UNIDENTIFIED
TURBO 640
| Processor | 8088 | 
| Processor Speed | 8MHz | 
| Chip Set | None | 
| Max. onboard DRAM | 640KB | 
| Cache | None | 
| BIOS | Unknown | 
| Dimensions | 330mm x 218mm | 
| I/O Options | None | 
| NPU Options | 8087 | 
 
| CONNECTIONS | |||
| Purpose | Location | Purpose | Location | 
| Turbo switch | JP5 | Power/Turbo LED | JP9 | 
| Keylock | JP8 | Speaker | P4 | 
| Note:The exact locations of JP5 and JP8 are unknown. | |||
| USER CONFIGURABLE SETTINGS | |||
| Function | Jumper/Switch | Position | |
| » | Factory configured - do not alter | JP1 | Unknown | 
| » | Factory configured - do not alter | SW1/switch 1 | Off | 
| » | NPU enabled | SW1/switch 2 | Off | 
| NPU disabled | SW1/switch 2 | On | |
| DRAM CONFIGURATION | ||||||
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | JP3 | JP4 | 
| 256KB | (8) 4164 | (8) 4164 | (8) 4164 | (8) 4164 | A & B closed | B closed | 
| 256KB | (8) 41256 | NONE | NONE | NONE | C & D closed | A closed | 
| 512KB | (8) 41256 | (8) 41256 | NONE | NONE | C & D closed | A closed | 
| 640KB | (8) 41256 | (8) 41256 | (8) 4164KB | (8) 4164KB | C & D closed | A closed | 
| TURBO CONFIGURATION | ||
| Mode | JP6 | JP7 | 
| Software switch | Open | Closed | 
| Hardware switch | Closed | Open | 
| DISPLAY CONFIGURATION | ||||
| Display Adapter | SW1/5 | SW1/6 | SW1/7 | SW1/8 | 
| None | On | On | N/A | N/A | 
| Color/Graphics (40x20) | Off | On | On | On | 
| Color/Graphics (80x25) | On | Off | On | On | 
| Monochrome or Both | Off | Off | On | On | 
| FLOPPY DRIVE CONFIGURATION | ||
| Drives Installed | SW1/7 | SW1/8 | 
| 1 | On | On | 
| 2 | Off | On | 
| 3 | On | Off | 
| 4 | Off | Off |