The following information is taken primarily from a DEC publication entitled Digital Equipment Corporation, Nineteen Fifty Seven to the Present, published in 1978.

I am interested in rescuing and restoring older DEC equipment. You can read more about that here.

1959 First PDP-1 delivered in 1959. The last PDP-1 was built in 1969. The machine was an 18-bit computer capable of addressing up to 32K of core memory. A total of 53 machines were built.
1961 DECUS (Digital Equipment Users Society) founded
1962 First PDP-4 delivered. It was another 18-bit machine but slightly different architecture than the PDP-1. A total of 54 machines were built.
1963 First PDP-5 delivered. It was a 12-bit minicomputer.
1964 First PDP-6 was released late in the year. A total of 23 of the 36-bit systems were installed.

The PDP-7, an 18-bit machine and the successor to the PDP-4. The PDP-7A was built about a year later. 120 PDP-7s were sold.

1965 First PDP-8 ("classic 8") was released.
1966 PDP-8/S ("serial") developed in nine months. This was the first computer with 4K of memory that sold for less than $10,000.

PDP-9, an 18-bit computer, was released. It was about twice as fast as the PDP-7. Later in the year the PDP-9/L (a more compact PDP-9) was released and eventually 40 were sold.

LINC-8 ("Laboratory Instrument Computer") was built, based on an earlier MIT Lincoln Labs design and a PDP-8 processor.

1967 PDP-10 announced as a replacement for the PDP-6.
1968 PDP-8/I (more expandable than the PDP-8/S) and PDP-8/L (smaller OEM version) released.
1969 PDP-12 released as a successor to the LINC-8.

PDP-15 announced as a replacement for the PDP-9 and PDP-9/L. It offered a separate processor dedicated to I/O. More than 400 of these 18-bit machines were ordered in the first 8 months.

PDP-14 delivered in March, targeted primarily for the relay-logic market.

1970 PDP-8/E announced as a replacement for the PDP-8/I. It included an OMNIBUS synchronous bus.

The first in a long line of PDP-11 machines was announced, the PDP-11/20. It was a 16-bit UNIBUS machine.

PDP-14/L released as a lower cost machine with reduced I/O capability.

1971 PDP-8/M announced as an OEM version of the PDP-8/E with only one OMNIBUS mounting block.

PDP-11/15 released in the second quarter.

PDP-11/05 released for the OEM market.

PDP-11/45 released, containing core, metallic-oxide semiconductor and bipolar semiconductor memory technologies. Could hold as much as 128K and could run RSTS/E, RSX-11D and a FORTRAN system.

1972 PDP-8/F introduced in March as an end user replacement for the PDP-8/M.

PDP-16/M announced for customers who needed a low-end machine. Used PROM (programmable read-only memory) and various options to provide a dedicated system.

1973 PDP-11/10 released as an end user version of the PDP-11/20. It included a four-level interrupt structure and multiple accumulators.

PDP-11/40 released with about twice the power of the PDP-11/20. A floating point package was offered as an option.

1974 PDP-14/30 and PDP-14/35 released as programmable controllers. A new VT14 programming terminal could be used to program them.

PDP-8/A released in May in two forms, an 8/A Module Kit and an 8/A OEM Kit.

RT-11 introduced for a single user. It ran on any available PDP-11 with at least 8K of memory.

RSX-11M introduced as a subset of RSX-11D.

EDUSYSTEMS-100, 200 and 250 introduced. These packaged systems were BASIC language, core memory based designed for 1 to 8 users.

1975 PDP-8/A-200 released, including a PDP-8/A with 4K semiconductor RAM, an operator console and a 12-slot OMNIBUS. A one-hour memory refresh battery backup was also included. PDP-8/A-400 released, which was a PDP-8/A-200 but with two core memory boards. The machine could be expanded up to 32K memory.

PDP-11/04 released in December for the OEM market. It is the third generation PDP-11 but remains completely program compatible with the PDP-11/05.

PDP-11/70 announced in February as the "big brother" to the PDP-11/45. It could run RSTS/E and RSX-11D.

LSI-11 announced in February as a complete computing system (CPU, Memory and I/O) on a single printed circuit board.

PDP-11/03 introduced as a packaged version of the LSI-11.

RX01 dual floppy disc drive introduced in May. Each floppy could hold up to 256 KB in an IBM-compatible format.

RP04 disc drive introduced for the PDP-11/35, 11/40, 11/45 and 11/50 as well as DECsystem-10 computers. It could hold 88 MB (formatted) and a transfer rate of 1.25 microseconds per byte.

LA36 DECwriter II introduced.

VT50 DECSCOPE released in September

VT50 DECSCOPE released in September. It ran up to 9600 baud and was microprocessor-controlled.

DECNET introduced in April.

1976 PDP-8/A-800 series introduced as a high performance FORTRAN platform with extended precision floating point capability.

PDP-11V03 released as a roll-around RT-11 platform based on the LSI-11.

PDP-11T55 announced in December as a high performance disk-based system. The 11T55 was a redesigned 11/45 processor, 32K bipolar memory (with parity) and a FP11-C floating point processor.

PDP-8/A-600 series introduced as a replacement for the PDP-8/E, PDP-8/F and PDP-8/M machines.

PDP-11/34 introduced as a system, including an 11/34 processor with 32K memory, a dual drive RK11/RK05 and an LA36 printing terminal.

RP05 introduced as a 100 MB disc drive.

RP06 introduced as a 200 MB disc drive.

RK05J introduced as a more reliable RK05.

RK05F introduced as a non-removable version of the RK05J with twice the track density. It provided 6.64 MB on a PDP-8 and a 5 MB capacity on the PDP-11.

VT52 terminal introduced as an enhanced VT50.

1977 PDP-11/34A introduced an an improved PDP-11/34.

PDP-11S55 introduced as a PDP-11/55 processor with 32K byte core, an FP11-C floating point processor, an RK611 (14 MB disk cartridge drive), RK06.

RK06 introduced as as 14MB disc cartridge drive, midway between the RK05 and the RP series drives.

PRS01 Paper Tape Reader for the LA36 introduced, using a 20mA current loop interface.

PDP-11/60 introduced in March as a UNIBUS machine with cache memory.

DECstation introduced as a computer based on the VT78 Video Data Processor, essentially a PDP-8.

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Last updated November 19, 2005