digital video games, Spacewar!, the first text editor, the first word processor, the first interactive debugger, the first credible computer chess program, one of the very earliest time-sharing systems (BBN Time-Sharing System), and some of the earliest computerized music. At the Computer History Museum TX-0 alumni reunion in 1984, Gordon Bell said DEC's products developed directly from the TX-2, the successor to the TX-0 which had been developed at what Bell thought was a bargain price at the time, about . At the same meeting, Jack Dennis said Ben Gurley's design for the PDP-1 was influenced by his work on the TX-0 display. The PDP-1 sold in basic form for (equivalent to in ). BBN's system was quickly followed by orders from Lawrence Livermore and Atomic Energy of Canada (AECL), and eventually 53 PDP-1s were delivered until production ended in 1969. All of these machines were still being actively used in 1970, and several were eventually saved. MIT's example was donated to The Computer Museum, Boston, and from there ended up at the Computer History Museum (CHM). A late version of Spacewar! on paper tape was still tucked into the case. PDP-1 #44 was found in a barn in Wichita, Kansas in 1988, apparently formerly owned by one of the many aviation companies in the area, and rescued for the Digital Historical Collection, also eventually ending up at the CHM. AECL's computer was sent to Science North, but was later scrapped. The launch of the PDP-1 marked a radical shift in the philosophy of computer design: it is the first commercial computer that focuses on interaction with the user rather than just the efficient use of computer cycles. The first ever reference to malicious hacking is 'telephone hackers' in MIT's student newspaper, The Tech of hackers tying up the lines with Harvard, configuring the PDP-1 to make free calls, war dialing and accumulating large phone bills. Peripherals The PDP-1 uses punched paper tape as its primary storage medium. Unlike punched card decks, which could be sorted and re-ordered, paper tape is difficult to physically edit. This inspired the creation of text-editing programs such as Expensive Typewriter and TECO. Because it is equipped with online and offline printers that were based on IBM electric typewriter mechanisms, it is capable of what, in 1980s terminology, would be called "letter-quality printing" and therefore inspired TJ-2, arguably the first word processor. The console typewriter