On Wed, Jul 9, 2025, 8:42 PM Skip Tavakkolian <fariborz.t@gmail.com> wrote:

In the 2nd Edition Plan 9, in the Alef Language Reference Manual by
Phil Winterbottom, the title of section 7 is "The Plan 9
Implementation". Were there other implementations?

According to the Alef User's Guide, there was (at least) an implementation for Irix. https://doc.cat-v.org/plan_9/2nd_edition/papers/alef/ug