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# IBM CORPORATION
PS/2 MODEL 70 486/25
Processor 80486DX
Processor Speed 25MHz
Chip Set IBM
Max. Onboard 8MB
DRAM
Cache None
BIOS IBM
Dimensions 355.6mm x 304.8mm
I/O Options Serial port, parallel port, pointing device
connector, proprietary hard/floppy drive
controller slot, proprietary 16-bit MCA video
adapter slot, VGA port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+--------------------+----------|
| Battery/speaker | J1 | Keyboard | J5 |
|-----------------+----------+--------------------+----------|
| Serial port | J2 | Proprietary | J6 |
| | | hard/floppy drive | |
| | | controller | |
|-----------------+----------+--------------------+----------|
| Parallel port | J3 | Proprietary 16-bit | J7 |
| | | MCA video adaptor | |
|-----------------+----------+--------------------+----------|
| Pointing device | J4 | VGA port | J8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|--------+--------------+------------+------------+----------|
| 1MB | (1) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|--------+--------------+------------+------------+----------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 36 | 36 | | |
|--------+--------------+------------+------------+----------|
| 2MB | (1) 512K x | NONE | NONE | NONE |
| | 36 | | | |
|--------+--------------+------------+------------+----------|
| 3MB | (1) 256K x | (1) 256K x | (1) 256K x | NONE |
| | 36 | 36 | 36 | |
|--------+--------------+------------+------------+----------|
| 4MB | (1) 256K x | (1) 256K x | (1) 256K x | (1) 256K |
| | 36 | 36 | 36 | x 36 |
|--------+--------------+------------+------------+----------|
| 4MB | (1) 512K x | (1) 512K x | NONE | NONE |
| | 36 | 36 | | |
|--------+--------------+------------+------------+----------|
| 5MB | (1) 256K x | (1) 512K x | (1) 512K x | NONE |
| | 36 | 36 | 36 | |
|--------+--------------+------------+------------+----------|
| 6MB | (1) 256K x | (1) 256K x | (1) 512K x | (1) 512K |
| | 36 | 36 | 36 | x 36 |
|--------+--------------+------------+------------+----------|
| 6MB | (1) 512K x | (1) 512K x | (1) 512K x | NONE |
| | 36 | 36 | 36 | |
|--------+--------------+------------+------------+----------|
| 7MB | (1) 256K x | (1) 512K x | (1) 512K x | (1) 512K |
| | 36 | 36 | 36 | x 36 |
|--------+--------------+------------+------------+----------|
| 8MB | (1) 512K x | (1) 512K x | (1) 512K x | (1) 512K |
| | 36 | 36 | 36 | x 36 |
|------------------------------------------------------------|
| Notes:SIMMs are a proprietary IBM design, standard 36-bit |
| SIMMs can not be used. |
| |
| Onboard memory does not need to be totally populated in |
| order to use memory expansion cards. |
+------------------------------------------------------------+