APL Campfire: Difference between revisions

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[[File:APL Campfire Logo.png|thumb|right|[[humour#apples|Humorous]] promotional logo.]]
[[File:APL Campfire Logo.png|thumb|right|[[humour#apples|Humorous]] promotional logo.]]
The '''APL Campfire''' is a recurring meeting hosted by [[Adám Brudzewsky]] every fourth Sunday at 18:00 UTC, since 9 May, 2021, with each session lasting about an hour. The event focuses on the history of APL programming, inviting participants to tell stories of their experiences in an informal setting. The meetings are recorded for future reference.<ref>[https://www.youtube.com/playlist?list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv YouTube playlist]</ref>
The '''APL Campfire''' was a recurring meeting hosted by [[Adám Brudzewsky]] every fourth Sunday at 18:00 UTC, from 9 May 2021 until 12 June 2022, switching to an irregular schedule after that. Each session is about an hour. The event focuses on the history of APL programming, inviting participants to tell stories of their experiences in an informal setting. The meetings are recorded for future reference.<ref>[https://www.youtube.com/playlist?list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv YouTube playlist]</ref>


APL Campfires are held using [[wikipedia:Zoom (software)|Zoom]]:
APL Campfires are held using [[wikipedia:Zoom (software)|Zoom]]:


* '''Meeting ID:''' [https://us02web.zoom.us/j/83123786010 831 2378 6010]
* '''Meeting ID:''' [https://us02web.zoom.us/j/83123786010 831 2378 6010]
* '''Passcode:''' The result of [https://tryapl.org/?clear&q=%C3%97%2F1966%2011%2027&run <source lang=apl inline>×/1966 11 27</source> evaluated as APL]
* '''Passcode:''' The result of [https://tryapl.org/?clear&q=%C3%97%2F1966%2011%2027&run <syntaxhighlight lang=apl inline>×/1966 11 27</syntaxhighlight> evaluated as APL]


