486SX/486DX/486DX2 (VER. 2) Motherboard Settings and Configuration
MAGITRONICS
486SX/486DX/486DX2 (VER. 2)
Processor | 80486SX/80486DX/80486DX2/Pentium Overdrive |
Processor Speed | 25/33/40/50(internal)/50/66(internal)MHz |
Chip Set | Unidentified |
Max. Onboard DRAM | 64MB |
Cache | 64/128/256KB |
BIOS | AMI |
Dimensions | 254mm x 220mm |
I/O Options | 32-bit VESA local bus slots (3) |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J1 | Speaker | JP16 |
Power LED & keylock | J21 | Reset switch | S1 |
Turbo LED | JP12 | 32-bit VESA local bus slots | SL1 - SL3 |
Turbo switch | JP13 | ||
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | CMOS memory normal operation | JP1 | pins 2 & 3 closed |
CMOS memory clear | JP1 | pins 1 & 2 closed | |
» | Monitor type select color | JP2 | Closed |
Monitor type select monochrome | JP2 | Open | |
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) 16K x 8 or (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | ||||
Size | JP3 | JP5 | JP8 | JP9 |
64KB | pins 2 & 3 closed | pins 2 & 3 closed | Open | Open |
128KB | pins 1 & 2 closed | pins 1 & 2 closed | Closed | Open |
256KB | pins 2 & 3 closed | pins 2 & 3 closed | Closed | Closed |
CPU TYPE CONFIGURATION | |||
Type | JP6 | JP7 | JP11 |
80486SX | pins 2 & 3 closed | pins 2 & 3 closed | Open |
80486DX/DX2 | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
CPU SPEED CONFIGURATION | |||
Speed | JP18 | JP19 | JP20 |
25MHz | Closed | Open | Closed |
33MHz | Closed | Closed | Open |
40MHz | Open | Open | Closed |
50iMHz | Closed | Open | Closed |
50MHz | Open | Closed | Open |
66iMHz | Closed | Closed | Open |
CPU ADS DELAY CONFIGURATION | |
Speed | JP21 |
33MHz | pins 2 & 3 closed |
40MHz | pins 1 & 2 closed |
50MHz | pins 1 & 2 closed |
66iMHz | pins 2 & 3 closed |
VESA WAIT STATE CONFIGURATION | |
Wait states | JP17 |
0 wait states | Open |
1 wait state | Closed |
Note: The location of JP17 is unknown. | |
BUS SPEED CONFIGURATION | |
CPU speed | JP14 |
<= 33MHz | Open |
> 33MHz | Closed |
Note: The location of JP14 is unknown. | |
MISCELLANEOUS TECHNICAL NOTE |
Note:The location of jumpers on diagram are for identification purposes and may not be the actual location. |
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