UNIDENTIFIED
XTT
| Processor | 8088 | 
| Processor Speed | 4.77/8MHz | 
| Chip Set | Unidentified | 
| Video Chip Set | None | 
| Maximum Onboard Memory | 640KB | 
| Maximum Video Memory | None | 
| Cache | None | 
| BIOS | Unidentified | 
| Dimensions | 330mm x 218mm | 
| I/O Options | None | 
| NPU Options | 8087 | 
 
| CONNECTIONS | |||
| Purpose | Location | Purpose | Location | 
| Power LED & keylock | JP7 | Turbo switch | JP8 pins 3 & 4 | 
| Reset switch | JP8 pins 1 & 2 | Speaker | JP9 | 
| USER CONFIGURABLE SETTINGS | |||
| Function | Label | Position | |
| Wait state select 3 wait states | JP3 | Pins 2 & 3 closed | |
| Wait state select 2 wait states | JP3 | Pins 1 & 2 closed | |
| SW1/5 is set to on | JP5 | Closed | |
| SW1/5 is set to off | JP5 | Open | |
| » | Factory configured - do not alter | SW1/1 | Off | 
| NPU not installed | SW1/2 | On | |
| NPU installed | SW1/2 | Off | |
| DRAM CONFIGURATION | ||||
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | 
| 256KB | (9) 41256 | None | None | None | 
| 512KB | (9) 41256 | (9) 41256 | None | None | 
| 640KB | (9) 41256 | (9) 41256 | (9) 41256 | None | 
| 640KB | (9) 41256 | (9) 41256 | (9) 4164 | (9) 4164 | 
| DRAM JUMPER CONFIGURATION | |
| Number of banks with 41256 chips installed | JP4 | 
| 0 | Pins 1 & 3, 2 & 4 closed | 
| 1 | Pins 2 & 4 closed | 
| 2 | Pins 1 & 3 closed | 
| 3 | Open | 
| DRAM SWITCH CONFIGURATION | ||
| Banks used | SW1/3 | SW1/4 | 
| 1 | On | On | 
| 2 | On | Off | 
| 3 | Off | On | 
| 4 | Off | Off | 
| CPU SPEED SELECTION | |
| Speed | JP6 | 
| Switchable through keyboard | Pins 1 & 2 closed | 
| 4.77MHz | Open | 
| 8MHz | Pins 2 & 3 closed | 
| FLOPPY DRIVE SELECTION | ||
| Drives installed | SW1/7 | SW1/8 | 
| 1 | On | On | 
| 2 | On | Off | 
| 3 | Off | On | 
| 4 | Off | Off | 
| MONITOR SELECTION | ||
| Type | SW1/5 | SW1/6 | 
| EGA | On | On | 
| Color (80 x 25) | On | Off | 
| Color (40 x 25) | Off | On | 
| Monochrome | Off | Off | 
| BIOS SELECTION | |
| Type | JP2 | 
| 2764 | Pins 3 & 15, 4 & 14, 5 & 13, 6 & 12, 7 & 11, 8 & 10 closed | 
| 27128 | Pins 2 & 15, 3 & 14, 4 & 13, 5 & 12, 6 & 11, 7 & 10 closed | 
| 27256 | Pins 1 & 15, 2 & 14, 3 & 13, 4 & 12, 5 & 11, 6 & 10 closed |