== History ==
== History ==
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! Date !! Speakers !! Subjects discussed !! text-align:center | Recording
! Date !! Speakers !! Subjects discussed !! text-align:center | Recording
|-
|-
| May 9 || Harry J. Saal, Joel Wittenberg, Adám Brudzewsky || APL on mainframes, <source lang=apl inline>⎕FMT</source>'s  <source lang=apl inline>G</source>,<ref>"Joel Wittenberg made critical assessments of that design and suggested important  
| May 9 || Harry J. Saal, Joel Wittenberg, Adám Brudzewsky || APL on mainframes, <syntaxhighlight lang=apl inline>⎕FMT</syntaxhighlight>'s  <syntaxhighlight lang=apl inline>G</syntaxhighlight>,<ref>"Joel Wittenberg made critical assessments of that design and suggested important  
elaborations which were incorporated in later designs." [[Adin Falkoff]]: ''[https://doi.org/10.1145/800142.805342 A pictorial format function for patterning decorated numeric displays]''. [[APL81]].</ref> and more || ―
elaborations which were incorporated in later designs." [[Adin Falkoff]]: ''[https://doi.org/10.1145/800142.805342 A pictorial format function for patterning decorated numeric displays]''. [[APL81]].</ref> and more || ―
|-
|-
| Jun 6 || Joel Wittenberg, Ron Murray || Murray's history with APL, including [[APL/700]] and the [[APL Machine]], and at Microsoft. Wittenberg's early exposure to [[Iverson Notation]] and [[PAT]]. || [https://www.youtube.com/watch?v=GlUa1vz2OSM&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:06:28]
| Jun 6 || Joel Wittenberg, Ron Murray || Murray's history with APL, including [[APL/700]] and the [[APL Machine]], and at Microsoft. Wittenberg's early exposure to [[Iverson Notation]] and [[PAT]]. || [https://www.youtube.com/watch?v=GlUa1vz2OSM&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:06:28]
|-
|-
| Jul 4 || [[wikipedia:Len Shustek|Len Shustek]], Joey Tuttle, Joel Wittenberg || Shustek at [[IBM]], Standord, SLAC, making APL\360 a multi-user system, running it under other OSs, [[wikipedia:https://en.wikipedia.org/wiki/OS/360_and_successors#MFT|MFT]] & (Experimental) [[wikipedia:https://en.wikipedia.org/wiki/OS/360_and_successors#MVT|MVT]], the [[wikipedia:Computer History Museum|Computer History Museum]], [[APL.SV]], [[Phil S. Abrams]] || [https://www.youtube.com/watch?v=q1MqfzilWX0&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:06:24]
| Jul 4 || [[wikipedia:Len Shustek|Len Shustek]], [[Joey Tuttle]], Joel Wittenberg || Shustek at [[IBM]], Standord, SLAC, making APL\360 a multi-user system, running it under other OSs, [[wikipedia:https://en.wikipedia.org/wiki/OS/360_and_successors#MFT|MFT]] & (Experimental) [[wikipedia:https://en.wikipedia.org/wiki/OS/360_and_successors#MVT|MVT]], the [[wikipedia:Computer History Museum|Computer History Museum]], [[APL.SV]], [[Phil S. Abrams]] || [https://www.youtube.com/watch?v=q1MqfzilWX0&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:06:24]
|-
|-
| Aug 1 || [[Gitte Christensen]]<ref>2016 [[Iverson Award]] winner.</ref>, Joey Tuttle, Joel Wittenberg || Working at [[IPSA]], [[Ian Sharp]], [[666 BOX]] (early email), MagicStore, meeting people online (including [[Morten Kromberg]]), Christensen's first APL application, [[APL conference]]s, the [[boxed]]/[[nested]] split, [[Ken Iverson]]'s [[Rationalized APL]] and [[J]], the [[Rank operator]], [[IBM]]/Insight Systems/[[Adaytum]]/Cognos/Dyadic Systems/[[Dyalog Ltd.]], [[Alex Morrow]] || [https://www.youtube.com/watch?v=OAu03M5fLck&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:06:22]
| Aug 1 || [[Gitte Christensen]]<ref>2016 [[Iverson Award]] winner.</ref>, [[Joey Tuttle]], Joel Wittenberg || Working at [[IPSA]], [[Ian Sharp]], [[666 BOX]] (early email), MagicStore, meeting people online (including [[Morten Kromberg]]), Christensen's first APL application, [[APL conference]]s, the [[boxed]]/[[nested]] split, [[Ken Iverson]]'s [[Rationalized APL]] and [[J]], the [[Rank operator]], [[IBM]]/Insight Systems/[[Adaytum]]/Cognos/Dyadic Systems/[[Dyalog Ltd.]], [[Alex Morrow]] || [https://www.youtube.com/watch?v=OAu03M5fLck&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:06:22]
|-
|-
| Aug 29 || [[Ray Polivka]]<ref>1990 [[Iverson Award]] winner and co-author of three authoritative APL textbooks.</ref>, [[Jon McGrew]], [[Joey Tuttle]], Walter Fil, Joel Wittenberg || [[ILLIAC]], at [[IBM]], [[wikipedia:Fred Brooks|Fred Brooks]], [[Adin Falkoff]], [[APL\360]], [[wikipedia:IBM 7030 Stretch|IBM 7030 Stretch]], [[IVSYS/7090]], [[Ken Iverson]], [[wikipedia:Science Research Associates|Science Research Associates]], [[wikipedia:computer assisted instruction|computer assisted instruction]], [[wikipedia:IBM 1500|IBM 1500]], teaching APL, [[books]] (own and others'), [[SIGAPL]], [[wikipedia:SHARE (computing)|SHARE]], [[APL conference]]s, [[Iverson Award]], [[Garth Foster]], [[APL Quote Quad]], [[Minnowbrook]], upcoming fourth book, [[APL 5100]], <source lang=apl inline>)MSG</source>, [[wikipedia:MCM/70|MCM/70]] || [https://www.youtube.com/watch?v=w1VMeSzJLyE&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:47:56]
