MICRONICS COMPUTERS, INC.
486DX2/50 SYSTEM BOARD
|
Processor |
80486DX2 |
|
Processor Speed |
50(internal)MHz |
|
Chip Set |
Micronics |
|
Max. Onboard DRAM |
64MB (32MB on external memory board) |
|
Cache |
64/256KB |
|
BIOS |
AMI |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
32-bit external memory card |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External battery |
J11 |
Turbo LED |
W5 |
|
Speaker |
J23 |
Reset switch |
W6 |
|
Power LED & keylock |
J24 |
Turbo switch |
W7 |
|
External keyboard connector |
W1 |
32-bit external memory card |
SL1 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Switch |
Position | |
|
» |
Factory configured - do not alter |
SW1/1 |
On |
|
» |
Factory configured - do not alter |
SW1/2 |
Off |
|
» |
Factory configured - do not alter |
SW1/3 |
Off |
|
» |
I/O delay enabled |
SW1/4 |
Off |
|
I/O delay disabled |
SW1/4 |
On | |
|
» |
Factory configured - do not alter |
SW1/5 |
Off |
|
» |
Video BIOS cache enabled |
SW1/6 |
Off |
|
Video BIOS cache disabled |
SW1/6 |
On | |
|
» |
Factory configured - do not alter |
SW1/7 |
Off |
|
» |
Factory configured - do not alter |
SW1/8 |
Off |
|
» |
Factory configured - do not alter |
SW2/6 |
On |
|
» |
Cache enabled |
SW2/7 |
Off |
|
Cache disabled |
SW2/7 |
On | |
|
» |
Cache enabled |
SW2/8 |
Off |
|
Cache disabled |
SW2/8 |
On | |
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
1MB |
(4) 256K x 9 |
NONE |
NONE |
NONE |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
NONE |
NONE |
|
3MB |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
NONE |
|
4MB |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
|
4MB |
(4) 1M x 9 |
NONE |
NONE |
NONE |
|
5MB |
(4) 256K x 9 |
(4) 1M x 9 |
NONE |
NONE |
|
6MB |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 1M x 9 |
NONE |
|
7MB |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 1M x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
NONE |
NONE |
|
9MB |
(4) 256K x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
NONE |
|
10MB |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
|
12MB |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
NONE |
|
13MB |
(4) 256K x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
NONE |
NONE |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
NONE |
NONE |
|
24MB |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 4M x 9 |
NONE |
|
28MB |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 4M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
NONE |
NONE |
|
36MB |
(4) 1M x 9 |
(4) 4M x 9 |
(4) 4M x 9 |
NONE |
|
40MB |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 4M x 9 |
(4) 4M x 9 |
|
48MB |
(4) 4M x 9 |
(4) 4M x 9 |
(4) 4M x 9 |
NONE |
|
52MB |
(4) 1M x 9 |
(4) 4M x 9 |
(4) 4M x 9 |
(4) 4M x 9 |
|
64MB |
(4) 4M x 9 |
(4) 4M x 9 |
(4) 4M x 9 |
(4) 4M x 9 |
|
Note: Banks 2 & 3 are located on the external memory card. | ||||
|
DRAM SWITCH CONFIGURATION | |||||
|
Size |
SW2/1 |
SW2/2 |
SW2/3 |
SW2/4 |
SW2/5 |
|
1MB |
On |
On |
On |
On |
On |
|
2MB |
Off |
On |
On |
On |
On |
|
3MB |
On |
Off |
On |
On |
On |
|
4MB |
Off |
Off |
On |
On |
On |
|
4MB |
On |
On |
Off |
On |
On |
|
5MB |
On |
On |
Off |
Off |
On |
|
6MB |
On |
Off |
On |
Off |
On |
|
7MB |
Off |
On |
On |
Off |
On |
|
8MB |
Off |
On |
Off |
On |
On |
|
9MB |
On |
Off |
Off |
Off |
On |
|
10MB |
Off |
Off |
On |
Off |
On |
|
12MB |
On |
Off |
Off |
On |
Off |
|
13MB |
Off |
Off |
Off |
Off |
On |
|
16MB |
Off |
Off |
Off |
On |
On |
|
16MB |
On |
On |
Off |
On |
Off |
|
20MB |
On |
On |
Off |
Off |
Off |
|
24MB |
On |
Off |
On |
Off |
Off |
|
28MB |
Off |
On |
On |
Off |
Off |
|
32MB |
Off |
On |
Off |
On |
Off |
|
36MB |
On |
Off |
Off |
Off |
Off |
|
40MB |
Off |
Off |
On |
Off |
Off |
|
48MB |
On |
Off |
Off |
On |
Off |
|
52MB |
Off |
Off |
Off |
Off |
Off |
|
64MB |
Off |
Off |
Off |
On |
Off |
|
CACHE CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | |||
|
Size |
W3 |
W4 |
W15 |
|
64KB |
Open |
Open |
pins 2 & 3 closed |
|
256KB |
Closed |
Closed |
pins 1 & 2 closed |