UNIDENTIFIED
OPTI495SLC VL-BUS 3/486
Processor | 80386DX/CX486DLC/80486SX/80487DX/80486DX/80486DX2 |
Processor Speed | 25/33/40/50(internal)/50/66(internal)MHz |
Chip Set | OPTI |
Max. Onboard DRAM | 64MB |
Cache | 64/128/256KB |
BIOS | AMI |
Dimensions | 230mm x 218mm |
I/O Options | 32-bit VESA local bus slots (2) |
NPU Options | 80387DX |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Turbo switch | J1 | Reset switch | J5 |
Power LED & keylock | J2 | External battery | J6 |
Speaker | J3 | 32-bit VESA Local bus slots | SL1 & SL2 |
Turbo LED | J4 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Turbo mode enabled | J1 | Open |
Turbo mode disabled | J1 | Closed | |
» | CMOS memory normal operation (Internal Battery) | J6 | pins 2 & 3 closed |
CMOS memory clear | J6 | pins 3 & 4 closed | |
» | Factory configured - do not alter | JP7 | N/A |
» | Factory configured - do not alter | JP9 | N/A |
» | Cyrix PQFP disabled | JP10 | Closed |
Cyrix PQFP enabled | JP10 | Open | |
» | 80386DX/80486SX PQFP disabled | JP16 | Closed |
80386DX/80486SX PQFP enabled | JP16 | Open | |
» | Monitor type select monochrome | JP21 | Open |
Monitor type select color | JP21 | Closed | |
» | Battery type select NI-CD recharge | JP29 | pins 2 & 3 closed |
Battery type select Lithum discharge | JP29 | pins 1 & 2 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) 256K x 9 | (4) 1M x 9 |
8MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
17MB | (4) 256K x 9 | (4) 4M x 9 |
20MB | (4) 1M x 9 | (4) 4M x 9 |
20MB | (4) 4M x 9 | (4) 1M x 9 |
32MB | (4) 4M x 9 | (4) 4M x 9 |
64MB | (4) 16M x 9 | NONE |
CACHE CONFIGURATION | |||
Size | Bank 0 | Bank 1 | TAG |
64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | |||||||
Size | JP13 | JP17 | JP18 | JP20 | JP24 | JP27 | JP28 |
64KB | Open | Open | 2 & 3 | 1 & 2 | Open | Open | Open |
128KB | Open | Closed | 1 & 2 | 2 & 3 | Open | Open | Open |
256KB | Closed | Closed | 2 & 3 | 1 & 2 | Open | Open | Open |
Note: Pins designated should be in the closed position. |
CPU TYPE CONFIGURATION | |||
CPU Type | JP12 | JP14 | JP15 |
80386 | pins 1 & 2 closed | pins 1 & 2 closed | Open |
80486 | pins 2 & 3 closed | pins 2 & 3 closed | Closed |
CPU TYPE CONFIGURATION (80486) | |||
Type | JP5 | JP6 | JP19 |
80486SX | Open | Open | pins 2 & 3 closed |
80487SX | pins 2 & 3 closed | Closed | pins 1 & 2 closed |
80486DX/DX2 | pins 1 & 2 closed | Closed | pins 1 & 2 closed |
Overdrive | pins 2 & 3 closed | Closed | pins 1 & 2 closed |
CPU SPEED CONFIGURATION (80386DX & CX486DLC) | |||||
Speed | JP1 | JP2 | JP3 | JP4 | JP22 |
33MHz | Closed | Open | Closed | 2 & 3 | Open |
40MHz | Closed | Closed | Closed | 2 & 3 | Open |
Note: Pins designated should be in the closed position. |
CPU SPEED CONFIGURATION (80486) | |||||
Speed | JP1 | JP2 | JP3 | JP4 | JP22 |
25MHz | Open | Open | Open | 1 & 2 | Closed |
33MHz | Open | Closed | Open | 1 & 2 | Open |
40MHz | Closed | Closed | Open | 1 & 2 | Open |
50iMHz | Open | Open | Open | 1 & 2 | Closed |
50MHz | Closed | Open | Open | 1 & 2 | Open |
66iMHz | Open | Closed | Open | 1 & 2 | Open |
Note: Pins designated should be in the closed position. |
VESA CARD CONFIGURATION | |
Card Type | JP23 |
Use standard VESA card with (all CPU’s) | pins 1 & 2 closed |
Use DC-680DT VGA, Tekram VESA cache IDE or other special card (486DX-50 only) | pins 2 & 3 closed |