PDP-11

The PDP-11 is a series of computers introduced in 1970 by Digital Equipment Corporation (DEC).

PDP-11 Models and notes

• PDP 11/20 (1970) - UNIBUS, 16-bit memory addressing (32KiW max)
• PDP 11/05 (1972) - UNIBUS, 16-bit memory addressing (32KiW max)
• PDP 11/10 (1972) - UNIBUS, 16-bit memory addressing (32KiW max)
• PDP 11/15 (1972) - UNIBUS, 16-bit memory addressing (32KiW max), OEM model
• PDP 11/40 (1973) - UNIBUS, 18-bit memory addressing (128KiW max)
• PDP 11/45 (1973) - UNIBUS, 18-bit memory addressing (128KiW max), fast bipolar memory
• PDP 11/70 (1975) - UNIBUS, 22-bit memory addressing (2048KiW max)
• PDP 11/03 (1975) - QBUS, 16-bit memory addressing (32KiW max), first QBUS model, first F-11
• LSI-11 (1975) - QBUS, 16-bit memory addressing, OEM model
• PDP 11/34 (1976) - UNIBUS, 18-bit memory addressing (128KiW max)
• PDP 11/04 (1976) - UNIBUS, 16-bit memory addressing (32KiW max)
• PDP 11/55 (1976) - UNIBUS, 18-bit memory addressing (128KiW max), fast bipolar memory
• PDP 11/60 (1977) - UNIBUS, 18-bit memory addressing, writable control store
• PDP 11/23 (1979) - QBUS, 18-bit or 22-bit addressing depending on backplane
• PDP 11/24 (1979) - UNIBUS, 22-bit memory addressing, first UNIBUS model to use F-11 chip
• PDP 11/44 (1979) - UNIBUS, 22-bit memory addressing, last non-LSI PDP-11
• PDP 11/23+ (1981) - QBUS, 22-bit memory addressing
• PDP 11/73 (1983) - QBUS, 22-bit memory addressing, first J-11 machine, 15MHz, integrated FPU, also first PMI PDP-11
• PDP 11/83 (1986) - QBUS, 22-bit memory addressing, J-11 at 18MHz, integrated FPU
• PDP 11/84 (1986) - UNIBUS, 22-bit memory addressing, J-11 at 18MHz, integrated FPU
• PDP 11/53 (1984) - QBUS, 22-bit memory, S-box or standard qbus, integrated FPU, integrated 768KW memory.
• PDP 11/93 (1990) - QBUS, 22-bit memory addressing, J-11 at 18MHz, integrated FPU, 2KiW onboard memory
• PDP 11/94 (1990) - UNIBUS, 22-bit memory addressing, J-11 at 18MHz, integrated FPU, 2KiW onboard memory