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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 || ―
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| 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 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]
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| 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 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]
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| 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 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]
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| 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 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]], <source lang=apl inline>)MSG</source>, [[wikipedia:MCM/70|MCM/70]] || [https://www.youtube.com/watch?v=w1VMeSzJLyE&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:47:56]
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| 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 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]
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| 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 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]] (<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]
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| 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 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]], [[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]
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| 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 1:13:16]
| 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]
|}
|}


== 2022 ==
== 2022 ==
{| class=wikitable
{| class=wikitable
| Jan 16 || Curtis Jones, André Orlans, Harry Saal, Adám Brudzewsky || Early days of APL. Does APL (still) have a niche? || [https://www.youtube.com/watch?v=PibXdJerG1k 1:07:40]
| Jan 16 || Curtis Jones, André Orlans, Harry Saal, Adám Brudzewsky || Early days of APL. Does APL (still) have a niche? || [https://www.youtube.com/watch?v=PibXdJerG1k&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:07:40]
|-
|-
| Feb 13 || TBD || TBD ||
| Feb 13 || Curtis Jones, Jon McGrew || Drawing graphs of magnetic [[wikipedia:bubble memory|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 [[wikipedia:voic coil|voic coil]] motors, communicating with the [[wikipedia:HP-IB|HP-IB]], liaising between IBM departments that produced APL code, [[Ray Polivka]]'s roles, editing [[APL Quote Quad]], [[code golf|golfing]] the implementation of [[Conway's Game of Life]], David Liebtag marking session text for execution, GRAPHPAK, STARMAP. || [https://www.youtube.com/watch?v=_jBQ53cRi0s&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 1:20:21]
|-
|-
| Mar 13 || TBD || TBD ||
| Mar 13 || David Selby<ref>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.</ref>, Jon McGrew || IBM Havant, speeding up [[Grade]] using [[wikipedia:radix sort|radix sort]], [[APLSV]], self-learning APL, "hacking" APLSV, implementing [[auxiliary processors]] in [[wikipedia:assembly language|assembly language]], including AP124 for screen control, [[Norman D. Thomson]], [[APL83]], implementing APL for [[wikipedia:IBM System/7|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 [[wikipedia:RISC|RISC]], the IBM APL Community, extensive internal uses of APL at IBM, [[APL conference]] disks inspired by [[wikipedia:Mike Cowlishaw|Mike Cowlishaw]], improving APL/PC, Japanese APL, hardware, IBM bureaucracy, porting [[APL2]] to the PC, [[Jim Brown]], the APL2 logo, porting APL2 to [[wikipedia:IBM RT PC|IBM RT PC]], migrating (partially) from IL to C, comparison with other programming languages, regrets, notable personalities, [[Diamond]] || [https://www.youtube.com/watch?v=a65K-0jaWc4&list=PLYKQVqyrAEj91hZHbJiWOENHZP4JT8VFv 2:07:47]
|-
| 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> || [[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]
|-
| Jul 3 || TBD || TBD || TBD
|}
|}


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<references/>
<references/>


{{APL community}}[[Category:Online sessions]]
{{APL community}}[[Category:Online sessions]][[Category:Web broadcasts]]
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