| Aug 29 || [[Ray Polivka]]<ref>1990 [[Iverson Award]] winner and co-author of three authoritative APL textbooks.</ref>, [[Jon McGrew]], [[Joey Tuttle]], Walter Fil, Joel Wittenberg || [[ILLIAC]], at [[IBM]], [[wikipedia:Fred Brooks|Fred Brooks]], [[Adin Falkoff]], [[APL\360]], [[wikipedia:IBM 7030 Stretch|IBM 7030 Stretch]], [[IVSYS/7090]], [[Ken Iverson]], [[wikipedia:Science Research Associates|Science Research Associates]], [[wikipedia:computer assisted instruction|computer assisted instruction]], [[wikipedia:IBM 1500|IBM 1500]], teaching APL, [[books]] (own and others'), [[SIGAPL]], [[wikipedia:SHARE (computing)|SHARE]], [[APL conference]]s, [[Iverson Award]], [[Garth Foster]], [[APL Quote Quad]], [[Minnowbrook]], upcoming fourth book, [[APL 5100]], <syntaxhighlight lang=apl inline>)MSG</syntaxhighlight>, [[wikipedia:MCM/70|MCM/70]] || [https://www.youtube.com/watch?v=w1VMeSzJLyE&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:47:56]
|-
|-
| Sep 26 || Andy Shiers<ref>At Dyadic Systems since 1987, now Dyalog's Chief of Operations.</ref> and [[Geoff Streeter]]|| 40 years of Dyalog APL, early days of [[Dyadic Systems]] || [https://www.youtube.com/watch?v=xjgkqmRJrPc&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:05:42]
| Sep 26 || Andy Shiers<ref>At Dyadic Systems since 1987, now Dyalog's Chief of Operations.</ref> and [[Geoff Streeter]]|| 40 years of Dyalog APL, early days of [[Dyadic Systems]] || [https://www.youtube.com/watch?v=xjgkqmRJrPc&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:05:42]
|-
|-
| Oct 24 || [[Jim Brown]], Ron Murray || Early days at [[IBM]] and [[Syracuse University]]. Discussions with [[Ken Iverson]] and [[Adin Falkoff]], extending [[decode|base value]] (<source lang=apl inline>⊥</source>) and [[Encode|represent]] (<source lang=apl inline>⊤</source>) to work on higher [[rank]] arrays. Ragged [[array]]s vs [[nested array]]s. <source lang=apl inline>⎕AX</source> as prototyping too; to switch axiom system for enclosing a scalar. Origin of [[wikipedia:foo|foo]] as a placeholder name in programming. Resistance to APL at IBM. Interesting internal applications at IBM: a stock application (still in use today) and QMF (Query Management Facility). Using APL for models of [[primitive]]s and extensions. Behaviour of [[outer product]] (<source lang=apl inline>∘.</source>), [[strand notation]], [[prototype]]s for [[each]] on [[empty array]]s, [[system label]]s. [[NARS2000]]'s ball arithmetic. Differences in floating point results of APL vs [[wikipedia:PL/I|PL/I]] implementations of IBM's internal planning system. The meaning of [[monadic]] [[Up Arrow]] (<source lang=apl inline>↑</source>) and [[Right Shoe]] (<source lang=apl inline>⊃</source>). Influence from [[wikipedia:Lisp (programming language)|Lisp]]  ([[first]] as <source lang=apl inline>↑</source> and "last" as <source lang=apl inline>↓</source>), symbols, Mike Jenkins's [[Matrix Inverse]] and [[Matrix Divide]] (<source lang=apl inline>⌹</source>), Disjoined arrays using a dedicated Disjoined Array Computer (DAC), hardware [[APL machine]]s/processors, [[shared variable]]s. || [https://www.youtube.com/watch?v=eFtO_vtCNEw&t=259s&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:26:13]
| Oct 24 || [[Jim Brown]], Ron Murray || Early days at [[IBM]] and [[Syracuse University]]. Discussions with [[Ken Iverson]] and [[Adin Falkoff]], extending [[decode|base value]] (<syntaxhighlight lang=apl inline>⊥</syntaxhighlight>) and [[Encode|represent]] (<syntaxhighlight lang=apl inline>⊤</syntaxhighlight>) to work on higher [[rank]] arrays. Ragged [[array]]s vs [[nested array]]s. <syntaxhighlight lang=apl inline>⎕AX</syntaxhighlight> as prototyping too; to switch axiom system for enclosing a scalar. Origin of [[wikipedia:foo|foo]] as a placeholder name in programming. Resistance to APL at IBM. Interesting internal applications at IBM: a stock application (still in use today) and QMF (Query Management Facility). Using APL for models of [[primitive]]s and extensions. Behaviour of [[outer product]] (<syntaxhighlight lang=apl inline>∘.