4 ms·
Intro to Rod Logic (2009)
- rdiddly 8y agoAnother objection to the first OR gate: it's actually an AND gate, isn't it?
- laszlokorte 8y agoYou have to imagine that the T-shape is pushed by only one of the blue rods and loses contact to the other blue rod.
- rdiddly 8y agoAha!
- red_admiral 8y agoThis kind of thing used to be used extensively in railway signal boxes, where you want to enforce safety constraints like "signal 1 clear => points (switches) 20 set to straight ahead AND signal 2 at danger". The UK version of this is called "tappet interlocking".
- delibes 8y agoWhat I find odd about this is having to push the output rod and check where it ends up. I'm not sure how this would work in a clocked/latched system, or whether that's even possible? Does it need a reset at the end of a cycle, or can it only live in a async clockless circuit? [edit] OK I searched and found that the Zuse Z1 used this system too! And had a clocking system. This page describes the same problem and has details of alternative designs : https://anthony-zhang.me/blog/rod-logic/ https://anthony-zhang.me/blog/rod-logic/