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# WESTERN DIGITAL CORPORATION
WD486-MCB
Processor 80486DX
Processor Speed 25MHz
Chip Set WD
Max. Onboard 40MB
DRAM
Cache None
BIOS Intel
Dimensions 330mm x 218mm
I/O Options Parallel port, serial ports (2), floppy drive
interface, SCSI interface, VGA port, bus
mouse port, CPU module interface slot, MCA
riser card expansion slot
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| CPU module | J1 | Parallel port | J5 |
| interface | | | |
|---------------------+----------+----------------+----------|
| MCA riser card | J2 | VGA port | J6 |
|---------------------+----------+----------------+----------|
| Floppy drive | J3 | SCSI interface | J7 |
| interface | | | |
|---------------------+----------+----------------+----------|
| Serial ports (2) | J4 | Mouse port | J9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | J10 | J11 | J12 | J13 | J14 | J15 |
|------+--------+--------+--------+--------+--------+--------|
| 4MB | (1) 1M | (1) 1M | NONE | NONE | NONE | NONE |
| | x 18 | x 18 | | | | |
|------+--------+--------+--------+--------+--------+--------|
| 4MB | (1) 1M | NONE | NONE | NONE | NONE | NONE |
| | x 36 | | | | | |
|------+--------+--------+--------+--------+--------+--------|
| 8MB | (1) 1M | (1) 1M | (1) 1M | (1) 1M | NONE | NONE |
| | x 18 | x 18 | x 18 | x 18 | | |
|------+--------+--------+--------+--------+--------+--------|
| 8MB | (1) 1M | (1) 1M | (1) 1M | NONE | NONE | NONE |
| | x 18 | x 18 | x 36 | | | |
|------+--------+--------+--------+--------+--------+--------|
| 8MB | (1) 1M | NONE | (1) 1M | (1) 1M | NONE | NONE |
| | x 36 | | x 18 | x 18 | | |
|------+--------+--------+--------+--------+--------+--------|
| 8MB | (1) 1M | NONE | (1) 1M | NONE | NONE | NONE |
| | x 36 | | x 36 | | | |
|------+--------+--------+--------+--------+--------+--------|
| 12MB | (1) 1M | (1) 1M | (1) 1M | (1) 1M | (1) 1M | NONE |
| | x 18 | x 18 | x 18 | x 18 | x 36 | |
|------+--------+--------+--------+--------+--------+--------|
| 12MB | (1) 1M | (1) 1M | (1) 1M | NONE | (1) 1M | NONE |
| | x 18 | x 18 | x 36 | | x 36 | |
|------+--------+--------+--------+--------+--------+--------|
| 12MB | (1) 1M | NONE | (1) 1M | (1) 1M | (1) 1M | NONE |
| | x 36 | | x 18 | x 18 | x 36 | |
|------+--------+--------+--------+--------+--------+--------|
| 12MB | (1) 1M | NONE | (1) 1M | (1) 1M | NONE | NONE |
| | x 36 | | x 36 | x 36 | | |
|------+--------+--------+--------+--------+--------+--------|
| 16MB | (1) 1M | (1) 1M | (1) 1M | (1) 1M | (1) 1M | (1) 1M |
| | x 18 | x 18 | x 18 | x 18 | x 36 | x 36 |
|------+--------+--------+--------+--------+--------+--------|
| 16MB | (1) 1M | NONE | (1) 1M | (1) 1M | (1) 1M | (1) 1M |
| | x 36 | | x 18 | x 18 | x 36 | x 36 |
|------+--------+--------+--------+--------+--------+--------|
| 16MB | (1) 1M | (1) 1M | (1) 1M | NONE | (1) 1M | (1) 1M |
| | x 18 | x 18 | x 36 | | x 36 | x 36 |
|------+--------+--------+--------+--------+--------+--------|
| 16MB | (1) 1M | NONE | (1) 1M | NONE | (1) 1M | (1) 1M |
| | x 36 | | x 36 | | x 36 | x 36 |
|------+--------+--------+--------+--------+--------+--------|
| 16MB | (1) 4M | (1) 4M | NONE | NONE | NONE | NONE |
| | x 18 | x 18 | | | | |
|------+--------+--------+--------+--------+--------+--------|
| 20MB | (1) 4M | (1) 4M | (1) 1M | (1) 1M | NONE | NONE |
| | x 18 | x 18 | x 18 | x 18 | | |
|------+--------+--------+--------+--------+--------+--------|
| 20MB | (1) 4M | (1) 4M | (1) 1M | NONE | NONE | NONE |
| | x 18 | x 18 | x 36 | | | |
|------+--------+--------+--------+--------+--------+--------|
| 20MB | (1) 4M | (1) 4M | NONE | NONE | (1) 1M | NONE |
| | x 18 | x 18 | | | x 36 | |
|------+--------+--------+--------+--------+--------+--------|
| 20MB | (1) 4M | (1) 4M | NONE | NONE | NONE | (1) 1M |
| | x 18 | x 18 | | | | x 36 |
|------+--------+--------+--------+--------+--------+--------|
| 24MB | (1) 4M | (1) 4M | (1) 1M | (1) 1M | (1) 1M | NONE |
| | x 18 | x 18 | x 18 | x 18 | x 36 | |
|------+--------+--------+--------+--------+--------+--------|
| 24MB | (1) 4M | (1) 4M | (1) 1M | (1) 1M | NONE | (1) 1M |
| | x 18 | x 18 | x 18 | x 18 | | x 36 |
|------+--------+--------+--------+--------+--------+--------|
| 24MB | (1) 4M | (1) 4M | NONE | NONE | (1) 1M | (1) 1M |
| | x 18 | x 18 | | | x 36 | x 36 |
|------+--------+--------+--------+--------+--------+--------|
| 24MB | (1) 4M | (1) 4M | (1) 1M | NONE | (1) 1M | NONE |
| | x 18 | x 18 | x 36 | | x 36 | |
|------+--------+--------+--------+--------+--------+--------|
| 28MB | (1) 4M | (1) 4M | (1) 1M | (1) 1M | (1) 1M | (1) 1M |
| | x 18 | x 18 | x 18 | x 18 | x 36 | x 36 |
|------+--------+--------+--------+--------+--------+--------|
| 28MB | (1) 4M | (1) 4M | (1) 1M | (1) 1M | (1) 1M | NONE |
| | x 18 | x 18 | x 36 | x 36 | x 36 | |
|------+--------+--------+--------+--------+--------+--------|
| 32MB | (1) 4M | (1) 4M | (1) 4M | (1) 4M | NONE | NONE |
| | x 18 | x 18 | x 18 | x 18 | | |
|------+--------+--------+--------+--------+--------+--------|
| 36MB | (1) 4M | (1) 4M | (1) 4M | (1) 4M | (1) 1M | NONE |
| | x 18 | x 18 | x 18 | x 18 | x 36 | |
|------+--------+--------+--------+--------+--------+--------|
| 36MB | (1) 4M | (1) 4M | (1) 4M | (1) 4M | NONE | (1) 1M |
| | x 18 | x 18 | x 18 | x 18 | | x 36 |
|------+--------+--------+--------+--------+--------+--------|
| 40MB | (1) 4M | (1) 4M | (1) 4M | (1) 4M | (1) 1M | (1) 1M |
| | x 18 | x 18 | x 18 | x 18 | x 36 | x 36 |
+------------------------------------------------------------+