</syntaxhighlight>), [[strand notation]], [[prototype]]s for [[each]] on [[empty array]]s, [[system label]]s. [[NARS2000]]'s ball arithmetic. Differences in floating point results of APL vs [[wikipedia:PL/I|PL/I]] implementations of IBM's internal planning system. The meaning of [[monadic]] [[Up Arrow]] (<syntaxhighlight lang=apl inline>↑</syntaxhighlight>) and [[Right Shoe]] (<syntaxhighlight lang=apl inline>⊃</syntaxhighlight>). Influence from [[wikipedia:Lisp (programming language)|Lisp]]  ([[first]] as <syntaxhighlight lang=apl inline>↑</syntaxhighlight> and "last" as <syntaxhighlight lang=apl inline>↓</syntaxhighlight>), symbols, Mike Jenkins's [[Matrix Inverse]] and [[Matrix Divide]] (<syntaxhighlight lang=apl inline>⌹</syntaxhighlight>), Disjoined arrays using a dedicated Disjoined Array Computer (DAC), hardware [[APL machine]]s/processors, [[shared variable]]s. || [https://www.youtube.com/watch?v=eFtO_vtCNEw&t=259s&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:26:13]
|-
|-
| Nov 21 || Zbigniew "Ziggy" Stachniak<ref>Computing historian, associate professor of computer science at York University in Toronto, and author of [https://www.google.co.uk/books/edition/Inventing_the_PC/cyWOA2FED7EC?hl=en Inventing the PC].</ref>, [[CoSy|Bob Armstrong]] || Timeline leading to [[MCM/70]]:[[wikipedia:Mers Kutt]], [[York APL]], [[wikipedia:Intel 8008|Intel 8008]], [[APL '73]], [https://www.youtube.com/watch?v=AaQdzKnOxJE speed of <source lang=apl inline>0.7÷⍳255</source>], battery-operation, European tour and selling [https://www.youtube.com/watch?v=tcxXxAxxL5I the computer as a personal calculator], users of MCM/70, [[IBM]] possible "inspiration" to create the [[APL 5100|IBM 5100]], the display technology, the applications libraries including [https://www.youtube.com/watch?v=YitUfJySYz4 games], [https://museum.eecs.yorku.ca/ York University Computer Museum], using APL for arts, [https://museum.eecs.yorku.ca/mcm70e the MCM/70 emulator]. || [https://www.youtube.com/watch?v=QA9XymS-vho&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:09:21]
| Nov 21 || Zbigniew "Ziggy" Stachniak<ref>Computing historian, associate professor of computer science at York University in Toronto, and author of [https://www.google.co.uk/books/edition/Inventing_the_PC/cyWOA2FED7EC?hl=en Inventing the PC].</ref>, [[CoSy|Bob Armstrong]] || Timeline leading to [[MCM/70]]: [[wikipedia:Mers Kutt|Mers Kutt]], [[York APL]], [[wikipedia:Intel 8008|Intel 8008]], [[APL '73]], [https://www.youtube.com/watch?v=AaQdzKnOxJE speed of <syntaxhighlight lang=apl inline>0.7÷⍳255</syntaxhighlight>], battery-operation, European tour and selling [https://www.youtube.com/watch?v=tcxXxAxxL5I the computer as a personal calculator], users of MCM/70, [[IBM]] possible "inspiration" to create the [[APL 5100|IBM 5100]], the display technology, the applications libraries including [https://www.youtube.com/watch?v=YitUfJySYz4 games], [https://museum.eecs.yorku.ca/ York University Computer Museum], using APL for arts, [https://museum.eecs.yorku.ca/mcm70e the MCM/70 emulator]. || [https://www.youtube.com/watch?v=QA9XymS-vho&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:09:21]
|-
|-
| Dec 19 || [[Charles Brenner]] || [[Larry Breed]], [[wikipedia:Roger Moore (computer scientist)|Roger Moore]], [[IBM]] at [[wikipedia:Yorktown Heights, New York|Yorktown Heights]], [[Ken Iverson]]'s [[A Programming Language]], [[Adin Falkoff]], [[Eugene McDonnell]], [[APL\360]], implementing (high-rank) [[Transpose]] and [[Rotate]] with APL models, [[wikipedia:Imlac PDS-1|Imlac]], [[APL\1130]], the [[wikipedia:modem|modem]] precursor, generating poetry by sampling trigrams, [[STSC]], [[Roy Sykes]], optimised transpose of [[Boolean]] arrays, [[Bob Bernecky]], [[wikipedia:John Gilmore (activist)|John Gilmore]], [[control structure]]s, [[APL00|APL2000]], [[John Scholes]], [[Roger Hui]], [[IPSA]], [[dfns.dws]], [[wikipedia:IBM 650|IBM 650]], uses of APL, forensic mathematics, [[Adrian Smith]] || [https://www.youtube.com/watch?v=mmEtMrBikT0&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:13:16]
| Dec 19 || [[Charles Brenner]] || [[Larry Breed]], [[Roger Moore]], [[IBM]] at [[Watson Research Center|Yorktown Heights]], [[Ken Iverson]]'s [[A Programming Language]], [[Adin Falkoff]], [[Eugene McDonnell]], [[APL\360]], implementing (high-rank) [[Transpose]] and [[Rotate]] with APL models, [[wikipedia:Imlac PDS-1|Imlac]], [[APL\1130]], the [[wikipedia:modem|modem]] precursor, generating poetry by sampling trigrams, [[STSC]], [[Roy Sykes]], optimised transpose of [[Boolean]] arrays, [[Bob Bernecky]], [[wikipedia:John Gilmore (activist)|John Gilmore]], [[control structure]]s, [[APL00|APL2000]], [[John Scholes]], [[Roger Hui]], [[IPSA]], [[dfns.dws]], [[wikipedia:IBM 650|IBM 650]], uses of APL, forensic mathematics, [[Adrian Smith]] || [https://www.youtube.com/watch?v=mmEtMrBikT0&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:13:16]
|}
|}


