UNIDENTIFIED
TURBO MAINBOARD (4.77/10MHZ)
Processor |
8088 |
Processor Speed |
4.77/10MHz |
Chip Set |
Unidentified |
Video Chip Set |
None |
Maximum Onboard Memory |
640KB |
Maximum Video Memory |
None |
Cache |
None |
BIOS |
Unidentified |
Dimensions |
276mm x 196mm |
I/O Options |
None |
NPU Options |
8087 |
CONNECTIONS | |||
Purpose |
Location |
Purpose |
Location |
Speaker |
JP1 |
Turbo LED |
JP5 pins 1 & 2 |
Keylock |
JP3 |
Power LED |
JP5 pins 3 & 4 |
Reset switch |
JP4 |
Turbo switch |
JP6 |
USER CONFIGURABLE SETTINGS | |||
Function |
Label |
Position | |
» |
Factory configured - do not alter |
SW1/1 |
Off |
» |
NPU not installed |
SW1/2 |
On |
NPU installed |
SW1/2 |
Off | |
» |
Factory configured - do not alter |
SW1/3 |
Off |
» |
Factory configured - do not alter |
SW1/4 |
Off |
DRAM CONFIGURATION | ||||||
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 2A |
Bank 3 |
Bank 3A |
256KB |
(9) 41256 |
None |
None |
None |
None |
None |
512KB |
(9) 41256 |
(9) 41256 |
None |
None |
None |
None |
576KB |
(9) 41256 |
(9) 41256 |
(2) 4464 |
(1) 4164 |
None |
None |
640KB |
(9) 41256 |
(9) 41256 |
(2) 4464 |
(1) 4164 |
(2) 4464 |
(1) 4164 |
FLOPPY DRIVE SELECTION | ||
Drives installed |
SW1/7 |
SW1/8 |
1 |
On |
On |
2 |
Off |
On |
3 |
On |
Off |
4 |
Off |
Off |
MONITOR SELECTION | ||
Type |
SW1/5 |
SW1/6 |
None |
On |
On |
Color (40 x 20) |
Off |
On |
Color (80 x 25) |
On |
Off |
Monochrome |
Off |
Off |
TURBO SELECTION | ||
Type |
JP7 |
JP8 |
Always in turbo mode |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
Turbo select through software |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
Turbo select through software & keyboard |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Note: To toggle between normal and turbo modes, press CTRL, ALT, + to enable turbo and CTRL, ALT, - to disable turbo. |