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This is a really great article, I really enjoyed the part that covers APL*PLUS/PC and APL2 which we can still use today; unfortunately it's likely that the mainframe implementations of APL are no longer available.

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The source code for APL\360 was published by the Computer History Museum. People have gotten this to run under Hercules. https://computerhistory.org/blog/the-apl-programming-languag...

Mainframe APL2 is still marketed I think

Ah that's true, and it's worth mentioning Jürgen Winkelmann's mvt4apl project. https://web.archive.org/web/20221120082731/http://wotho.ethz...

Volvo has been migrating from IBM mainframe APL implementations within I think last decade or so?

I think they moved to Dyalog APL (modern commercial Windows implementation of APL) many years ago. You can find plenty of Volvo presentations on their inventory system on Dyalog's website. That doesn't mean that they don't still have some mainframe thing going on.

Yes, I was kinda referring to that as the minimum extant timeframe of IBM APL being around because of that.

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