UNIDENTIFIED
TURBO MAINBOARD
|
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 |
|
Operating mode interface |
P3 |
Keyboard connector |
P5 |
|
Speaker |
P4 |
Reset switch |
SW2 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
I/O address is C0H (bit 0 low = turbo mode; high = normal mode) |
E1 |
Pins 1 & 2 closed | |
|
I/O address is 061H (bit 2 low = turbo mode; high = normal mode) |
E1 |
Pins 2 & 3 closed | |
|
CPU changes speed during disk drive access |
E6 |
Closed | |
|
CPU does not change speed during disk drive access |
E6 |
Open | |
|
Boot memory test enabled |
SW1/1 |
On | |
|
Boot memory test disabled |
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 |
|
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 |
|
512KB |
(9) 41256 |
(9) 41256 |
None |
None |
|
576KB |
(9) 41256 |
(9) 41256 |
(9) 4164 |
None |
|
640KB |
(9) 41256 |
(9) 41256 |
(9) 4164 |
(9) 4164 |
|
DRAM JUMPER/SWITCH CONFIGURATION | |||
|
Size |
E4 |
SW1/3 |
SW1/4 |
|
64KB |
Open |
On |
On |
|
128KB |
Open |
Off |
On |
|
192KB |
Open |
On |
Off |
|
256KB |
Open |
Off |
Off |
|
256KB |
Closed |
On |
On |
|
512KB |
Closed |
Off |
On |
|
576KB |
Closed |
On |
Off |
|
640KB |
Closed |
Off |
Off |
|
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 |
|
None |
On |
On |
|
Color (80 x 25) |
On |
Off |
|
Color (40 x 25) |
Off |
On |
|
Monochrome |
Off |
Off |
|
ROM SELECTION | |||
|
U25 address |
U26 address |
E2 |
E3 |
|
F6000H - FDFFFH |
FE000H - FFFFFH |
Closed |
Closed |
|
F4000H - FBFFFH |
FC0000H - FFFFFH |
Closed |
Open |
|
F0000H - F7FFFH |
F8000H - FFFFFH |
Open |
Open |