What's the next thing we must do to move this forward? Shall we schedule the TTL logic demo prototype class?

I am aware that this class doesn't go into FPGA concepts yet, but is designed to teach us hardware and logic.

Does it require purchase of materials first, or do we have everything we need for like 3 of us to do the demo in a prototype session?

I hereby take the great liberty of suggesting we do the TTL logic demo prototype class session on Thursday, 4/30, 6:30-9pm! Can you do that time Larry, David, Angela, Arik, and anyone else interested? Larry if that time does not work for you, would you suggest a time?

Let's settle on Thursday, May 7!!!!! AWESOME have a wonderful time out there, take pics of your travels and regale us with stories plz! On Wed, Apr 15, 2026 at 13:35 Larry Doolittle <larry(a)doolittle.boa.org> wrote: > Judy - > > On Wed, Apr 15, 2026 at 12:24:52PM -0700, Judy Tuan via sudo-discuss wrote: >> What's the next thing we must do to move this forward? Shall we schedule >> the TTL logic demo prototype class? > > Thanks for jumping in and suggesting something concrete! > I bet that's what we need. > >> I am aware that this class doesn't go >> into FPGA concepts yet, but is designed to teach us hardware and >> logic. > > Right. I'm not sure how much clock-time any of this will take, > but I have a pretty clear plan for about three lessons, and > the TTL protoboard step is the first. When David and I went through > it, it took some extra time because we were still scrounging for parts. > We probably took two hours, and I left him with an extra-credit homework > puzzle. > >> Does it require purchase of materials first, or do we have >> everything we need for like 3 of us to do the demo in a prototype session? > > I think we have the parts. > >> I hereby take the great liberty of suggesting we do the TTL logic demo >> prototype class session on Thursday, 4/30, 6:30-9pm! Can you do that time >> Larry, David, Angela, Arik, and anyone else interested? Larry if that time >> does not work for you, would you suggest a time? > > I do more traveling now that I'm retired. I plan to be out-of-town > for that whole week, roughly Apr 27 - May 4. In general I can be > available almost any day/time of the week. So, how about Thursday May 7? > > Moving the time away from the high-commotion Tue and Wed evenings > seems like a good plan, assuming the interested people can make it. > > - Larry

Arik - On Wed, Apr 15, 2026 at 10:30:45PM +0000, arik via sudo-discuss wrote: into? Maybe review the basic vocabulary of Boolean logic. What do AND and OR and NOT really mean? How do you express those as a truth table? My outline of lessons is: 1. Boolean logic expressed with electronics, specfically TTL gates and wires. We'll hook up switches and LEDs and see the logic happen. 2. Repeat the experiments of (1) with an FPGA substituting for the TTL gates. Needs a computer (laptop) running yosys and nextpnr-ice40. Debian Trixie is known good, and a recent Ubuntu should also be easy. If you prefer something else, LMK and I can work with you ahead of time to get the toolchain installed. I'll supply the $50 pico2-ice FPGA board. 3. Synthesize and run clocked logic to create sounds; based on the fpga4fun MusicBox lesson at https://www.fpga4fun.com/MusicBox.html . - Larry _______________________________________________ sudo-discuss mailing list -- sudo-discuss(a)sudoroom.org To unsubscribe send an email to sudo-discuss-leave(a)sudoroom.org More options at https://sudoroom.org/lists/postorius/lists/sudo-discuss.sudoroom.org/