AMERICAN RESEARCH CORPORATION
X TURBO
| Processor | 8088 | 
| Processor Speed | 4/6MHz | 
| Chip Set | Unidentified | 
| Max. Onboard DRAM | 640KB | 
| Cache | None | 
| BIOS | Unidentified | 
| Dimensions | 330mm x 218mm | 
| I/O Options | Proprietary slots (2) | 
| NPU Options | 8087 | 
 
| CONNECTIONS | |
| Purpose | Location | 
| Proprietary slots | SL1 - SL2 | 
| USER CONFIGURABLE SETTINGS | |||
| Function | Switch | Position | |
| » | 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 | On | Off | 
| 256KB | Off | Off | 
| 640KB | Off | Off | 
| DRAM SWITCH CONFIGURATION | ||||||||
| Size | SW3/1 | SW3/2 | SW3/3 | SW3/4 | SW3/5 | SW3/6 | SW3/7 | SW3/8 | 
| Bank 0 & 1 = 41256 | Off | On | Off | On | Off | On | Off | On | 
| Bank 2 & 3 = 4164 | Off | On | Off | On | Off | On | Off | On | 
| DRAM SWITCH CONFIGURATION (CON’T) | ||||||||
| Size | SW4/1 | SW4/2 | SW4/3 | SW4/4 | SW4/5 | SW4/6 | SW4/7 | SW4/8 | 
| Bank 0 & 1 = 41256 | Off | On | Off | On | Off | On | Off | On | 
| Bank 2 & 3 = 4164 | Off | On | Off | On | Off | On | Off | On | 
| DRAM SWITCH CONFIGURATION | ||||||||
| Size | SW3/1 | SW3/2 | SW3/3 | SW3/4 | SW3/5 | SW3/6 | SW3/7 | SW3/8 | 
| Bank 0 & 1 = 4164 | On | Off | On | Off | On | Off | On | Off | 
| Bank 2 & 3 = 4164 | On | Off | On | Off | On | Off | On | Off | 
| DRAM SWITCH CONFIGURATION (CON’T) | ||||||||
| Size | SW4/1 | SW4/2 | SW4/3 | SW4/4 | SW4/5 | SW4/6 | SW4/7 | SW4/8 | 
| Bank 0 & 1 = 4164 | On | Off | On | Off | On | Off | On | Off | 
| Bank 2 & 3 = 4164 | On | Off | On | Off | On | Off | On | Off | 
| 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 |