Hi there. Not deleted by me. KZbin does this sometimes depending on content. You are right to ask about the version, this is version 6. Maybe a follow up video migrating to 9 when it comes out! thanks.

I see now on your other video you mention the Sharp Compet 32. I have never seen the insides of one of those, and I believe not many made it out of Japan. But it most likely used the same module as the Facit was based on it.

Hi, Yes they all used the same core module. Including the Sharp Compet 32(CS-32A) which i understand was the original design. Very interesting that you have the Facit 1125. Hoping to get one myself one day to reverse engineer. Good luck with it and thanks for watching.

Hi. Yes its possible. Check out the features of v7. And it may be a plugin needed to do that. Plenty of RF designs and EMI compatible projects completed with KiCad. Good luck!

totally agree - if this autorouting has taken half an hour it its a waste of time. I would had done the same job in the same time - manually. On top of that there will be at least an hour just to clean up to have decently signal routing and to have nice power planes. My 25 years old version of PADS PCB does a better autorout job in 20 minutes, and even obeys net design rules including max length diff. Power routing is poor and could easily have been routed much better manually. My judgement is that this would had been a two and a half hour job manually - placement and routing - and you would have had a much more robust power routing

I understand what you are saying, but for my project, it was just what I needed. At the very least it's another option.

Hi, the schematic symbols, also have associated ''footprints' as they are called and are all stored in the KiCad part library. When you add a part like a 74LS00, you get 4 gates, each with a letter (a,b,c,d) this indicates which gate in the package you are connecting to, and with pin numbers also shown for that gate. Those pins then translate to the PCB footprint and KiCad does that automatically once placed in the PCB layout. Hope that helps.

ha.. just go manual.

Thats pretty cool that you have the same module. These are quite rare now. Some history checking shows these came from desktop calculators from the late 60's. Would be interested if you know what it came out of in your case. Like the Sharp Compet 32(CS-32A) or 33A. But there were a few other brands using the same boards inside. Sorry to hear of your long covid. Good luck.

@@NEEC1 I worked for the Sharp dealer in the Netherlands. Didn't repair the old compet calculators so didn't know the module came from a compet. I repaired the modern calculators an cash registers. A colleage gave me the core memory module. After searching the internet some time ago I found one same module in a Japanese museum. Thanks for your reaction. Have a nice day.

Hi. Thats true for CMOS inputs where the input pins can float, putting the gate into an undetermined state. Possibly leading to some kind of oscillation. However, we are using LS series here which are not high impedance input. Its fine to not connect them in this case. They are internally biased (pull up) to high.

Arduino added!

Thats a fair comment David. I can see this being a controversial subject.

Nice, good mixture of engineering in one vid! An almost forgotten technology, created by brilliant engineers before chips and internet.

If you setup all your netlists and constraints in advance (power trace thicknesses, special signal net clearances etc) FreeRouting will take this into account and adjust accordingly.

Hi there, well thats great news. Must be very recent. I was using the latest release just a few weeks ago and it was not included. Will investigate!

Hi Michael. You are right. The video was already getting quite long and wanted to get the point. I had to miss the process of manually entering in the schematic from paper. It really is a process of getting all those bits of circuit (multiple bits of paper) and one by one entering it in. Its a process but eventually you get the whole schematic. I may do another video specifically on schematic entry if there's enough interest. Thanks. And good luck.

Hi. Yes it could have been done with a 1MHz crystal. But i chose a simple RC arrangement to do the job simply to reduce costs. And the NANDs were already there, so no need for inverters. But yes, that would have been an alternative way and much better precision for clocking frequency if it was needed. thanks.