The PDP-4 was similar to the PDP-1 and used a similar instruction set, but used slower memory and different packaging to lower the price.

; PDP-1: The original PDP, an 18-bit machine used in early time-sharing operating system work, and prominent in early hacker culture.

The PDP-1 used punched paper tape as its primary storage medium.

Offline devices were typically Friden Flexowriters that had been specially built to operate with the FIO-DEC character coding used by the PDP-1.

MIT hackers also used the PDP-1 for playing music in four-part harmony, using some special hardware — four flip-flops directly controlled by the processor ( the audio signal was filtered with simple RC filters ).

An example of this is the core memory used by Digital Equipment Corporation for their PDP-1 computer ; this strategy continued through all of the follow-on core memory systems built by DEC for their PDP line of air-cooled computers.

Smaller machines like the PDP-1 / PDP-9 / PDP-15 used 18-bit words, so a double word would be 36 bits.

It was first implemented on the PDP-1 and was used to provide a commercial time sharing service by BBN in the Boston area and later by Time Sharing Ltd. in the United Kingdom.

; PDP-4: Supposed to be a slower, cheaper alternative to the PDP-1, but not commercially successful ; all later 18-bit PDP machines ( 7, 9 and 15 ) were based on its instruction set.

The PDP-1 was supplied standard with 4096 words of core memory, 18-bits per word, and ran at a basic speed of 100, 000 operations per second.

Architecturally it was essentially a PDP-1 stretched to 36-bit word width.

At the museum's PDP-1 restoration celebration in May 2006, Alan Kotok said his Macintosh PowerBook G4 laptop was 10, 000 times faster, came with 100, 000 times the RAM and 500, 000 times the storage, was 1 / 2000 the size, and cost 1 / 100 as much.

In 2011, Bushnell stated that the game was inspired by previous versions of electronic tennis he had played before ; Bushnell played a version on a PDP-1 computer in 1964 while attending college.

One such system had been developed for the PDP-1 at MIT by Daniel Murphy before he joined BBN.

Bolt, Beranek and Newman had a " similar program " and T-Square was developed by Peter Samson and one or more fellow MIT students in 1962, both for the PDP-1.

TMRC was even offered its own PDP-1 by 1965, although it had no space in which to install it and thus was forced to decline the gift.

In September 1961, DEC donated to MIT's RLE lab the second PDP-1 that it had produced.

He created the MCWS because he wanted to add an instruction to the PDP-1 computer, and the lab administrators had forbidden anyone “ not qualified ” from messing with the computer hardware.

Expensive Typewriter was a text editing program that ran on the DEC PDP-1 computer that had been recently delivered at MIT.

This is a canonical example of the PDP-1, with the console typewriter on the left, CPU and main control panel in the center, the Type 30 display on the right.

Wesley Allison Clark ( born 1927 ) is a computer scientist and one of the main participants, along with Charles Molnar, in the creation of the LINC laboratory computer, which was the first mini-computer and shares with a number of other computers ( such as the PDP-1 ) the claim to be the inspiration for the personal computer.

Interestingly, the PDP-1 has a hardware built-in loader, such that an operator need only push the " load " switch to instruct the paper tape reader to load a program directly into core memory ; the boot loader reads into core memory either the second-stage boot loader ( called Binary Loader of paper tape with checksum ) or the operating system from an outside storage medium such as a paper tape, a punched card, or a disk drive.

A PDP-1 system, with Steve Russell, developer of Spacewar!

BBN's initial system, designed by Sheldon Boilen, supported five simultaneous users on a DEC PDP-1, all sharing a single CRT screen for output.

In August 1959, Ben Gurley started design of the company's first computer, the PDP-1.

The first PDP-1 was delivered to Bolt, Beranek and Newman in November 1960, and formally accepted the next April.

The PDP-1 sold in basic form for $ 120, 000, or about $ 900, 000 in 2011 US dollars.

When DEC introduced the PDP-1, they also mentioned larger machines at 24, 30 and 36-bits, based on the same design.

During construction of the prototype PDP-1, some design work was carried out on a 24-bit PDP-2, and the 36-bit PDP-3.

Like the PDP-1, about 54 PDP-4's were eventually sold, most to a customer base similar to the original PDP-1.

A more dramatic upgrade to the PDP-1 series was introduced in August 1966, the PDP-9.

The new machine, the first outside the PDP-1 mould, was introduced at WESTCON on 11 August 1963.

Like the PDP-1 before it, the PDP-5 inspired a series of newer models based on the same basic design that would go on to be more famous than its parent.

" Much of the TMRC's jargon was later imported into early computing culture, because the club started using a DEC PDP-1 and applied its local model railroad slang in this computing context.

The PDP-1 ( Programmed Data Processor-1 ) was the first computer in Digital Equipment Corporation's PDP series and was first produced in 1960.

The PDP-1 was built mostly of DEC 1000-series System Building Blocks, using Micro-Alloy and Micro-Alloy-Diffused transistors with a rated switching speed of 5 MHz.

The design of the PDP-1 was based on the pioneering TX-0 computer, designed and built at MIT Lincoln Laboratory.

The first PDP-1 was delivered to Bolt, Beranek and Newman ( BBN ) in November 1960, and formally accepted the next April.

In 1962, DEC donated the engineering prototype PDP-1 to MIT, where it was placed in the room next to its ancestor, the TX-0 computer, which was by then on indefinite loan from Lincoln Laboratory.

In this setting, the PDP-1 quickly replaced the TX-0 as the favourite machine among the budding hacker culture, and served as the platform for a wide variety of " firsts " in the computing world.

The PDP-1 sold in basic form for.