MECER CORPORATION
B860/B860 (REV. A)
|
Processor |
CX486SX/80486SX/80486DX/80486DX2/Pentium Overdrive |
|
Processor Speed |
25/33/40/50(internal)/50/66(internal)MHz |
|
Chip Set |
Unidentified |
|
Max. Onboard DRAM |
32/128MB (depends on board revision) |
|
Cache |
128/256KB |
|
BIOS |
AMI |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
32-bit VESA local bus slots (2) |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Power LED & keylock |
JP6 pins 1 - 5 |
Reset switch |
JP6 pins 19 - 20 |
|
Speaker |
JP6 pins 6 - 9 |
External battery |
JP17 |
|
Turbo LED |
JP6 pins 11 - 12 |
Auxiliary keyboard connector |
JP35 |
|
Turbo switch |
JP6 pins 16 - 17 |
32-bit VESA local bus slots |
SL1 & SL2 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
PQFP CPU disabled |
JP1 |
Closed |
|
PQFP CPU enabled |
JP1 |
Open | |
|
|
CMOS memory normal operation |
JP16 |
pins 1 & 2 closed |
|
CMOS memory clear |
JP16 |
pins 2 & 3 closed | |
|
|
Battery type select 4.5v |
JP34 |
Closed |
|
Battery type select 6.0v |
JP34 |
Open | |
|
|
CPU speed select 20/25MHz |
JP72 |
Closed |
|
CPU speed select => 33MHz |
JP72 |
Open | |
|
|
VESA card select normal |
JP89 |
Closed |
|
VESA card select Weitek VESA card only |
JP89 |
Open | |
|
DRAM CONFIGURATION (REV. 0) | ||
|
Size |
Bank 0 |
Bank 1 |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
|
5MB |
(4) 256K x 9 |
(4) 1M x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
17MB |
(4) 256K x 9 |
(4) 4M x 9 |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
DRAM CONFIGURATION (REV. A) | ||
|
Size |
Bank 0 |
Bank 1 |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
|
5MB |
(4) 256K x 9 |
(4) 1M x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
17MB |
(4) 256K x 9 |
(4) 4M x 9 |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
65MB |
(4) 256K x 9 |
(4) 16M x 9 |
|
68MB |
(4) 1M x 9 |
(4) 16M x 9 |
|
80MB |
(4) 4M x 9 |
(4) 16M x 9 |
|
128MB |
(4) 16M x 9 |
(4) 16M x 9 |
|
DRAM JUMPER CONFIGURATION | ||||||
|
Revision |
JP76 |
JP77 |
JP90 |
JP91 |
JP92 |
JP93 |
|
Rev. 0 |
1 & 2 |
2 & 3 |
Open |
Open |
Open |
2 & 3 |
|
Rev. A |
2 & 3 |
1 & 2 |
Closed |
Closed |
Closed |
1 & 2, 3 & 4 |
|
Note: Pins designated should be in the closed position. | ||||||
|
CACHE CONFIGURATION | |||
|
Size |
Bank 0 |
Bank 1 |
TAG |
|
128KB |
(4) 32K x 8 |
NONE |
(1) 8K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | ||
|
Size |
JP7 |
JP8 |
|
128KB |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
256KB |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
CPU TYPE CONFIGURATION | |||||
|
Type |
JP2 |
JP3 |
JP4 |
JP5 |
JP9 |
|
CX486SX |
2 & 3 |
Open |
Open |
2 & 4 |
2 & 3 |
|
80486SX (PQFP) |
Open |
Open |
Open |
3 & 5 |
2 & 3 |
|
80486SX (PGA) |
2 & 3 |
Open |
Open |
2 & 3 |
2 & 3 |
|
80486DX |
1 & 2, 3 & 4 |
2 & 3 |
Open |
2 & 3 |
2 & 3 |
|
80486DX2 |
1 & 2, 3 & 4 |
2 & 3 |
Open |
2 & 3 |
2 & 3 |
|
Pentium Overdrive |
1 & 2, 3 & 4 |
1 & 2 |
Closed |
2 & 3 |
2 & 3 |
|
Note: Pins designated should be in the closed position. | |||||
|
CPU SPEED CONFIGURATION | ||
|
Speed |
JP33 |
JP36 |
|
25MHz |
pins 2 & 3 closed |
pins 2 & 6, 4 & 8 closed |
|
33MHz |
pins 2 & 3 closed |
pins 3 & 7, 4 & 8 closed |
|
40MHz |
pins 2 & 3 closed |
pins 2 & 6 closed |
|
50iMHz |
pins 2 & 3 closed |
pins 2 & 6, 4 & 8 closed |
|
50MHz |
pins 1 & 2 closed |
pins 3 & 7 closed |
|
66iMHz |
pins 2 & 3 closed |
pins 3 & 7, 4 & 8 closed |
|
VESA WAIT STATE CONFIGURATION | |
|
Wait states |
ID2 |
|
0 wait states |
Open |
|
1 wait state |
Closed |
|
BUS SPEED CONFIGURATION | |
|
CPU speed |
ID3 |
|
<= 33MHz |
Open |
|
> 33MHz |
Closed |
|
PAL JUMPER CONFIGURATION | |||||
|
Revision |
JP96 |
TP1 |
TP2 |
TP3 |
TP4 |
|
Rev. 0 |
Open |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
|
Rev. A |
Closed |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
|
Note: Pins designated should be in the closed position. | |||||
|
BOARD REVISION JUMPER CONFIGURATION | ||||
|
Revision |
JP78 |
JP79 |
JP97 |
JP98 |
|
Rev. 0 |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
Rev. A |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
Note: These jumpers configure the board revision. | ||||