I'm fairly sure Thompson wrote it on sabbatical in Berkeley. I think he also wrote the first version of a Pascal compiler.

Pascal isn't a difficult language but I remember that compiler having an unusual style. I think others reworked it significantly later,

so if it's there at all it's worth looking at the earliest possible one.

On Mon, Feb 22, 2021 at 8:37 PM Lyndon Nerenberg (VE7TFX/VE6BBM) <lyndon@orthanc.ca> wrote:

tlaronde@polynum.com writes:

> There are various versions of an APL interpreter and, amongst these,
> a version by Ken Thompson, Ross Harvey, Douglas Lanam.
>
> Is that this one you are looking for?

That sounds like the one. It's entirely possible the version I
started with came from one of the BSD tapes (we were source
licensed so we had the full set of tapes from V6 onwards).

I have the CSRG CD set, but it's in a box in a storage locker
right now. Is there any chance you could pull the above APL
source files and leave them someplace I could grab them from?
(9p.io would work fine.)

Thanks!

--lyndon

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