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Re: Fwd: Toronto: APL@50

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  • joshbensadon
    ... I intend to go. But then again, it s 10 minutes away from my place. My big event will be to come to VCF East in May!
    Message 1 of 31 , Oct 5, 2012
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      --- In midatlanticretro@yahoogroups.com, Evan Koblentz <evan@...> wrote:
      >
      > See below, from cctalk.
      >
      >
      > -------- Original Message --------
      > Subject: Toronto: APL@50
      > Date: Thu, 4 Oct 2012 01:39:37 -0500
      > From: Jason T <silent700@...>
      > Reply-To: General Discussion: On-Topic and Off-Topic Posts
      > <cctalk@...>
      > To: General Discussion: On-Topic and Off-Topic Posts
      > <cctalk@...>
      >
      >
      >
      > Hello language fans - I've been notified that the folks at York
      > University in Toronto are celebrating the 50th anniversary of the APL
      > programming language on November 1 of this year. The event is
      > dedicated to the 50th anniversary of APL and will include invited
      > lectures, exhibits, demos, movies, etc.
      >
      > They sent me a PDF flyer which I have posted here:
      >
      > chiclassiccomp.org/apl50invite.pdf
      >
      > Too far and too soon for me but I hope someone on the list can make it!



      I intend to go. But then again, it's 10 minutes away from my place.

      My big event will be to come to VCF East in May!
    • Bill Dromgoole
      ... Yes, In my opinion you are correct. In the early years of semiconductors most parts have three digit date codes. You have to know the approximate decade
      Message 31 of 31 , Oct 18, 2012
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        >
        > Here's a transistor with 430 on it. Would that make it 1964, week 30?
        > Transistor part number is 2N1218. Or does the 430 refer to the factory the
        > transistor was made? or other?
        >
        > Photo of transistor posted in the photos/Josh Bensadon folder of this group.
        >
        > I've seen some IC's with only a 3 digit code on them (not part of this analog
        > computer). Case in point is the following:
        >
        > CD4023BE
        > RCA H 650
        >
        > Is that to mean 1976 week 50?
        > H being the factory where it was made?
        >
        > Cheers,
        > Josh
        > ------------------------------------

        Yes, In my opinion you are correct.
        In the early years of semiconductors most parts have three digit date codes.
        You have to know the approximate decade the part was first produced to get the
        correct date.

        Sometimes you have trouble telling the part number apart from the date code.
        In the 1970s a lot of the 7400 series ic's had date codes like 7414 and a part
        number like 7404.
        I was always having trouble with those.

        A good history of early transitor marking can be found here.
        http://transistorhistory.50webs.com/index.html

        billdrom
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