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 |