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 |