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| Apr 10 || [[Adám Brudzewsky]] || Growing up with APL as a "natural language", using list arithmetic to implement Boolean array logic. || [https://www.youtube.com/watch?v=qsMvlUJBuY0&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 01:10:44]
| Apr 10 || [[Adám Brudzewsky]] || Growing up with APL as a "natural language", using list arithmetic to implement Boolean array logic. || [https://www.youtube.com/watch?v=qsMvlUJBuY0&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 01:10:44]
|-
|-
| May 8<ref>Arranged in cooperation with with [[APL BUG]]. </ref> || Paul Jackson<ref>Was mentioned multiple times by David Selby</ref> || ||
| May 8<ref>Arranged in cooperation with with [[APL BUG]]. </ref> || Paul Jackson<ref>Was mentioned multiple times by David Selby</ref> || [[wikipedia:PL/I|PL/I]], [[wikipedia:IBM 2741|IBM 2741]], testing arguments in lack of error trapping, "broken keyboard" exercises (implementing [[primitive]]s in terms of others), [[ngn/apl]] and [https://github.com/plj541/APL.js his extensions to it], [[Ken Iverson]], writing various programs, comparison of typewriter terminals like [[wikipedia:IBM 3270#APL_/_APL2|IBM 3270]], "STAPLE" (Strutured APL Extensions) compiling [[control structure]]s to [[branch]]ing, [https://www.microapl.com/apl_help/ch_070_100.htm auxiliary processors], [[wikipedia:MVS|MVS]], [[SAX]], [[Dfn]], evolution of [[J]], [[Variant]], [[Index origin]], modern times. || [https://www.youtube.com/watch?v=65HOCGnLNXk&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 02:39:02]
|-
| Jun 12<ref>Note: One week later than usual.</ref> || Paul Jackson || Floating point computations, [[typing APL glyphs]], [[fonts]], [[SAX]], [[J]], [[running APL]] and J online. || [https://www.youtube.com/watch?v=aECx5M590u0&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 01:43:11]
|}
== 2023 ==
{| class=wikitable style=width:100%
| Mar 12 || Norman Thomson<ref>Author of ''APL Programs for the Mathematics Classroom'' and co-author, with R. Polivka of ''APL2 in Depth''.</ref> || [[IBM]] in Hursley, use of computers, [[wikipedia:PL/I|PL/I]], language of reasoning, teaching APL, catergories of APL users, the importance of grasping the concept of [[rank]], [[APL2]], anecdotes from [[APL conference]]s, [[wikipedia:Eigenvalues_and_eigenvectors|Eigen analysis]], [[J]] demonstration of computing and using Eigen values || [https://www.youtube.com/watch?v=jPujK-GvHGQ&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:21:52]
|}
|}


