | J7 |
25MHz | 120ns | Closed |
25MHz | 100ns | Open |
33MHz | 100ns | Closed |
33MHz | 80ns | Open |
CPU SPEED CONFIGURATION | |||||
CPU speed | NPU speed | J4 | J5 | J6 | J9 |
25MHz | 20MHz | 2 & 3 | 1 & 3, 2 & 4 | 2 & 3 | 2 & 3 |
25MHz | 25MHz | 2 & 3 | 2 & 4 | 1 & 2 | 2 & 3 |
33MHz | 25MHz | 1 & 2 | 1 & 2 | 2 & 3 | 1 & 2 |
33MHz | 33MHz | 1 & 2 | Open | 1 & 2 | 1 & 2 |
Note: Pins designated should be in the closed position. | |||||
I/O MODE CONFIGURATION | ||||
I/O bus mode | I/O wait state 8-bit | I/O wait state 16-bit | SW1/3 | SW1/4 |
1 | 4 | 1 | On | On |
2 | 6 | 2 | Off | On |
3 | 8 | 3 | On | Off |
4 | 10 | 4 | Off | Off |
BATTERY TYPE CONFIGURATION | |
Type | J19 |
4.5v | pins 3 & 4 closed |
3.6 - 4.5v | pins 1 & 3 closed |
6v (without internal current limiting resistor) | pins 1 & 2 closed |
6v (with internal current limiting resistor) | pins 2 & 4 closed |
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