virtualagc VS op25

I don't think that's a great example.

For instance, I can step through and even modify that code using tooling like AGC emulators like this one http://www.ibiblio.org/apollo/#gsc.tab=0

What makes it open source is access to the same level of source access that the original developers worked in.

That's what's missing here. Mistral's engineers do not simply open this binary in their editor to do their job.

Glad you're enjoying the videos! I'm Mike from them. :) The Apollo 14 code I linked above was reconstructed in the same way as Luminary 69/2, but the process was far, far too involved for a video. Like I said above, I probably won't be much help with math, but I'd be more than happy to assist with finding documentation or navigating AGC code whenever you want!

The fact that all the information about the computer and software is public and you can verify it yourself like thousands of people have. https://www.ibiblio.org/apollo/

If you’re curious about the the technical specs of the AGC check out Ron Burkey’s website, it’s even got the source code for you to see for yourself: https://www.ibiblio.org/apollo/

Of course you should be able to tell us because all the hardware architecture and software can be found here. So you must have fully reviewed it and located the issues. Right? Than please point out where the error is.

It had manually encoded ROM in the form of "core rope memory", which is pretty wacky, but it was a digital computer. In fact, it was the first IC computer.

You can learn way too much about it and even operate (a simulation of) one here: http://www.ibiblio.org/apollo/

looks like it may not be able to do what I want it to do according to this. https://github.com/boatbod/op25/issues/184

I have no experience with DMR myself, but my understanding is that the Boatbod fork of OP25 has experimental DMR support, and I believe SDRTrunk software does, too.

Using OP25[1] with RTL-SDR dongles to implement scanners for trunking P25 radio systems on a computer. And as a sidebar to that, listening in on geographically remote public safety radio systems using Broadcastify[2]. It's basically the old "radio scanner" culture, but taken online and distributed worldwide. People listen to all sorts of stuff, but given my background as a former firefighter and former 911 dispatcher, my main interest is listening to public safety dispatch stuff.

That said, another commenter below mentioned modern "phreaking" and how it's become more radio centric... and while I won't admit to doing anything illegal, let's just say that there's some interesting stuff you can do / look at / listen to these days, especially with ubiquitous and inexpensive SDR hardware and related resources. See the recent story about the KrakenSDR passive radar stuff, and some of the papers that are out there about P25 security flaws, some of the automobile hacking stuff that's RF based, etc., etc. There's a fascinating world out there buzzing around on invisible electromagnetic fields... and you can tap into it with a $30 dongle and a Raspberry Pi (or your PC).

[1]: https://github.com/boatbod/op25

If it's P25 Phase I or Phase II then SDRTrunk might work. boatbod's op25 might be another option, but more complicated to set up.

I don't have a full guide for you, but I use https://github.com/boatbod/op25 for receiving and decoding P25 Phase 1 digital signals on the command line.

op25

If you are handy with Linux you can use an RTL-SDR and OP25 on a Raspberry Pi or really any PC. This is the page for the Fairfax trunked system https://www.radioreference.com/apps/db/?sid=6957. Any talkgroup with mode D can be listened to, mode DE is encrypted. If you want I already have config files made up for the police dispatch and fire/ems dispatch channels.