MICRONICS COMPUTERS, INC.
MINI 486 SYSTEM BOARD
|
Processor |
80486SX/80486DX/ODP486SX/80486DX2 |
|
Processor Speed |
25/33/50(internal)/50/66(internal)MHz |
|
Chip Set |
Micronics |
|
Max. Onboard DRAM |
64MB |
|
Cache |
64/128/256KB |
|
BIOS |
Phoenix |
|
Dimensions |
230mm x 218mm |
|
I/O Options |
None |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External keyboard connector |
J1 |
Turbo switch |
W16 |
|
Speaker |
J20 |
Turbo LED |
W17 |
|
Reset switch |
W15 |
Power LED & keylock |
W18 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
Monitor type select color |
W2 |
Closed |
|
Monitor type select monochrome |
W2 |
Open | |
|
|
Real Time Clock enabled |
W3 |
pins 1 & 2 closed |
|
External battery enabled |
W3 |
pins 2 & 3 closed | |
|
|
Factory configured - do not alter |
W43 |
pins 1 & 2 closed |
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
1MB |
(1) 256K x 36 |
NONE |
NONE |
NONE |
|
2MB |
(1) 256K x 36 |
(1) 256K x 36 |
NONE |
NONE |
|
4MB |
(1) 1M x 36 |
NONE |
NONE |
NONE |
|
6MB |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 1M x 36 |
NONE |
|
8MB |
(1) 1M x 36 |
(1) 1M x 36 |
NONE |
NONE |
|
10MB |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
12MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
NONE |
|
16MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
16MB |
(1) 4M x 36 |
NONE |
NONE |
NONE |
|
18MB |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 4M x 36 |
NONE |
|
20MB |
(1) 1M x 36 |
(1) 4M x 36 |
NONE |
NONE |
|
24MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 4M x 36 |
NONE |
|
32MB |
(1) 4M x 36 |
(1) 4M x 36 |
NONE |
NONE |
|
36MB |
(1) 1M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
NONE |
|
40MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
|
48MB |
(1) 4M x 36 |
(1) 4M x 9 |
(1) 4M x 36 |
NONE |
|
64MB |
(1) 4M x 36 |
(1) 4M x 9 |
(1) 4M x 36 |
(1) 4M x 36 |
|
CACHE CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
TAG/U41 |
TAG/U42 |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(1) 8K x 8 |
N/A |
|
128KB |
(4) 32K x 8 |
NONE |
(1) 32K x 8 |
N/A |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 32K x 8 |
N/A |
|
Note:Tag/U42 is not currently in use. | ||||
|
CACHE JUMPER CONFIGURATION | |||||||||
|
Size |
W5 |
W6 |
W7 |
W8 |
W9 |
W10 |
W11 |
W12 |
W13 |
|
64KB |
2 & 3 |
1 & 2 |
1 & 2 |
2 & 3 |
1 & 2 |
1 & 2 |
1 & 2 |
2 & 3 |
2 & 3 |
|
128KB |
2 & 3 |
2 & 3 |
1 & 2 |
2 & 3 |
2 & 3 |
1 & 2 |
2 & 3 |
1 & 2 |
1 & 2 |
|
256KB |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
|
Note:Pins designated should be in the closed position. | |||||||||
|
CPU TYPE CONFIGURATION | ||
|
Type |
W14 |
W19 |
|
80486SX |
N/A |
pins 1 & 2 closed |
|
80486DX |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
ODP486SX |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
80486DX2 |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
CPU SPEED CONFIGURATION | ||
|
Speed |
W21 |
W22 |
|
25MHz |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
33MHz |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
50i MHz |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
50MHz |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
66i MHz |
pins 1 & 2 closed |
pins 2 & 3 closed |