UNIDENTIFIED
U486
Processor | 80486SX/80487SX/80486DX |
Processor Speed | 33/50MHz |
Chip Set | UMC |
Video Chip Set | None |
Maximum Onboard Memory | 32MB |
Maximum Video Memory | None |
Cache | 64/128/256KB |
BIOS | AMI |
Dimensions | 254mm x 218mm |
I/O Options | None |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J3 | Turbo switch | J10 |
Speaker | J8 | Turbo LED | J11 |
Power LED & keylock | J9 | Reset switch | J12 |
USER CONFIGURABLE SETTINGS | |||
Function | Label | Position | |
» | Battery type select internal | J1 | Closed |
Battery type select external | J1 | Open | |
» | Keyboard clock select synchronous | J5 | Pins 2 & 3 closed |
Keyboard clock select asynchronous | J5 | Pins 1 & 2 closed | |
» | Monitor type select color | J6 | Closed |
Monitor type select monochrome | J6 | Open | |
» | CMOS memory normal operation | J13 | Pins 1 & 2 closed |
CMOS memory clear | J13 | Pins 2 & 3 closed | |
» | Turbo sped disabled | JP1 | Closed |
Turbo speed enabled | JP1 | 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 |
20MB | (4) 1M x 9 | (4) 4M x 9 |
32MB | (4) 4M x 9 | (4) 4M x 9 |
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 |
Note: The location of banks 0 & 1 are unidentified. |
CACHE JUMPER CONFIGURATION | ||||||||
Size | W1 | W2 | W3 | W5 | W6 | W7 | W8 | W9 |
64KB | 1 & 2 | Open | 1 & 2 | 1 & 2 | Open | Open | Open | Open |
128KB | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 | Closed | Open | Open | Closed |
256KB | 1 & 2 | 2 & 3 | 2 & 3 | 2 & 3 | Closed | Closed | Closed | Closed |
Note: Pins designated should be in the closed position. |
CPU CLOCK MODE SELECTION | |
Speed | W10 |
1x | Open |
2x | Closed |
CPU TYPE SELECTION | ||
Type | W11 | W12 |
80486SX | Pins 2 & 3 closed | Open |
80487SX | Pins 1 & 2, 3 & 4 closed | Pins 2 & 3 closed |
80486DX | Pins 1 & 2, 3 & 4 closed | Pins 1 & 2 closed |