MICRONICS COMPUTERS, INC.
80486 ASIC EISA SYSTEM BOARD
|
Processor |
80486DX/80486DX2 |
|
Processor Speed |
33/50(internal)MHz |
|
Chip Set |
Intel |
|
Max. Onboard DRAM |
64MB |
|
Cache |
64/256KB |
|
BIOS |
Phoenix |
|
Dimensions |
355mm x 304mm |
|
I/O Options |
32-bit local bus slot, floppy drive interface, parallel port, serial ports (2) |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External keyboard connector |
J1 |
Speaker |
J22 |
|
Parallel port |
J4 |
Power LED & keylock |
J23 |
|
Serial port 1 |
J5 |
32-bit Local bus slot |
S1 |
|
Serial port 2 |
J15 |
Reset switch |
W5 |
|
Floppy drive interface |
J17 |
Turbo switch |
W6 |
|
External battery |
J17A |
Turbo LED |
W7 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper/Switch |
Position | |
|
» |
Factory configured - do not alter |
SW1/6 |
On |
|
» |
Factory configured - do not alter |
SW1/7 |
Off |
|
» |
Monitor type select color |
SW1/8 |
On |
|
Monitor type select monochrome |
SW1/8 |
Off | |
|
» |
Factory configured - do not alter |
W11 |
pins 2 & 3 closed |
|
» |
Factory configured - do not alter |
W12 |
pins 1 & 2 closed |
|
» |
Floppy drive interface enabled |
W13 |
pins 1 & 2 closed |
|
Floppy drive interface disabled |
W13 |
pins 2 & 3 closed | |
|
» |
CPU select 486DX2/50MHz |
W43 |
pins 1 & 2 closed |
|
CPU select 486DX/33MHz |
W43 |
Open | |
|
» |
Factory configured - do not alter |
W45 |
pins 1 & 2 closed |
|
PARALLEL PORT CONFIGURATION | ||||
|
I/O Address |
Port |
W3 |
W4 |
W10 |
|
3BC-3BEh |
LPT1 |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
378-37Ah |
LPT2 |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
278-27Ah |
LPT3 |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
N/A |
Disabled |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
SERIAL PORT CONFIGURATION | ||||
|
Port 1 |
Port 2 |
W2 |
W8 |
W9 |
|
COM1 |
COM2 |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
COM1 |
Disabled |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
Disabled |
COM2 |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
Disabled |
Disabled |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
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 |
(4)1M x 9 |
|
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 |
|
DRAM SWITCH CONFIGURATION | |||||
|
Size |
SW1/switch 1 |
SW1/switch 2 |
SW1/switch 3 |
SW1/switch 4 |
SW1/switch 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 |
On |
|
13MB |
Off |
Off |
Off |
Off |
On |
|
16MB |
On |
On |
Off |
On |
On |
|
16MB |
Off |
Off |
Off |
On |
Off |
|
DRAM SWITCH CONFIGURATION (CONT.) | |||||
|
Size |
SW1/switch 1 |
SW1/switch 2 |
SW1/switch 3 |
SW1/switch 4 |
SW1/switch 5 |
|
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 |
TAG |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(1) 32K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 32K x 8 |
|
Note:The exact location of TAG is unknown. | |||
|
CACHE JUMPER CONFIGURATION | ||||
|
Size |
W20 |
W21 |
W41 |
W44 |
|
64KB |
Open |
Open |
Open |
Pins 2 & 3 closed |
|
256KB |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |