IBM CORPORATION
PS/2 MODEL 70 486/25
| 
 Processor  | 
 80486DX  | 
| 
 Processor Speed  | 
 25MHz  | 
| 
 Chip Set  | 
 IBM  | 
| 
 Max. Onboard DRAM  | 
 8MB  | 
| 
 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  | 
| 
 CONNECTIONS  | |||
| 
 Purpose  | 
 Location  | 
 Purpose  | 
 Location  | 
| 
 Battery/speaker  | 
 J1  | 
 Keyboard  | 
 J5  | 
| 
 Serial port  | 
 J2  | 
 Proprietary hard/floppy drive controller  | 
 J6  | 
| 
 Parallel port  | 
 J3  | 
 Proprietary 16-bit MCA video adaptor  | 
 J7  | 
| 
 Pointing device  | 
 J4  | 
 VGA port  | 
 J8  | 
| 
 DRAM CONFIGURATION  | ||||
| 
 Size  | 
 Bank 0  | 
 Bank 1  | 
 Bank 2  | 
 Bank 3  | 
| 
 1MB  | 
 (1) 256K x 36  | 
 NONE  | 
 NONE  | 
 NONE  | 
| 
 2MB  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 NONE  | 
 NONE  | 
| 
 2MB  | 
 (1) 512K x 36  | 
 NONE  | 
 NONE  | 
 NONE  | 
| 
 3MB  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 NONE  | 
| 
 4MB  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
| 
 4MB  | 
 (1) 512K x 36  | 
 (1) 512K x 36  | 
 NONE  | 
 NONE  | 
| 
 5MB  | 
 (1) 256K x 36  | 
 (1) 512K x 36  | 
 (1) 512K x 36  | 
 NONE  | 
| 
 6MB  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 (1) 512K x 36  | 
 (1) 512K x 36  | 
| 
 6MB  | 
 (1) 512K x 36  | 
 (1) 512K x 36  | 
 (1) 512K x 36  | 
 NONE  | 
| 
 7MB  | 
 (1) 256K x 36  | 
 (1) 512K x 36  | 
 (1) 512K x 36  | 
 (1) 512K x 36  | 
| 
 8MB  | 
 (1) 512K x 36  | 
 (1) 512K x 36  | 
 (1) 512K x 36  | 
 (1) 512K 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.  | ||||