UNIDENTIFIED
12MHZ TURBO XT MAINBOARD
| Processor | 8088 | 
| Processor Speed | 12MHz | 
| Chip Set | Unidentified | 
| Max. Onboard DRAM | 640KB | 
| Cache | None | 
| BIOS | Unidentified | 
| Dimensions | 220mm x 220mm | 
| I/O Options | None | 
| NPU Options | 8087 | 
 
| CONNECTIONS | |||
| Purpose | Location | Purpose | Location | 
| Power LED | CN3 | Power LED & keylock | CN6 | 
| Reset switch | CN4 | Turbo LED | CN7 | 
| Speaker | CN5 | Turbo switch | CN8 | 
| USER CONFIGURABLE SETTINGS | |||
| Function | Jumper/Switch | Position | |
| » | Memory wait state select 0 wait states | J6 | Open | 
| Memory wait state select 1 wait state | J6 | Closed | |
| » | Parity check disabled | SW/1 | On | 
| Parity check enabled | SW/1 | Off | |
| » | Factory configured - do not alter | SW/2 | On | 
| DRAM CONFIGURATION | |||
| Size | Bank 0 | Bank 1 | Bank 2 | 
| 256KB | (2) 414256 & (1) 41256 | NONE | NONE | 
| 512KB | (2) 414256 & (1) 41256 | (2) 414256 & (1) 41256 | NONE | 
| 640KB | (2) 414256 & (1) 41256 | (2) 414256 & (1) 41256 | (2) 414256 & (1) 41256 | 
| DRAM SWITCH CONFIGURATION | ||
| Size | SW/3 | SW/4 | 
| 256KB | Off | On | 
| 512KB | On | Off | 
| 640KB | Off | Off | 
| MONITOR DISPLAY CONFIGURATION | ||
| Display | SW/5 | SW/6 | 
| Color (40 x 25) | Off | On | 
| Color (80 x 25) | On | Off | 
| Monochrome | Off | Off | 
| FLOPPY DRIVE CONFIGURATION | ||
| Drives installed | SW/7 | SW/8 | 
| 1 | On | On | 
| 2 | Off | On | 
| 3 | On | Off | 
| 4 | Off | Off |