[TUHS] Circuit design tool mentioned in AT&T Unix promotion
Heinz Lycklama
heinz at osta.com
Sat Feb 11 01:22:22 AEST 2023
Speaking about Datakit, some old timers may be interested
in this online memorial for Sandy Fraser and his achievements
being held in the UK on February 15:
https://www.cst.cam.ac.uk/news/sandy-fraser-memorial-his-achievements
Heinz
On 2/10/2023 7:03 AM, Clem Cole wrote:
>
> 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
> <http://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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