LEADING EDGE PRODUCTS, INC.
MODEL D3/SX (VERSION 1)
| Processor | 80386SX | 
| Processor Speed | 16MHz | 
| Chip Set | Zymos | 
| Max. onboard DRAM | 4MB | 
| Cache | None | 
| BIOS | Leading Edge | 
| Dimensions | 325mm x 308mm | 
| I/O Options | Floppy drive interface, mouse port, parallel port, serial ports (2) | 
| NPU Options | 80387SX | 
 
| CONNECTIONS | |||
| Purpose | Location | Purpose | Location | 
| Mouse port | CN1 | Parallel port | CN4 | 
| Serial port 2 | CN2 | Floppy drive interface | CN5 | 
| Serial port 1 | CN3 | ||
| USER CONFIGURABLE SETTINGS | |||
| Function | Jumper | Position | |
| » | Floppy drive interface enabled | J19 | pins 2 & 3 closed | 
| Floppy drive interface disabled | J19 | pins 1 & 2 closed | |
| » | Monitor type select color | J26 | pins 2 & 3 closed | 
| Monitor type select monochrome | J26 | pins 1 & 2 closed | |
| DRAM CONFIGURATION | ||||
| Size | Bank 0 | Bank 1 | J22 | J23 | 
| 512KB | (2) 256K x 9 | None | pins 2 & 3 | pins 2 & 3 | 
| 1MB | (2) 256K x 9 | (2) 256K x 9 | pins 1 & 2 | pins 2 & 3 | 
| 2MB | (2) 1M x 9 | NONE | pins 2 & 3 | pins 1 & 2 | 
| 4MB | (2) 1M x 9 | (2) 1M x 9 | pins 1 & 2 | pins 1 & 2 | 
| Note:Pins designated should be in the closed position. | ||||
| PARALLEL PORT CONFIGURATION | ||||
| IRQ | ADDRESS | J17 | J20 | |
| » | 7 | 378h | pins 2 & 3 closed | pins 2 & 3 closed | 
| 5 | 378h | pins 2 & 3 closed | pins 1 & 2 closed | |
| 7 | 278h | pins 1 & 2 closed | pins 2 & 3 closed | |
| 5 | 278h | pins 1 & 2 closed | pins 1 & 2 closed | |
| Disabled | Disabled | Open | Open | |
| SERIAL PORT CONFIGURATION | ||||
| Port 1 | Port 2 | J16 | J18 | |
| » | COM1 | COM2 | pins 1 & 2 closed | pins 1 & 2 closed | 
| COM1 | COM4 | pins 2 & 3 closed | pins 1 & 2 closed | |
| COM1 | Disabled | Open | pins 1 & 2 closed | |
| COM3 | COM2 | pins 1 & 2 closed | pins 2 & 3 closed | |
| Disabled | COM2 | pins 1 & 2 closed | Open | |
| COM3 | COM4 | pins 2 & 3 closed | pins 2 & 3 closed | |
| Disabled | COM4 | pins 2 & 3 closed | Open | |
| Disabled | Disabled | Open | Open | |
| MOUSE PORT INTERRUPTS | |||||
| IRQ | J11 | J12 | J13 | J14 | |
| » | IRQ9 | Closed | Open | Open | Open | 
| IRQ3 | Open | Closed | Open | Open | |
| IRQ4 | Open | Open | Closed | Open | |
| IRQ5 | Open | Open | Open | Closed | |