UNIDENTIFIED
M-421
|
Processor |
80486SX/80486DX/80486DX2 |
|
Processor Speed |
25/33/50(internal)/66(internal)MHz |
|
Chip Set |
PC Chips |
|
Video Chip Set |
None |
|
Maximum Onboard Memory |
32MB |
|
Maximum Video Memory |
None |
|
Cache |
None |
|
BIOS |
AMI |
|
Dimensions |
220mm x 220mm |
|
I/O Options |
None |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Speaker |
J1 |
Turbo switch |
J4 |
|
Power LED & keylock |
J2 |
Reset switch |
J5 |
|
Turbo LED |
J3 |
External battery |
JP4 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
Battery type select internal |
JP4 |
Pins 2 & 3 closed | |
|
Battery type select external |
JP4 |
Open | |
|
CMOS memory clear |
JP4 |
Pins 3 & 4 closed | |
|
|
Monitor type select monochrome |
JP5 |
Open |
|
Monitor type select color |
JP5 |
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 |
|
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 |
|
CPU TYPE SELECTION | ||
|
Type |
JP1 |
JP2 |
|
80486SX |
Pins 1 & 2 closed |
Open |
|
80486DX |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
|
80486DX2 |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
|
NPU SELECTION |
|
Note: To install a 4167 NPU, install the Math Coprocessor Daughterboard over the CPU socket. |