The PDP-11 was introduced in 1970, a time when most computing was done on expensive GE, CDC, and IBM mainframes that few people had access to. There were no laptops, desktops, or personal computers. Programming was done by only a few companies, mostly in assembly, COBOL, and FORTRAN. Input was done on punched cards, and programs ran in non-interactive batch runs.
Although the first PDP-11 was modest, it laid the groundwork for an invasion of minicomputers that would make a new generation of computers more readily available, essentially creating a revolution in computing. The PDP-11 helped birth the UNIX operating system and the C programming language. It would also greatly influence the next generation of computer architectures. During the 22-year lifespan of the PDP-11—a tenure unheard of by today’s standards—more than 600,000 PDP-11s were sold.
Early PDP-11 models were not overly impressive. The first PDP-11 11/20 cost $20,000, but it shipped with only about 4KB of RAM. It used paper tape as storage and had an ASR-33 teletype printer console that printed 10 characters per second. But it also had an amazing orthogonal 16-bit architecture, eight registers, 65KB of address space, a 1.25 MHz cycle time, and a flexible UNIBUS hardware bus that would support future hardware peripherals. This was a winning combination for its creator, Digital Equipment Corporation.
arstechnica.com
Although the first PDP-11 was modest, it laid the groundwork for an invasion of minicomputers that would make a new generation of computers more readily available, essentially creating a revolution in computing. The PDP-11 helped birth the UNIX operating system and the C programming language. It would also greatly influence the next generation of computer architectures. During the 22-year lifespan of the PDP-11—a tenure unheard of by today’s standards—more than 600,000 PDP-11s were sold.
Early PDP-11 models were not overly impressive. The first PDP-11 11/20 cost $20,000, but it shipped with only about 4KB of RAM. It used paper tape as storage and had an ASR-33 teletype printer console that printed 10 characters per second. But it also had an amazing orthogonal 16-bit architecture, eight registers, 65KB of address space, a 1.25 MHz cycle time, and a flexible UNIBUS hardware bus that would support future hardware peripherals. This was a winning combination for its creator, Digital Equipment Corporation.
A brief tour of the PDP-11, the most influential minicomputer of all time
It helped popularize the interactive computing paradigm we take for granted today.
arstechnica.com
