UNIDENTIFIED
80486 MOTHERBOARD
|
Processor |
CX486S/80486SX/80487SX/80486DX/80486DX2/80486DX4 |
|
Processor Speed |
25/33/40/50/50i/66i/75i/100iMHz |
|
Chip Set |
Unidentified |
|
Max. Onboard DRAM |
64MB |
|
Cache |
64/128/256KB |
|
BIOS |
AMI |
|
Dimensions |
250mm x 220mm |
|
I/O Options |
32-bit VESA local bus slots (3) |
|
NPU Options |
None |
|
CONNECTIONS |
|||
|
Purpose |
Location |
Purpose |
Location |
|
CPU power board |
J10 |
Turbo LED |
JP18 |
|
External battery |
JP1 |
Reset switch |
JP19 |
|
Power LED & Keylock |
JP16 |
Turbo switch |
JP20 |
|
Speaker |
JP17 |
32-bit VESA local bus slots |
SL1-SL3 |
|
USER CONFIGURABLE SETTINGS |
|||
|
Function |
Jumper |
Position |
|
|
» |
VL-bus card select general |
JP2 |
pins 1 & 2 closed |
|
|
VL-bus card select Power 9000 |
JP2 |
pins 2 & 3 closed |
|
» |
Factory configured - do not alter |
JP3 |
N/A |
|
» |
80486DX4 power board voltage select 3.45 |
JP4 |
Open |
|
|
80486DX4 power board voltage select 5 |
JP4 |
Closed |
|
» |
80486DX4 clock speed select tripled |
JP28 |
Closed |
|
|
80486DX4 clock speed select doubled |
JP28 |
Open |
|
DRAM CONFIGURATION |
||
|
Size |
Bank 0 |
Bank 1 |
|
1MB |
(4) 256K x 9 |
NONE |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
|
4MB |
(4) 1M x 9 |
NONE |
|
5MB |
(4) 1M x 9 |
256K |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
20MB |
(4) 4M x 9 |
(4) 1M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
64MB |
(4) 16M x 9 |
NONE |
|
CACHE CONFIGURATION |
||||
|
Size |
Bank 0 |
Bank 1 |
Tag (U28) |
Tag (U29) |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(1) 8K x 8 |
NONE |
|
128KB |
(4) 32K x 8 |
NONE |
(1) 8K x 8 |
NONE |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 8K x 8 or (1) 32K x 8 |
(1) 8K x 8 or NONE |
|
CACHE JUMPER CONFIGURATION |
||||
|
Size |
JP9 |
JP10 |
JP11 |
JP12 |
|
64KB |
pins 1 & 2 closed |
Open |
Open |
Open |
|
128KB |
pins 2 & 3 closed |
pins 2 & 3 closed |
Closed |
Open |
|
256KB |
pins 1 & 2 closed |
pins 1 & 2 closed |
Closed |
Closed |
|
CPU CLOCK SPEED CONFIGURATION (MX8310) |
|||
|
Speed |
JP13 |
JP14 |
JP15 |
|
25MHz |
Closed |
Open |
Open |
|
33MHz |
Closed |
Closed |
Closed |
|
40MHz |
Closed |
Closed |
Open |
|
50MHz |
Open |
Open |
Closed |
|
50i MHz |
Closed |
Open |
Open |
|
66i MHz |
Closed |
Closed |
Closed |
|
75i MHz |
Closed |
Open |
Open |
|
100i MHz |
Open |
Open |
Closed |
|
CPU CLOCK SPEED CONFIGURATION (KTS0802C/PLL52C05) |
|||
|
Speed |
JP13 |
JP14 |
JP15 |
|
25MHz |
Closed |
Closed |
Open |
|
33MHz |
Open |
Closed |
Open |
|
40MHz |
Closed |
Open |
Closed |
|
50MHz |
Closed |
Open |
Open |
|
50i MHz |
Closed |
Closed |
Open |
|
66i MHz |
Open |
Closed |
Open |
|
75i MHz |
Closed |
Closed |
Open |
|
100i MHz |
Closed |
Open |
Open |
|
CPU TYPE SELECT |
|||
|
Type |
JP5-JP8 |
JP22 |
JP23 |
|
CX 486S |
Closed |
pins 2 & 3 closed |
Open |
|
80486SX |
Closed |
pins 2 & 3 closed |
Open |
|
80487SX |
Closed |
pins 1 & 2,3 & 4 closed |
pins 2 & 3 closed |
|
486DX/DX2 |
Closed |
pins 1 & 2,3 & 4 closed |
pins 1 & 2 closed |
|
80486DX4 |
Open |
pins 1 & 2,3 & 4 closed |
pins 1 & 2 closed |
|
Note: Using 80486DX4, CPU power board (optional) must be in J10. |
|||
|
VESA BUS SPEED CONFIGURATION |
|
|
Speed |
JP21 |
|
25MHz |
Open |
|
33MHz |
Open |
|
40MHz |
Open |
|
50MHz |
Closed |
|
50i MHz |
Open |
|
66i MHz |
Open |
|
75i MHz |
Open |
|
100i MHz |
Closed |