Latest revision as of 23:39, 15 April 2024

Humorous promotional logo.

The APL Campfire was a recurring meeting hosted by Adám Brudzewsky every fourth Sunday at 18:00 UTC, from 9 May 2021 until 12 June 2022, switching to an irregular schedule after that. Each session is about an hour. The event focuses on the history of APL programming, inviting participants to tell stories of their experiences in an informal setting. The meetings are recorded for future reference.[1]

APL Campfires are held using Zoom:

History

The series started after Joel Wittenberg contacted Dyalog Ltd., wanting to reconnect with the APL community. He started the APL Dinosaurs Facebook group, and suggested a live meeting. Via Zoom, he met with his friend Harry Saal and Dyalog employee Adám Brudzewsky for an hour on May 9, 2021. The meeting was deemed so enjoyable, that the group decided to make it a scheduled recurring event.

2021

Date Speakers Subjects discussed Recording
May 9 Harry J. Saal, Joel Wittenberg, Adám Brudzewsky APL on mainframes, ⎕FMT's G,[2] and more ―
Jun 6 Joel Wittenberg, Ron Murray Murray's history with APL, including APL/700 and the APL Machine, and at Microsoft. Wittenberg's early exposure to Iverson Notation and PAT. 1:06:28
Jul 4 Len Shustek, Joey Tuttle, Joel Wittenberg Shustek at IBM, Standord, SLAC, making APL\360 a multi-user system, running it under other OSs, MFT & (Experimental) MVT, the Computer History Museum, APL.SV, Phil S. Abrams 1:06:24
Aug 1 Gitte Christensen[3], Joey Tuttle, Joel Wittenberg Working at IPSA, Ian Sharp, 666 BOX (early email), MagicStore, meeting people online (including Morten Kromberg), Christensen's first APL application, APL conferences, the boxed/nested split, Ken Iverson's Rationalized APL and J, the Rank operator, IBM/Insight Systems/Adaytum/Cognos/Dyadic Systems/Dyalog Ltd., Alex Morrow 1:06:22
Aug 29 Ray Polivka[4], Jon McGrew, Joey Tuttle, Walter Fil, Joel Wittenberg ILLIAC, at IBM, Fred Brooks, Adin Falkoff, APL\360, IBM 7030 Stretch, IVSYS/7090, Ken Iverson, Science Research Associates, computer assisted instruction, IBM 1500, teaching APL, books (own and others'), SIGAPL, SHARE, APL conferences, Iverson Award, Garth Foster, APL Quote Quad, Minnowbrook, upcoming fourth book, APL 5100, )MSG, MCM/70 1:47:56
Sep 26 Andy Shiers[5] and Geoff Streeter 40 years of Dyalog APL, early days of Dyadic Systems 1:05:42
Oct 24 Jim Brown, Ron Murray Early days at IBM and Syracuse University. Discussions with Ken Iverson and Adin Falkoff, extending base value (⊥) and represent (⊤) to work on higher rank arrays. Ragged arrays vs nested arrays. ⎕AX as prototyping too; to switch axiom system for enclosing a scalar. Origin of foo as a placeholder name in programming. Resistance to APL at IBM. Interesting internal applications at IBM: a stock application (still in use today) and QMF (Query Management Facility). Using APL for models of primitives and extensions. Behaviour of outer product (∘.), strand notation, prototypes for each on empty arrays, system labels. NARS2000's ball arithmetic. Differences in floating point results of APL vs PL/I implementations of IBM's internal planning system. The meaning of monadic Up Arrow (↑) and Right Shoe (⊃). Influence from Lisp (first as ↑ and "last" as ↓), symbols, Mike Jenkins's Matrix Inverse and Matrix Divide (⌹), Disjoined arrays using a dedicated Disjoined Array Computer (DAC), hardware APL machines/processors, shared variables. 1:26:13
Nov 21 Zbigniew "Ziggy" Stachniak[6], Bob Armstrong Timeline leading to MCM/70: Mers Kutt, York APL, Intel 8008, APL '73, speed of 0.7÷⍳255, battery-operation, European tour and selling the computer as a personal calculator, users of MCM/70, IBM possible "inspiration" to create the IBM 5100, the display technology, the applications libraries including games, York University Computer Museum, using APL for arts, the MCM/70 emulator. 1:09:21
Dec 19 Charles Brenner Larry Breed, Roger Moore, IBM at Yorktown Heights, Ken Iverson's A Programming Language, Adin Falkoff, Eugene McDonnell, APL\360, implementing (high-rank) Transpose and Rotate with APL models, Imlac, APL\1130, the modem precursor, generating poetry by sampling trigrams, STSC, Roy Sykes, optimised transpose of Boolean arrays, Bob Bernecky, John Gilmore, control structures, APL2000, John Scholes, Roger Hui, IPSA, dfns.dws, IBM 650, uses of APL, forensic mathematics, Adrian Smith 1:13:16

