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Date: Tue, 22 Oct 2019 09:36:13 -0400 (EDT)
From: jnc@mercury.lcs.mit.edu (Noel Chiappa)
Subject: Re: [TUHS] What was your "Aha, Unix!" moment?
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    > From: Sean Dwyer

    > chdir seems to be a syscall in 7 (sys4.c)

It's been a system call forever, see e.g.:

  https://minnie.tuhs.org//cgi-bin/utree.pl?file=V1/man/man2/chdir.2

(And the working dir was a property of the process, not data in the shell.)

     Noel