#relaylogic — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #relaylogic, aggregated by home.social.
-
This toot https://fosstodon.org/@interlisp/115122557055111398 led me via a reference to Edmund C. Berkeley (as coauthor with L. Peter Deutsch of "The LISP Implementation for the PDP-1 Computer", March 1964 and author of "Giant Brains, or Machines that Think", 1949) to the 1950 2-bit relay computer Simon and then to Harry Porter's Relay Computer:
https://www.youtube.com/watch?v=tsp2JntuZ3c
By eighteen minutes in, if you can follow along, you'll understand how ALU function codes are selected.
I've never seen such a succinct explanation of a computer.
[Edit: the 3-bit ALU function codes are later wrapped in 8-bit opcodes, which trigger loads and selects from the data and address buses. This is exposition at its finest!]
#computerarchitecture #relaylogic #vintagecomputing #retrocomputing
-
2025 One Hertz Challenge: 16-Bit Tower Blinks at One Hertz https://hackaday.com/2025/07/23/2025-one-hertz-challenge-16-bit-tower-blinks-at-one-hertz/ #2025HackadayOneHertzChallenge #relaycomputer #relaylogic #contests #diycpu
-
2025 One Hertz Challenge: 16-Bit Tower Blinks at One Hertz - We’ve seen our share of blinking light projects around here; most are fairly strai... - https://hackaday.com/2025/07/23/2025-one-hertz-challenge-16-bit-tower-blinks-at-one-hertz/ #2025hackadayonehertzchallenge #relaycomputer #relaylogic #contests #diycpu
-
A Clock Made Out of Electromechanical Relays - Electromechanical circuits using relays are mostly a lost art these days, but some... - https://hackaday.com/2024/02/13/a-clock-made-out-of-electromechanical-relays/ #analogclock #clockhacks #relaylogic
-
Returning to the Z80 ALU core implemented in relays. The first task is to redo the relay symbols. Kicads default generic relay shows the solenoid repelling the contacts, rather than attracting them. It's messing with my head.
In the image I've update the two symbols on the left. The rest are still defaults.
(PS Kicad only has a generic symbol for the single pole relay. I extended this to create the tow and three pole versions).
-
Hackaday Links: November 12, 2023
#hackadaycolumns #hackadaylinks #astronauts #calculator #cruise #iss #layoffs #niceroundnumbers #relaylogic #satellite #spacewalk #tire #tools #unixepoch #wagonwheel #wheel #wheelwright #hackaday
-- Delivered by RssEverything service
-
Hackaday Links: November 12, 2023
#hackadaycolumns #hackadaylinks #astronauts #calculator #cruise #iss #layoffs #niceroundnumbers #relaylogic #satellite #spacewalk #tire #tools #unixepoch #wagonwheel #wheel #wheelwright #hackaday
-- Delivered by RssEverything service
-
Hackaday Links: November 12, 2023 - Somebody must really have it in for Cruise, because the bad press just keeps pilin... - https://hackaday.com/2023/11/12/hackaday-links-november-12-2023/ #niceroundnumbers #hackadaycolumns #hackadaylinks #wheelwright #astronauts #calculator #relaylogic #wagonwheel #satellite #spacewalk #unixepoch #layoffs #cruise #tools #wheel #tire #iss
-
Hackaday Links: November 12, 2023 - Somebody must really have it in for Cruise, because the bad press just keeps pilin... - https://hackaday.com/2023/11/12/hackaday-links-november-12-2023/ #niceroundnumbers #hackadaycolumns #hackadaylinks #wheelwright #astronauts #calculator #relaylogic #wagonwheel #satellite #spacewalk #unixepoch #layoffs #cruise #tools #wheel #tire #iss
-
Hackaday Links: November 12, 2023 - Somebody must really have it in for Cruise, because the bad press just keeps pilin... - https://hackaday.com/2023/11/12/hackaday-links-november-12-2023/ #niceroundnumbers #hackadaycolumns #hackadaylinks #wheelwright #astronauts #calculator #relaylogic #wagonwheel #satellite #spacewalk #unixepoch #layoffs #cruise #tools #wheel #tire #iss
-
Hackaday Links: November 12, 2023 - Somebody must really have it in for Cruise, because the bad press just keeps pilin... - https://hackaday.com/2023/11/12/hackaday-links-november-12-2023/ #niceroundnumbers #hackadaycolumns #hackadaylinks #wheelwright #astronauts #calculator #relaylogic #wagonwheel #satellite #spacewalk #unixepoch #layoffs #cruise #tools #wheel #tire #iss
-
Hackaday Links: November 12, 2023 - Somebody must really have it in for Cruise, because the bad press just keeps pilin... - https://hackaday.com/2023/11/12/hackaday-links-november-12-2023/ #niceroundnumbers #hackadaycolumns #hackadaylinks #wheelwright #astronauts #calculator #relaylogic #wagonwheel #satellite #spacewalk #unixepoch #layoffs #cruise #tools #wheel #tire #iss
-
Relay Logic Nixie Tube Clock Checks All The Boxes - There are a few words in the electrical engineering lexicon that will perk any har... - https://hackaday.com/2021/08/09/relay-logic-nixie-tube-clock-checks-all-the-boxes/ #clockhacks #nixietubes #relaylogic #cmoslogic #hardware #relays #clock #nixie #relay #led
-
Circuit VR: Advanced Falstad Logic with Geniac - I find that if I’m trying to make a point with a student or a colleague about a circuit, sometimes t... more: https://hackaday.com/2019/08/20/circuit-vr-advanced-falstad-logic-with-geniac/ #retrocomputing #switchlogic #relaylogic #simulation #falstad #skills #geniac #logic
