M280 Motherboard Settings and Configuration
OLIVETTI
M280
Processor | 80286 |
Processor Speed | 12MHz |
Chip Set | Unidentified |
Max. Onboard DRAM | 1MB |
Cache | None |
BIOS | Unidentified |
Dimensions | 355mm x 304mm |
I/O Options | Floppy drive interface, parallel port, serial port |
NPU Options | 80287 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Parallel port | CN1 | Floppy drive interface | CN3 |
Serial port | CN2 | ||
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Memory size select 1MB | JU1 pins 1 & 9 | Open |
Memory size select 512KB | JU1 pins 1 & 9 | Closed | |
» | Parallel port enabled | JU1 pins 6 & 14 | Closed |
Parallel port disabled | JU1 pins 6 & 14 | Open | |
» | Serial port enabled | JU1 pins 7 & 15 | Closed |
Serial port disabled | JU1 pins 7 & 15 | Open | |
» | Factory configured - do not alter | JU1 pins 8 & 16 | Open |
» | System clock source select 24MHz on board clock | JU2 pins 7 & 15 | Open |
System clock source select external clock | JU2 pins 7 & 15 | Closed | |
» | NPU wait state select 3 wait states | JU2 pins 8 & 16 | Closed |
NPU wait state select 10 wait states | JU2 pins 8 & 16 | Open | |
» | Burn in enabled | JU3 pins 1 & 5 | Open |
Burn in disabled | JU3 pins 1 & 5 | Closed | |
» | Monitor type select color/Olivetti monochrome | JU3 pins 2 & 6 | Closed |
Monitor type select monochrome | JU3 pins 2 & 6 | Open | |
» | 32KHz clock enabled | JU3 pins 3 & 7 | Closed |
32KHz clock disabled | JU3 pins 3 & 7 | Open | |
» | Factory configured - do not alter | JU3 pins 4 & 8 | Open |
» | 14MHz clock enabled | JU4 | Closed |
14MHz clock disabled | JU4 | Open | |
» | 1.8MHz clock enabled | JU5 | Closed |
1.8MHz clock disabled | JU5 | Open | |
» | Factory configured - do not alter | JU8 | Closed |
» | Factory configured - do not alter | JU9 | Closed |
Note: The locations of JU4, JU5, JU8 & JU9 are unidentified. | |||
DRAM CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
512KB | (18) 41256 | NONE |
1MB | (18) 41256 | (18) 41256 |
CPU SPEED CONFIGURATION | ||
Speed | JU6 | JU7 |
8MHz | Open | Closed |
12MHz | Closed | Open |
Note: The locations of JU6 & JU7 aare unidentified. | ||
NPU SPEED CONFIGURATION | ||||
Speed | JU2 pins 1 & 9 | JU2 pins 2 & 10 | JU2 pins 3 & 11 | JU2 pins 4 & 12 |
8MHz | Open | Open | Open | Open |
12MHz | Closed | Closed | Closed | Closed |
NPU SPEED CONFIGURATION (CON’T) | |||
Speed | JU10 | JU11 | JU12 |
8MHz | Open | Open | Open |
12MHz | Closed | Closed | Closed |
Note: The locations of JU10, JU11 & JU12 aare unidentified. | |||
BIOS CONFIGURATION | ||||
Type | JU1 pins 2 & 10 | JU1 pins 3 & 11 | JU1 pins 4 & 12 | JU1 pins 5 & 13 |
27128 | Closed | Open | Closed | Open |
27256 | Open | Closed | Open | Closed |
SCROLL MODE CONFIGURATION | ||
Setting | JU2 pins 5 & 13 | JU2 pins 6 & 14 |
Fast scroll | Open | Open |
Flicker scroll | Closed | Closed |
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