UNIDENTIFIED
50/33/25/20MHZ MAINBOARD
|
Processor |
80486SX/80487SX/80486DX/80486DX2 |
|
Processor Speed |
20/25/33/40/50 (Internal) /50/66 (Internal) |
|
Chip Set |
C & T |
|
Max. onboard DRAM |
32MB |
|
Cache |
64/128/256KB |
|
BIOS |
AMI |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
None |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Power LED & keylock |
J17 |
External battery |
J20 |
|
Speaker |
J18 |
Turbo switch |
J21 |
|
Reset switch |
J19 |
Turbo LED |
J22 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper/Switch |
Position | |
|
Monitor type select monochrome |
JP3 |
Open | |
|
Monitor type select color |
JP3 |
Closed | |
|
CMOS memory normal operation |
JP5 |
Pins 1 & 2 closed | |
|
CMOS memory clear |
JP5 |
Pins 2 & 3 closed | |
|
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) 256K x 9 |
(4) 1M x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
CACHE CONFIGURATION | ||||
|
Size |
Max Cachable |
Bank 0 |
Bank 1 |
TAG |
|
64KB |
16MB |
(4) 8K x 8 |
(4) 8K x 8 |
(1) 8K x 8 |
|
128KB |
32MB |
(4) 32K x 8 |
NONE |
(1) 8K x 8 |
|
256KB |
64MB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | ||
|
Size |
JP24 |
JP25 |
|
64KB |
Open |
Open |
|
128KB |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
256KB |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
CPU SPEED CONFIGURATION | |
|
Speed |
JP21 |
|
80486SX/20MHz |
Pins 5 & 6 closed |
|
80486SX/25MHz |
Pins 1 & 2, 5 & 6 closed |
|
80486SX/33MHz |
Pins 1 & 2, 3 & 4 closed |
|
80487SX/20MHz |
Pins 5 & 6 closed |
|
80486DX/25MHz |
Pins 1 & 2, 5 & 6 closed |
|
80486DX/33MHz |
Pins 1 & 2, 3 & 4 closed |
|
80486DX/40MHz |
Pins 5 & 6 closed |
|
80486DX/50MHz |
Pins 3 & 4 closed |
|
80486DX2/50i MHz |
Pins 1 & 2, 5 & 6 closed |
|
80486DX2/66i MHz |
Pins 1 & 2, 3 & 4 closed |
|
CPU TYPE CONFIGURATION | ||||
|
TYPE |
JP9 |
JP11 |
JP12 |
JP13 |
|
80486SX/20MHz |
Pins 2 & 3 closed |
Open |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
80486SX/25MHz |
Pins 1 & 2 closed |
Open |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
80486SX/33MHz |
Pins 1 & 2 closed |
Open |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
80487SX/20MHz |
Pins 2 & 3 closed |
Closed |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
|
80486DX/25MHz |
Pins 1 & 2 closed |
Closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
80486DX/33MHz |
Pins 1 & 2 closed |
Closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
80486DX/40MHz |
Pins 1 & 2 closed |
Closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
80486DX/50MHz |
Pins 1 & 2 closed |
Closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
80486DX2/50i MHz |
Pins 1 & 2 closed |
Closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
80486DX2/66i MHz |
Pins 1 & 2 closed |
Closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |