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 |