MICRONICS COMPUTERS, INC.
EISA 3 VL-BUS SYSTEM BOARD
|
Processor |
80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive |
|
Processor Speed |
25/33/50(internal)/66(internal)MHz |
|
Chip Set |
Micronics |
|
Max. Onboard DRAM |
64MB |
|
Cache |
64/128/256/512KB |
|
BIOS |
Phoenix |
|
Dimensions |
355mm x 304mm |
|
I/O Options |
32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port, serial ports (2) |
|
NPU Options |
None |
|
CONNECTIONS |
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|
Purpose |
Location |
Purpose |
Location |
|
Hard drive LED |
CN1 |
Parallel port |
J30 |
|
External battery |
J3 |
Floppy drive interface |
J31 |
|
Turbo switch |
J4 |
IDE interface |
J32 |
|
Turbo LED |
J5 |
Serial port 1 |
J33 |
|
Power LED & keylock |
J8 |
Serial port 2 |
J34 |
|
Speaker |
J10 |
32-bit VESA Local bus slot |
S1 |
|
Reset switch |
J11 |
32-bit VESA Local bus slot |
S2 |
|
External keyboard connector |
J13 |
|
|
|
USER CONFIGURABLE SETTINGS |
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|
Function |
Jumper |
Position |
|
|
|
Factory configured - do not alter |
W1 |
pins 1 & 2 closed |
|
|
Monitor type select color |
W7 |
Closed |
|
|
Monitor type select monochrome |
W7 |
Open |
|
|
AT style keyboard |
W16 |
Open |
|
|
PS/2 style keyboard |
W16 |
Closed |
|
|
CMOS memory normal operation |
W17 |
pins 1 & 2 closed |
|
|
CMOS memory clear |
W17 |
pins 2 & 3 closed |
|
|
Real Time Clock memory normal operation |
W18 |
Open |
|
|
Real Time Clock memory clear |
W18 |
Closed |
|
Note: W18 may not appear on the system mainboard, depending upon the clock chip installed. If W18 is present, use it instead of W17. The location of W18 is unknown. |
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DRAM CONFIGURATION |
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|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
4MB |
(1) 1M x 36 |
NONE |
NONE |
NONE |
|
8MB |
(1) 1M x 36 |
(1) 1M x 36 |
NONE |
NONE |
|
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 |
|
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 36 |
(1) 4M x 36 |
NONE |
|
64MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
|
CACHE CONFIGURATION |
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|
Size |
Bank 0 |
Bank 1 |
TAG/U42 |
TAG/U43 |
TAG/U44 |
TAG/U45 |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
NONE |
NONE |
(1) 64K x 8 |
(1) 8K x 8 |
|
128KB |
(4) 32K x 8 |
NONE |
NONE |
NONE |
(1) 64K x 8 |
(1) 8K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 16K x1 |
(1) 16K x1 |
(1) 64K x 8 |
NONE |
|
512KB |
(4) 128K x 8 |
NONE |
NONE |
NONE |
(1) 64K x 8 |
(1) 32K x 8 |
|
CACHE JUMPER CONFIGURATION |
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|
Size |
W8 |
W9 |
W10 |
W11 |
W12 |
W13 |
W14 |
W15 |
|
64KB |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
3 & 4 |
2 & 3 |
|
128KB |
2 & 3 |
1 & 2 |
1 & 2 |
2 & 3 |
1 & 2 |
1 & 2 |
4 & 5 |
1 & 2 |
|
256KB |
2 & 3 |
2 & 3 |
1 & 2 |
2 & 3 |
2 & 3 |
1 & 2 |
1 & 2 |
1 & 2 |
|
512KB |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
4 & 5 |
1 & 2 |
|
Note:Pins designated should be in the closed position. |
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CPU TYPE CONFIGURATION |
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|
U1 |
U2 |
W2 |
W5 |
W6 |
|
None |
80486SX (PQFP) |
pins 1 & 2 |
pins 1 & 2 |
None |
|
80486SX |
None |
pins 1 & 2 |
pins 2 & 3 |
pins 2 & 3 |
|
80487SX |
80486SX (PQFP) |
pins 1 & 2 |
pins 2 & 3 |
pins 1 & 2, 3 & 4 |
|
80487SX |
None |
pins 1 & 2 |
pins 2 & 3 |
pins 1 & 2, 3 & 4 |
|
80486DX |
80486SX (PQFP) |
pins 2 & 3 |
pins 1 & 2 |
pins 1 & 2, 3 & 4 |
|
80486DX |
None |
pins 2 & 3 |
pins 1 & 2 |
pins 1 & 2, 3 & 4 |
|
80486DX2 |
80486SX (PQFP) |
pins 1 & 2 |
pins 2 & 3 |
pins 1 & 2, 3 & 4 |
|
80486DX2 |
None |
pins 1 & 2 |
pins 1 & 2 |
pins 1 & 2, 3 & 4 |
|
Pentium Overdrive |
None |
pins 2 & 3 |
pins 2 & 3 |
pins 1 & 2, 3 & 4 |
|
Note:Pins designated should be in the closed position. |
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CPU SPEED CONFIGURATION |
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|
CPU |
Speed |
W3 |
|
80486SX/80486DX |
25MHz |
On |
|
80486SX/80486DX |
33MHz |
Off |
|
80486DX2 |
50i MHz |
On |
|
80486DX2 |
66i MHz |
Off |