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What is a PDP-9?
Introduction
Introduced in 1966, the PDP-9 was a 18 bit minicomputer built by Digital (DEC). The machine was a successor to the PDP-7 minicomputer, which it was upwardly compatible with and had roughly double the performance of the earlier machine. The machine could address up to 32KW of core memory.
The PDP-9 was one of the first small/medium sized computers to feature a keyboard/monitor system (a rudimentary for of operating system) which ran on the DECtape storage system.
The PDP-9/L, a compact and lower cost version of the PDP-9 was introduced in 1968. Of the 450 PDP-9s produced, 40 were PDP-9/Ls.
The PDP-9 was replaced by the TTL based PDP-15 in 1969.
Options and Peripherals
| Option | Description | Capacity |
| CPU and memory | PDP-9 | 4KW – 32KW |
| CPU options | KE09A EAE, extended arithmetic element | |
| KG09A memory extension control | ||
| KP09A power fail detection | ||
| KX09A memory protection control | ||
| Console | KSR-33 Teletype | |
| Additional terminals | LT09 and KSR-33 Teletypes | 1-4 lines |
| Paper tape | PC09A paper tape reader and punch | |
| Real time clock | integral | |
| Line printer | Type 647E line printer (sixbit ASCII) | |
| LP09 line printer (sevenbit ASCII) | ||
| DECtape | TC02/TU55 DECtape | 148KW |
| Disk | RF09/RS09 fixed head disk | 2.1MW |
| RB09 fixed head disk | 1MW | |
| Magnetic tape | TC59 magnetic tape (9 track only) |