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Morgan Stanley used a variant of APL called A+. It was used quite extensively in parts of the firm. They open-sourced it a while back. http://www.aplusdev.org/

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I don't remember details, but my colleagues at Merrill Lynch used to say you could look at somebody's APL code and tell if they came from Sharp (Toronto), IBM (Yorktown Heights or San Jose CA), STSC or Morgan Stanley.

In APL2, the equivalent to a lisp map was "each", it was a colon rotated to be horizontal and superscript. We used to have "each" contests, I always got destroyed.

And one of my (distant) friends got a summer job in high school, working for Iverson in Yorktown Heights, writing APL.

What was the difference between code from Sharp, IBM, STSC and MS?

Probably a great internal tool at Morgan Stanley. I haven't heard of anyone outside of them using it seriously, but I could be wrong.

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