Stack Based Computers

Stack based computers will be the next scripted podcast for Carpetbomberz Inc.

If you don’t know what a stack-based computer is, do a Google search and apart from the Wikipedia entries on it, there’s some interesting ACM papers. For embedded CPUs that need hard real-time performance, it’s the only way to go. But what about general purpose stack-based machines? Well a company that we know so little about today, once showed the whole world the superior technology contained in the stack-based architecture. Burroughs released the B5000 mainframe back in 1963. And with that machine a number of big firsts were accomplished in the Computer industry. The first computer designed based on the software requirements for the machine. First OS written in a high level language ( version of ALGOL). The architecture still exists today in the Unisys architecture called, ClearPath. It’s definitely lasted a while.

The architect of the B5000 would eventually leave Burroughs to become a faculty member at the Computer Science Dept. at the University of Utah. And that became a hot bed for a lot of advances in Computer Graphics as it turns out. It’s amazing that the University of Utah was such a vibrant community, the way we think of Stanford U. in the early 1980’s.

I still haven’t really scripted the whole program yet. I may just launch into despite my ignorance and see what I come up with. Still I find stack-based computers endlessly fascinating.


Podcast addendum – Bomb Run 021

After posting the show and listening to it some thoughts occured to me. Stuff I would have included if it wasn’t boring or made the show go too long would have included:

References to the history of  Artificial Intelligence (AI) Research

References to Marvin Minsky and Seymour Papert’s book: Perceptrons

The role of AI Research in missile defense planning/budgets

The re-invigoration of AI Research with the missile defense program under Reagan et. al.

These topics will stay off the podcast until I get through the first round of scripted podcasts. An art professor of mine once said, “Where do you come up with all these stories?” And I looked at her, smiled a big dumb grin and said, “Oh this?! I got a million of ’em.”  So don’t be surprised if we revisit the MIT AI Lab and it’s history and contributions to the computer industry and society in general.

Bomb Run – 021 Show Notes

Full show notes for the Carpet Bomberz Inc. podcast episode #21


 Bomb Run - 021 episode art

  • Lisp Machines – The Best Computer Ever!
    • From the wikipedia article on Symbolics and LMI
    • LISt Processing Language (LISP)
      • John McCarthy created it for Artificial Intelligence research
        • Developed on an IBM 704 mainframe eventually was ported
      • Very resource intensive
      • Slowed shared machines to a crawl, making research very expensive in clock cycles
      • Slow performance led to the idea of a dedicated machine for LISP
    • The Dedicated LISP machine ’73
      • Tom Knight and Richard Greenblatt create CONS
        • Hardwired to run basic LISP operations, speeding things up because they were in hardware not software
      • CONS is further refined and becomes CADR
        • Eventually 25 machines of this design are built and sold around MIT and outside MIT
      • Russ Noftsker steps in when it’s obvious there’s a market for LISP
    • Symbolics – February ’79
      • Russ Noftsker & the largest contingent of AI hackers leave
      • Most successful of the Lisp Machine companies
      • Most innovative designs (higher performance, graphics division)
      • Dedicated graphics were adopted by Hollywood led to further use of graphics in movies
    • Lisp Machines Inc. (LMI) – October ’79
      • Richard Greenblatt
      • Smallest contingent of the AI Lab hackers followed
      • Orders were provided through Control Data Corp project trying to do AI research
    • Richard Stallman – GNU Project
      • Richard and Marvin Minsky were the only staff left after the parting of the ways
      • Saw the culture get killed by the forming of the Lisp Machine
      • GNU project formed as a response to decimation of MIT hacker ranks
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    I’ll only end up frustrated

    Chili bowlI’m sad to announce that the three stores I tried had no 3.5 quart enameled cast iron pots from Le Creuset. I tried. I even stopped off at a the local special cooking store to see what they had in stock. They had a baby 2quart pot and a 2.5 quart pot (full reactive style cast iron). So I decided, “To hell with it, I’m just going to make the recipe using a pot I already have. So I did it! I had ingredients I had been collecting since Dec. 6th when I thought I would have to cook for my wife after her stay in the hospital. Boy am I glad I waited and waited. First, I found the ultimate recipe last weekend. Then, I waited until I found the ultimate chili pot. But in waiting I gave myself enough time to purchase the last ingredients (mostly dried and ground spices). And speaking of spices, I’ve never used more spices than in the America’s Test Kitchen chili recipe. A quarter cup of chili powder, a teaspoon of red pepper flakes and a half teaspoon of cayenne pepper, all make for the darkest, richest, most flavorful chili you have ever had. I’m leaving out the rest of the spices because I don’t want to be sued by anyone. But let me tell you it is a winner. I’ve just added another easy dish to my repertoire. I may still shell out the money for a Le Creuset dutch oven, but I’m going to be back at my birthday asking for the the very pot I didn’t buy last week.


    America’s Test Kitchen Chili Recipe In Clay’s Kitchen introduced me to an important source of Cooking Knowledge. America’s Test Kitchen. And it was from this one little recipe that a whole world opened for me. I used to watch all the PBS cooking shows never once thinking I could pull off a top level recipe, but this one chili dish convinced me I could and should do it. Now I have invested in expensive bits of cookware, a Le Creuset dutch oven, an All Clad Fry pan. The rest the say is history.

    Le Creuset 7-1/4 quart French Oven
    The best pot for cooking chili - Le Creuset

    I want to thank the fellow who put the recipe out from the America’s Test Kitchen cookbookInside America’s Test Kitchen (Thanx to Clay Irving @

    I was very curious when I found ATK had a recipe for Chili. I watch the PBS show they have under the name of America’s Test Kitchen. I have only tried one recipe in the past, a chocolate chip cookie recipe for a crispy, harder cookie. It wound up not working out for me. But I have great hopes for this Chili recipe. Now the next hard step was discovering that neither my wife nor I own a non-reactive cast iron Dutch Oven. That’s right we were completely passed by the Le Creuset revolution (Vive la revolution). I had seen this item in various forms on other cooking shows but the lesson never sank in. Lidia’s Kitchen for example used the Dutch Oven for her osso bucco. It makes total sense. But trying to find a store that carries the 3.5 quart Le Creuset French Oven is almost impossible. But we may have a specialty store near our house that will have it in stock.


    Finally, a minor contribution

    One of my favorite passtimes is to listen to a podcast called the Dawn and Drew Show. And let me tell you when you join their message board you begin the understand the value of Listener Generated Content. Adam Curry has benefited from this too with his podcast Daily Source Code. I’ve sent a few emails at different times to Adam, one of which got a mention on his show. Sometimes, I fall so far behind in listening to the shows I don’t feel I can make a legitimate contribution. I’ve been doing a lot better recently keeping up with Dawn and Drew episodes so I threw together this little ditty in Photoshop:Peanuts Dawn and Drew

    Hopefully, the next step would be a good phone line comment about something happening recently in one of the episodes. But I don’t want to get ahead of myself. Little steps, little baby steps.


    Whatcha’ Gonna Do?!

    There was a time I rode the bus in Junior High School where the older black kids brought a boombox onto the bus. I didn’t have a choice but to listen. However I got so used to it being there I didn’t know I would miss it. Work yo’ body, work yo’ body, work yo’ body. All the way! Pump, pump, pump, pump, pump, pump, pump pump iit up! Those were the days. I wonder what those band names were called. I never really found out what was on those old cassette tapes. I just remember it being loud and very rhythm heavy.