Introduced in 1969, the PDP-15 was DEC's fifth (and last) 18-bit computer system. Upward compatible from the PDP-9, it included several new architectural features, including indexing, expanded memory capacity, full memory protection, and floating point. The last PDP-15 was produced in the late 1970's.
Photographs (courtesy of Digital Equipment Corporation):
| Option | Description | Capacity |
| CPU and memory | PDP-15 | 4KW - 128KW |
| CPU options | KA15 automatic priority interrupt (API) | |
| KE15 extended arithmetic element (EAE) | ||
| KF15 power fail detection | ||
| KM15 memory protection control | ||
| KT15 memory relocation control | ||
| XM15 memory relocation and protection (XVM) | ||
| FP15 floating point processor (FPP) | ||
| UC15 I/O processor | ||
| Console | KSR-35 Teletype | |
| Additional terminals | LT19 and KSR-35 Teletypes | 1-16 lines |
| Paper tape | PC15 paper tape reader and punch | |
| Real time clock | KW15 real time clock | |
| Line printer | LP15 or LP09 line printer | |
| DECtape | TC15/TU56 DECtape | 148KW |
| Disk | RF15/RS15 fixed head disk | 2.1MW |
| RP15/RP02 disk pack | 10.4MW | |
| RK15/RK05 disk pack (on UC15) | 1.2MW | |
| Magnetic tape | TC59D magnetic tape (9 track only) |
Updated 08-Aug-2020 by Bob Supnik (simh AT groups DOT io - anti-spam encoded)
