From: Douglas McIlroy <douglas.mcilroy@dartmouth.edu>
To: Christian Dreier <flipper.x3r@googlemail.com>
Cc: tuhs@tuhs.org
Subject: [TUHS] Re: Circuit design tool mentioned in AT&T Unix promotion
Date: Fri, 10 Feb 2023 07:56:29 -0500 [thread overview]
Message-ID: <CAKH6PiVzeJnYmdwEp1xvEi0a-5X8fcPOYxR0T=VUT1xk8jGkpg@mail.gmail.com> (raw)
In-Reply-To: <854dfba0-6cf2-57a4-3995-c57571205d1f@googlemail.com>
CDL was for designing wired circuit boards, not integrated circuits..
It was used to design the Datakit switch, the Belle chess machine and
other hardware.
I suspect the cited IC-design tool was one that Steve Johnson created
for use in a short course that Carver Mead taught at Bell Labs. I am
not aware that it saw use outside of that course.
Doug
On Fri, Feb 10, 2023 at 12:37 AM Christian Dreier via TUHS
<tuhs@tuhs.org> wrote:
>
> Hello there,
>
> I recently watched an old Unix promotion video by AT&T on YouTube (AT&T
> Archives: The UNIX Operating System: https://youtu.be/tc4ROCJYbm0) and
> they mention a design tool for integrated circuits (apparently named
> L-Gen or lgen; timestamped link: https://youtu.be/tc4ROCJYbm0?t=1284).
>
> Part of this software is a language implemented with YACC that appears
> to describe the behavior of digital logic, like modern hardware
> description languages, i.e. Verilog and VHDL.
>
> Does anyone have information about this, in particular:
> - Documentation
> - Which projects were realized with this?
> - Source code, if possible
>
> I asked this question on retrocomputing.stackexchange.com (see
> https://retrocomputing.stackexchange.com/q/26301/26615) but so far there
> is no satisfying answer. A "Circuit Design Language" (CDL) is mentioned
> and there is some good information about it but it has another syntax
> (as shown in the video vs. the documentation about CDL) and apparently
> another purpose (description of board wiring vs. logic behavior).
>
> Best regards,
> Christian
next prev parent reply other threads:[~2023-02-10 12:56 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-10 5:36 [TUHS] " Christian Dreier via TUHS
2023-02-10 12:56 ` Douglas McIlroy [this message]
2023-02-10 13:20 ` [TUHS] " Clem Cole
2023-02-10 15:03 ` Clem Cole
2023-02-10 15:22 ` Heinz Lycklama
2023-02-10 19:08 ` Lawrence Stewart
2023-02-11 8:06 ` Christian Dreier via TUHS
2023-02-13 9:22 ` Christian Dreier via TUHS
2023-02-19 21:31 ` Christian Dreier via TUHS
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