PDP-9
 | |
 A PDP-9 on display at ACONIT in Grenoble, France | |
| Developer | Digital Equipment Corporation |
|---|---|
Product family | Programmed Data Processor |
| Type | Minicomputer |
| Released | 1966 |
| Units sold | 445 |
| Media | Paper tape, DECtape |
| Platform | PDP 18-bit |
| Weight | 750 pounds (340 kg) |
| Predecessor | PDP-7 |
| Successor | PDP-15 |
The PDP-9, the fourth of the five 18-bit minicomputers produced by Digital Equipment Corporation, was introduced in 1966. A total of 445 PDP-9 systems were produced, of which 40 were the compact, low-cost PDP-9/L units.