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

Christian Dreier via TUHS tuhs at tuhs.org
Mon Feb 13 19:22:43 AEST 2023

Hello Steven,

I have questions about a logic design tool mentioned in an old Unix 
promotion by AT&T and apparently presented by you.

Do you have some information about this software? See below for further 
details about my question. See also TUHS mailing list: 

Best regards,

Am 10.02.23 um 06:36 schrieb Christian Dreier:
> 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

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