80486 MOTHERBOARD Motherboard Settings and Configuration
UNIDENTIFIED
80486 MOTHERBOARD
Processor | CX486S/80486SX/80487SX/80486DX/80486DX2/80486DX4 |
Processor Speed | 25/33/40/50/50i/66i/75i/100iMHz |
Chip Set | Unidentified |
Max. Onboard DRAM | 64MB |
Cache | 64/128/256KB |
BIOS | AMI |
Dimensions | 250mm x 220mm |
I/O Options | 32-bit VESA local bus slots (3) |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
CPU power board | J10 | Turbo LED | JP18 |
External battery | JP1 | Reset switch | JP19 |
Power LED & Keylock | JP16 | Turbo switch | JP20 |
Speaker | JP17 | 32-bit VESA local bus slots | SL1-SL3 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | VL-bus card select general | JP2 | pins 1 & 2 closed |
| VL-bus card select Power 9000 | JP2 | pins 2 & 3 closed |
» | Factory configured - do not alter | JP3 | N/A |
» | 80486DX4 power board voltage select 3.45 | JP4 | Open |
| 80486DX4 power board voltage select 5 | JP4 | Closed |
» | 80486DX4 clock speed select tripled | JP28 | Closed |
| 80486DX4 clock speed select doubled | JP28 | 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) 1M x 9 | 256K |
8MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
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 (U28) | Tag (U29) |
64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | NONE |
128KB | (4) 32K x 8 | NONE | (1) 8K x 8 | NONE |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 8K x 8 or (1) 32K x 8 | (1) 8K x 8 or NONE |
CACHE JUMPER CONFIGURATION | ||||
Size | JP9 | JP10 | JP11 | JP12 |
64KB | pins 1 & 2 closed | Open | Open | Open |
128KB | pins 2 & 3 closed | pins 2 & 3 closed | Closed | Open |
256KB | pins 1 & 2 closed | pins 1 & 2 closed | Closed | Closed |
CPU CLOCK SPEED CONFIGURATION (MX8310) | |||
Speed | JP13 | JP14 | JP15 |
25MHz | Closed | Open | Open |
33MHz | Closed | Closed | Closed |
40MHz | Closed | Closed | Open |
50MHz | Open | Open | Closed |
50i MHz | Closed | Open | Open |
66i MHz | Closed | Closed | Closed |
75i MHz | Closed | Open | Open |
100i MHz | Open | Open | Closed |
CPU CLOCK SPEED CONFIGURATION (KTS0802C/PLL52C05) | |||
Speed | JP13 | JP14 | JP15 |
25MHz | Closed | Closed | Open |
33MHz | Open | Closed | Open |
40MHz | Closed | Open | Closed |
50MHz | Closed | Open | Open |
50i MHz | Closed | Closed | Open |
66i MHz | Open | Closed | Open |
75i MHz | Closed | Closed | Open |
100i MHz | Closed | Open | Open |
CPU TYPE SELECT | |||
Type | JP5-JP8 | JP22 | JP23 |
CX 486S | Closed | pins 2 & 3 closed | Open |
80486SX | Closed | pins 2 & 3 closed | Open |
80487SX | Closed | pins 1 & 2,3 & 4 closed | pins 2 & 3 closed |
486DX/DX2 | Closed | pins 1 & 2,3 & 4 closed | pins 1 & 2 closed |
80486DX4 | Open | pins 1 & 2,3 & 4 closed | pins 1 & 2 closed |
Note: Using 80486DX4, CPU power board (optional) must be in J10. | |||
VESA BUS SPEED CONFIGURATION | |
Speed | JP21 |
25MHz | Open |
33MHz | Open |
40MHz | Open |
50MHz | Closed |
50i MHz | Open |
66i MHz | Open |
75i MHz | Open |
100i MHz | Closed |
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