UNIDENTIFIED
U486 (ML-U486DX50/33HS/V1)
|
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 LED |
J11 |
|
Speaker |
J8 |
Reset switch |
J12 |
|
Power LED & keylock |
J9 |
Turbo switch |
JP1 |
|
Turbo switch |
J10 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
|
Battery type select internal |
J1 |
Closed |
|
Battery type select external |
J1 |
Open | |
|
|
NPU synchronous with CPU |
J5 |
Pins 2 & 3 closed |
|
NPU asynchronous with CPU |
J5 |
Pins 1 & 2 closed | |
|
|
Monitor type select color |
J6 |
Closed |
|
Monitor type select monochrome |
J6 |
Open | |
|
|
Factory configured - do not alter |
J7 |
Unidentified |
|
|
CMOS memory normal operation |
J13 |
Pins 1 & 2 closed |
|
CMOS memory clear |
J13 |
Pins 2 & 3 closed | |
|
|
Factory configured - do not alter |
W4 |
Unidentified |
|
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 (33MHZ CPU) | |||
|
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. The speed for the cache is 15ns and 25ns for the TAG. | |||
|
CACHE CONFIGURATION (50MHZ CPU) | |||
|
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. The speed for the cache is 15ns and 20ns for the TAG. | |||
|
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 SELECTION | |
|
Setting |
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 |
|
TURBO SELECTION | ||
|
Setting |
J10 |
JP1 |
|
Enabled |
Closed |
Open |
|
Disabled |
Open |
Closed |