STEP 386CX Motherboard Settings and Configuration
EVEREX SYSTEMS, INC.
STEP 386CX
Processor | 80286/80386SX |
Processor Speed | Unidentified |
Chip Set | Unidentified |
Video Chip Set | None |
Maximum Onboard Memory | 8MB |
Maximum Video Memory | None |
Cache | None |
BIOS | Unidentified |
Dimensions | 254mm x 218mm |
I/O Options | Parallel port, serial ports (2), Instep Board connector |
NPU Options | 80287/80387SX |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Serial port 1 | CN1 | Parallel port | CN3 |
Serial port 2 | CN2 | Instep Board connector | CN4 |
USER CONFIGURABLE SETTINGS | |||
Function | Label | Position | |
IDE interface enabled | J4 | Open | |
IDE interface disabled | J4 | Closed | |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
512KB | (2) 256K x 9 | None | None | None |
1MB | (2) 256K x 9 | (2) 256K x 9 | None | None |
2MB | (2) 1M x 9 | None | None | None |
2.5MB | (2) 256K x 9 | (2) 1M x 9 | None | None |
2.5MB | (2) 1M x 9 | (2) 256K x 9 | None | None |
4MB | (2) 1M x 9 | (2) 1M x 9 | None | None |
6MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | None |
8MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 |
SERIAL PORT 1 INTERRUPT SELECTION | ||
IRQ | JP2 | |
IRQ3 | Pins 9 & 10 closed | |
| » | IRQ4 | Pins 11 & 12 closed |
SERIAL PORT 2 INTERRUPT SELECTION | ||
IRQ | JP2 | |
| » | IRQ3 | Pins 5 & 6 closed |
IRQ4 | Pins 7 & 8 closed | |
PARALLEL PORT INTERRUPT SELECTION | ||
IRQ | JP2 | |
IRQ5 | Pins 3 & 4 closed | |
| » | IRQ7 | Pins 1 & 2 closed |
HANDSHAKE SELECTION (PORT 1) | |
Setting | JP3 |
Enabled | 1 & 2, 4 & 5, 7 & 8, 10 & 11 |
Disabled | 2 & 3, 5 & 6, 8 & 9, 11 & 12 |
Note: Pins designated should be in the closed position. | |
HANDSHAKE SELECTION (PORT 2) | |
Setting | JP4 |
Enabled | 1 & 2, 4 & 5, 7 & 8, 10 & 11 |
Disabled | 2 & 3, 5 & 6, 8 & 9, 11 & 12 |
Note: Pins designated should be in the closed position. | |
DTE/DCE SELECTION (PORT 1) | |
Setting | JP5 |
DTE | 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10, 11 & 12 |
DCE | 1 & 3, 2 & 4, 5 & 7, 6 & 8, 9 & 11, 12 & 14 |
Note: Pins designated should be in the closed position. | |
DTE/DCE SELECTION (PORT 2) | |
Setting | JP6 |
DTE | 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10, 11 & 12 |
DCE | 1 & 3, 2 & 4, 5 & 7, 6 & 8, 9 & 11, 12 & 14 |
Note: Pins designated should be in the closed position. | |
MISCELLANEOUS TECHNICAL NOTE |
To upgrade to an 80386SX processor, install 80386SX Instep Board at CN4. |
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