1. University of Utah 1 Minicomputers Embraced microchip technology Minicomputers flood market in late 1960s, early 1970s

2. University of Utah 2 Minicomputers New standard -16-bit word length

3. University of Utah 3 Not DEC! Computer Controls Corporation -DDP-116 (1964) -First 16-bit minicomputer

4. University of Utah 4 Interesting Footnote Honeywell DDP-516 -Descendent of DDP-115 -Used in ARPANET precursor to Internet -IMP (interface message processor) for main computers

5. University of Utah 5 What's DEC doing? PDP-X (16-bit) -designed by Edson DeCastro Rejected by DEC management DeCastro leaves (1968)

6. University of Utah 6 Data General Founded by Edson DeCastro “Nova” computer (1968) -16-bit word length -integrated circuits

7. University of Utah 7 Chips as memory? Pioneered by Illiac IV (1970) Data General “Super Nova” (1971) Beginning of end for core memory

8. University of Utah 8 Intel Founded 1968 by ex-employees of Fairchild Semiconductor -among whom is Robert Noyce Intel = “Integrated Electronics” 1K RAM chip (1970)

9. University of Utah 9 Burroughs Started out making mechanical calculators Entered computer business in 1953 -bought out Electrodata -First computer: B205

10. University of Utah 10 10 Burroughs Started out making mechanical calculators Entered computer business in 1953 -bought out Electrodata -First computer: B205 The Bat Computer!

11. University of Utah 11 11 Burroughs Designed hardware around software! -B5000 (1961): designed for ALGOL used virtual memory! -B2000 (1962): designed for COBOL

12. University of Utah 12 12 Burroughs Distant second to IBM Barely mentioned in our textbook -Why?

13. University of Utah 13 13 Burroughs Merged with Sperry (owner of UNIVAC) in 1986 Unisys!

14. University of Utah 14 14 Back to DEC PDP-11 (1970) -16-bit word length -bus connects all units

15. University of Utah 15 15 PDP-11 Most popular minicomputer of all time >170,000 sold during 1970s $10,000

16. University of Utah 16 16 PDP-11 First minicomputer to support high-level programming languages -PDP-1 and PDP-8 used assembly Time-sharing

17. University of Utah 17 17 PDP-11 First minicomputer to support high-level programming languages -PDP-1 and PDP-8 used assembly Time-sharing Watch out, mainframes!

18. University of Utah 18 18 PDP-11 Look at manuals

19. University of Utah 19 19 PDP-11: Notables UNIX was implemented on a PDP-11 -(okay, it was actually a PDP-7)

20. University of Utah 20 20 PDP-11 Gallery

21. University of Utah 21 21 PDP-11 Gallery

22. University of Utah 22 22 PDP-11 Gallery

23. University of Utah 23 23 “Test Question” On a scrap of paper, write a question that encapsulates one of the points from today's class, and turn it in. (Put your name on it!)‏