UNIDENTIFIED
786 ACIO VESA MOTHERBOARD
Processor | 80386DX/CX486DLC/80486SX/80486DX/80486DX2 |
Processor Speed | 25/33/40/50(internal)/50/66(internal)MHz |
Chip Set | Unknown |
Max. Onboard DRAM | 32MB |
Cache | 64/128/256KB |
BIOS | Unknown |
Dimensions | 254mm x 218mm |
I/O Options | 32-bit VESA local bus slots (2) |
NPU Options | 80387DX |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Power LED & keylock | J2 | External battery | J7 |
Turbo switch | J4 | Speaker | J100 |
Turbo LED | J5 | 32-bit VESA Local bus slot | S1 |
Reset switch | J6 | 32-bit VESA Local bus slot | S2 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Monitor type select color | J3 | Closed |
Monitor type select monochrome | J3 | Open | |
» | CMOS memory normal operation (Internal battery) | JMP3 | pins 2 & 3 closed |
» | CMOS memory normal operation (External battery) | JMP3 | pins 1 & 2 closed |
CMOS memory clear | JMP3 | pins 2 & 4 closed | |
» | NPU enabled | JMP4 | pins 1 & 2 closed |
NPU disabled | JMP4 | pins 2 & 3 closed | |
» | Factory configured - do not alter | JMP6 | pins 1 & 4 closed |
» | VESA local bus enabled | JMP10 | Open |
VESA local bus disabled | JMP10 | Closed |
DRAM CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
1MB | (4) 256K x 9 | NONE |
2MB | (4) 256K x 9 | (4) 256K x 9 |
4MB | (4) 1M x 9 | NONE |
5MB | (4) 1M x 9 | (4) 256K x 9 |
8MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
32MB | (4) 4M x 9 | (4) 4M x 9 |
Note:The exact locations of Bank 0 & Bank 1 is unknown. |
CACHE CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | TAG/U26 | TAG/U27 |
64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | (1) 8K x 8 |
128KB | (4) 32K x 8 | NONE | (1) 8K x 8 | (1) 8K x 8 |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 | (1) 32K x 8 |
Note:The exact locations of Bank 0 & Bank 1 is unknown. |
CACHE JUMPER CONFIGURATION | ||||
Size | JMP1A | JMP1B | JMP1C | JMP8 |
64KB | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 and 4 & 5 |
128KB | pins 2 & 3 closed | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 and 4 & 5 |
256KB | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 and 5 & 6 |
Note:Pins designated should be in the closed position. The exact locations of Banks 0 & Bank 1 is unknown. |
CPU TYPE CONFIGURATION | |||||
Type | JMP2 | JMP5 | JMP7 | JMP12 | JMP13 |
80386DX | Open | Closed | Open | Open | pins 2 & 3 and 5 & 6 |
CX486DLC | Open | Open | Closed | Closed | pins 1 & 2 and 4 & 5 |
80486SX | pins 1 & 2 closed | Open | Closed | Closed | pins 1 & 2 and 4 & 5 |
80486DX | pins 2 & 3 closed | Open | Closed | Closed | pins 1 & 2 and 4 & 5 |
80486DX2 | pins 2 & 3 closed | Open | Closed | Closed | pins 1 & 2 and 4 & 5 |
Note:Pins designated should be in the closed position. |
CPU SPEED CONFIGURATION | ||
Speed | JMP9 | JMP14 |
80386DX/25MHz | pins 1 & 5 and 2 & 6 closed | pins 1 & 2 closed |
80386DX/33MHz | pins 1 & 5 and 4 & 8 closed | pins 1 & 2 closed |
80386DX/40MHz | 1 & 5, 3 & 7 and 4 & 8 closed | pins 1 & 2 closed |
80486SX/50MHz | pins 3 & 7 closed | pins 2 & 3 closed |
80486DX/25MHz | pins 2 & 6 closed | pins 1 & 2 closed |
80486DX/33MHz | pins 4 & 8 closed | pins 1 & 2 closed |
80486DX2/50i MHz | pins 2 & 6 closed | pins 2 & 3 closed |
80486DX2/66i MHz | pins 4 & 8 closed | pins 1 & 2 closed |