PDP-11
From Computer History Wiki
The PDP-11 is a series of computers introduced in 1970 by Digital Equipment Corporation (DEC).
The machine word size was 16 bits. For more information, see PDP-11 architecture.
PDP-11 Models and notes
| Model | Year of Introduction | Bus Type | Memory Addressing | Notes |
| PDP-11/20 | (1970) | UNIBUS | 16-bit | |
| PDP-11/05 | (1972) | UNIBUS | 16-bit | |
| PDP-11/10 | (1972) | UNIBUS | 16-bit | |
| PDP-11/15 | (1972) | UNIBUS | 16-bit | OEM model |
| PDP-11/40 | (1973) | UNIBUS | 18-bit | |
| PDP-11/45 | (1973) | UNIBUS | 18-bit | core memory |
| PDP-11/50 | (1975) | UNIBUS | 18-bit | MOS memory |
| PDP-11/70 | (1975) | UNIBUS | 22-bit | |
| PDP-11/03 | (1975) | QBUS | 16-bit | first QBUS model, first F-11 |
| PDP-11/34 | (1976) | UNIBUS | 18-bit | |
| PDP-11/04 | (1976) | UNIBUS | 16-bit | |
| PDP-11/55 | (1976) | UNIBUS | 18-bit | fast bipolar memory |
| PDP-11/60 | (1977) | UNIBUS | 18-bit | writable control store |
| PDP-11/23 | (1979) | QBUS | 18-bit or 22-bit | |
| PDP-11/24 | (1979) | UNIBUS | 22-bit | first UNIBUS model to use F-11 chip |
| PDP-11/44 | (1979) | UNIBUS | 22-bit | last non-LSI PDP-11 |
| PDP-11/23+ | (1981) | QBUS | 22-bit | |
| PDP-11/73 | (1983) | QBUS | 22-bit memory addressing | first J-11 machine, 15MHz, integrated FPU, also first PMI PDP-11 |
| PDP-11/53 | (1984) | QBUS | 22-bit | S-box or standard qbus, integrated FPU |
| PDP-11/83 | (1986) | QBUS | 22-bit | J-11 at 18MHz, integrated FPU |
| PDP-11/84 | (1986) | UNIBUS | 22-bit | J-11 at 18MHz, integrated FPU, 768KiW memory |
| PDP-11/93 | (1990) | QBUS | 22-bit | J-11 at 18MHz, integrated FPU, 2MiW onboard memory |
| PDP-11/94 | (1990) | UNIBUS | 22-bit | J-11 at 18MHz, integrated FPU, 2MiW onboard memory |
