UNIDENTIFIED
TURBO MAIN BOARD
| Processor | 8088 | 
| Processor Speed | 8MHz | 
| Chip Set | Unidentified | 
| Max. Onboard DRAM | 640KB | 
| Cache | None | 
| BIOS | Unidentified | 
| Dimensions | 330mm x 218mm | 
| I/O Options | None | 
| NPU Options | 8087 | 
 
| CONNECTIONS | |||
| Purpose | Location | Purpose | Location | 
| Reset switch | JP1 | Turbo LED | P6 pins 1 & 2 | 
| Turbo LED | P3 | Reset switch | P6 pins | 
| Speaker | P4 | Keylock | P6 pins | 
| Turbo switch | P5 | Turbo LED | P7 | 
| USER CONFIGURABLE SETTINGS | |||
| Function | Jumper/Switch | Position | |
| » | Turbo enabled | P5 | pins 1 & 2 closed | 
| Turbo disabled | P5 | pins 3 & 4 closed | |
| » | Turbo enabled | SW2/1 | Off | 
| Turbo disabled | SW2/1 | On | |
| » | NPU disabled | SW2/2 | On | 
| NPU enabled | SW2/2 | Off | |
| DRAM CONFIGURATION | ||||
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | 
| 64KB | (9) 4164 | NONE | NONE | NONE | 
| 128KB | (9) 4164 | (9) 4164 | NONE | NONE | 
| 192KB | (9) 4164 | (9) 4164 | (9) 4164 | NONE | 
| 256KB | (9) 4164 | (9) 4164 | (9) 4164 | (9) 4164 | 
| 256KB | (9) 41256 | NONE | NONE | NONE | 
| 640KB | (9) 41256 | (9) 41256 | (9) 4164 | (9) 4164 | 
| DRAM SWITCH CONFIGURATION | ||
| Size | SW2/3 | SW2/4 | 
| 64KB | On | On | 
| 128KB | Off | On | 
| 192KB | Off | On | 
| 256KB | Off | Off | 
| 640KB | Off | Off | 
| DRAM SWITCH CONFIGURATION | |
| Size | JP2 | 
| Bank 0 & 1 = 41256 | Closed | 
| Bank 2 & 3 = 4164 | Closed | 
| DRAM SWITCH CONFIGURATION | |
| Size | JP2 | 
| Bank 0 & 1 = 4164 | Open | 
| Bank 2 & 3 = 4164 | Open | 
| MONITOR CONFIGURATION | ||
| Type | SW2/5 | SW2/6 | 
| Monochrome | Off | Off | 
| 40 x 25 color | Off | On | 
| 80 x 25 color | On | Off | 
| FLOPPY DRIVE CONFIGURATION | ||
| Type | SW2/7 | SW2/8 | 
| 1 | On | On | 
| 2 | Off | On | 
| 3 | On | Off | 
| 4 | Off | Off |