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 |