2022

Jan 16 Curtis Jones, André Orlans, Harry Saal, Adám Brudzewsky Early days of APL. Does APL (still) have a niche? 1:07:40
Feb 13 Curtis Jones, Jon McGrew Drawing graphs of magnetic bubble memory using the 20 PLOT and 10 FINEPLOT workspace, getting the APL2 idiom list released to to SIGAPL, making TryAPL2 free for schools, computing the decay time of voic coil motors, communicating with the HP-IB, liaising between IBM departments that produced APL code, Ray Polivka's roles, editing APL Quote Quad, golfing the implementation of Conway's Game of Life, David Liebtag marking session text for execution, GRAPHPAK, STARMAP. 1:20:21
Mar 13 David Selby[7], Jon McGrew IBM Havant, speeding up Grade using radix sort, APLSV, self-learning APL, "hacking" APLSV, implementing auxiliary processors in assembly language, including AP124 for screen control, Norman D. Thomson, APL83, implementing APL for IBM System/7 and IBM Series/1 in APL/IL (Intermediate Language; an APL-like low-level macro language), Adin Falkoff, working on large data, compiling IL to RISC, the IBM APL Community, extensive internal uses of APL at IBM, APL conference disks inspired by Mike Cowlishaw, improving APL/PC, Japanese APL, hardware, IBM bureaucracy, porting APL2 to the PC, Jim Brown, the APL2 logo, porting APL2 to IBM RT PC, migrating (partially) from IL to C, comparison with other programming languages, regrets, notable personalities, Diamond 2:07:47
Apr 10 Adám Brudzewsky Growing up with APL as a "natural language", using list arithmetic to implement Boolean array logic. 01:10:44
May 8[8] Paul Jackson[9] PL/I, IBM 2741, testing arguments in lack of error trapping, "broken keyboard" exercises (implementing primitives in terms of others), ngn/apl and his extensions to it, Ken Iverson, writing various programs, comparison of typewriter terminals like IBM 3270, "STAPLE" (Strutured APL Extensions) compiling control structures to branching, auxiliary processors, MVS, SAX, Dfn, evolution of J, Variant, Index origin, modern times. 02:39:02
Jun 12[10] Paul Jackson Floating point computations, typing APL glyphs, fonts, SAX, J, running APL and J online. 01:43:11

2023

Mar 12 Norman Thomson[11] IBM in Hursley, use of computers, PL/I, language of reasoning, teaching APL, catergories of APL users, the importance of grasping the concept of rank, APL2, anecdotes from APL conferences, Eigen analysis, J demonstration of computing and using Eigen values 1:21:52

Notes

  1. ↑ YouTube playlist
  2. ↑ "Joel Wittenberg made critical assessments of that design and suggested important elaborations which were incorporated in later designs." Adin Falkoff: A pictorial format function for patterning decorated numeric displays. APL81.
  3. ↑ 2016 Iverson Award winner.
  4. ↑ 1990 Iverson Award winner and co-author of three authoritative APL textbooks.
  5. ↑ At Dyadic Systems since 1987, now Dyalog's Chief of Operations.
  6. ↑ Computing historian, associate professor of computer science at York University in Toronto, and author of Inventing the PC.
  7. ↑ One of the highest level Data Scientists in IBM; Principal Data Scientist and Master Inventor for IBM Weather Business Solutions, AI Applications Cloud and Cognitive Software. Developed APL/PC and APL2/PC.
  8. ↑ Arranged in cooperation with with APL BUG.
  9. ↑ Was mentioned multiple times by David Selby
  10. ↑ Note: One week later than usual.
  11. ↑ Author of APL Programs for the Mathematics Classroom and co-author, with R. Polivka of APL2 in Depth.


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