LEADING EDGE PRODUCTS, INC.
MODEL D (REVISION 7)
Processor | 8088 (exact location unknown) |
Processor Speed | 4.77MHz |
Chip Set | Unknown |
Max. Onboard DRAM | 768KB |
Cache | None |
BIOS | Unknown |
Dimensions | 254mm x 218mm |
I/O Options | Color monitor port, floppy drive interface, light pen connector, monochrome monitor port, parallel port, serial port |
NPU Options | 8087 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Parallel port | J6 | Floppy drive interface | J15 |
Serial port | J7 | Keyboard | J18 |
Color monitor port | J8 | Speaker | J19 |
Monochrome port | J9 | Reset switch | J20 |
Light pen connector | J11 | Power-on LED indicator | J21 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Factory configured - do not alter | J5 | N/A |
» | Monitor enabled | J10 | Closed |
Monitor disabled | J10 | Open | |
» | Floppy drive interface enabled | J13 | pins 4 & 9 closed |
Floppy drive interface disabled | J13 | pins 4 & 9 open | |
» | Serial port enabled | J13 | pins 5 & 10 closed |
Serial port disabled | J13 | pins 5 & 10 open | |
» | Parallel port enabled | J13 | pins 3 & 8 closed |
Parallel port disabled | J13 | pins 3 & 8 open | |
» | Real Time Clock enabled | J13 | pins 2 & 7 closed |
Real Time Clock disabled | J13 | pins 2 & 7 open | |
» | Factory configured - do not alter | J13 | pins 1 & 6 open |
» | BIOS ROM type 8/16K | J16 | Open |
BIOS ROM type 32K | J16 | Closed | |
» | Video mode TTL mononchrome | SW1 | Up |
Video mode CGA | SW1 | Down | |
» | Factory configured - do not alter | SW2/switch 1 | Off |
» | NPU disabled | SW2/switch 2 | On |
NPU enabled | SW2/switch 2 | Off | |
» | Factory configured - do not alter | SW2/switch 3 | On |
» | Memory test 64KB | SW2/switch 4 | On |
Memory test all | SW2/switch 4 | Off | |
» | Factory configured - do not alter | SW2/switch 5 | Off |
» | Factory configured - do not alter | SW2/switch 6 | Off |
Note:The exact location of J5 is unknown. |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | J23 |
512KB | (9) 41256 | (9) 41256 | NONE | pins 1 & 2 closed |
768KB | (9) 41256 | (9) 41256 | (9) 41256 | pins 3 & 4 closed |
Note:Even though this system has 768KB installed, only 640KB is available to the user. |
FLOPPY DISK DRIVES INSTALLED | ||
Number of Drives | SW2/switch 7 | SW2/switch 8 |
1 | On | On |
2 | Off | On |
3 | On | Off |
4 | Off | Off |
REAL TIME CLOCK INTERRUPT SELECT | |
IRQ | J12 |
2 | pins 1 & 5 closed |
4 | pins 2 & 6 closed |
5 | pins 3 & 7 closed |
7 | pins 4 & 8 closed |