[TUHS] Circuit design tool mentioned in AT&T Unix promotion

[Clem Cole]

I had to get off my mobile and to real network connection - here is the
URL: https://www.tuhs.org/Archive/Applications/Circuit_Design/
ᐧ

On Fri, Feb 10, 2023 at 8:20 AM Clem Cole <clemc at ccc.com> wrote:

> FYI: The sources to CDL are in the TUHS archives.
>
> On Fri, Feb 10, 2023 at 7:56 AM Douglas McIlroy <
> douglas.mcilroy at dartmouth.edu> wrote:
>
>> 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 at 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
>>
> --
> Sent from a handheld expect more typos than usual
>
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