Categories
Hardware

The RC2014 Computer

While at Liverpool Makefest last June, I bought myself a kit to build an RC2014 Z80-based computer.

The kit was very well made, with high quality circuit boards which accepted solder very easily, along with sufficient documentation to make the whole building process smooth and enjoyable.

I found the process quite educational too, as the design of the kit splits out the various functions of a computer into separate boards which then plug into a backplane with a common bus linking the parts together. It was good to see how the CPU, ROM, RAM, Clock and I/O all work together to make a functional microcomputer.

I was able to talk to the RC2014 from another computer over a serial connection, but I found I got the real ‘retro’ feel when I added the RC2014 ‘video card’ – which is a serial terminal based on a Raspberry Pi Zero. This meant I could plug my creation into a monitor and keyboard without the need for a separate computer, making the whole thing into a self-contained 8-bit microcomputer.

I also added an I/O board of LEDs and switches so I could interact with the computer without the need for a monitor or keyboard.

My RC2014 incrementing binary numbers…

You can purchase a kit yourself or find out more about this little marvel at this website.

Categories
Stuff

Liverpool Makefest

I took the boat from the Isle of Man to Liverpool for the day, to visit Makefest in Liverpool.

This was a great day out, and I saw loads of good things. The highlights were:

  • Having my portrait drawn from a webcam by a DIY plotter made from DVD drives
  • An impromptu meeting with lots of northern Things Network groups
  • Seeing an RC2014 computer (and then buying one!)
  • Spending too much money on loads of bits and bobs from ABX-Labs store.

Found some nice food and real ale in a pub later in the afternoon, and the sea was flat calm on the way home so it was pretty much a perfect day out!

Categories
Stuff

Leaving Twitter

When I joined Twitter in 2009, it was a place to find interesting people sharing interesting ideas and learning from one another.  You could ask questions on very technical topics, and people would take the time to reply in detailed and thoughtful ways.

Over time, more and more people joined and the conversations grew. Twitter became my default source of news. I could get answers to problems and queries of a far better quality than I ever could with an algorithmic search engine. I was also able to help out other people by replying to their queries too. It was a place of learning, sharing and growing together.

Sadly as with everything in the modern world, capitalism takes over. Nobody sees the value in something unless it makes money, and while I long for the day when we realise as a species that this love of wealth creation doesn’t do us any good in the long run, Twitter decided to jump in with both feet. And so it was that I started seeing ‘promoted’ tweets. I called them adverts.

Businesses rushed into the space. At first as a communications channel with their customers, but it wasn’t long before they too fell into the capitalist trap and started pretend conversations talking about their products and services and employing people to tweet and re-tweet their messages.

Early on in the life of Twitter, you could ‘favourite’ a tweet. A way of bookmarking tweets which you wanted to come back to later.  Maybe they were ones which contained a useful tip, or a link to another article somewhere that you would read later. Twitter killed this by renaming a favourite to a ‘like’ (complete with new childish animations), and users from other social networks where likes were common brought their own bad habits with them. Proper conversation suffered, and the atmosphere changed. Things were now stuck in a  rut. Tweet -> like -> dead-end.

As recent years have passed I’ve witnessed a gradual decline in the quality of conversations. There has also been a real polarisation of opinions (regardless of subject) and many Twitter users seem incapable of independent thought now. They just follow their own tribes in terms of political or social views and vehemently attack anyone who dares to suggest an alternative world view.

The nail in the coffin for me was Twitter’s change to its privacy policy, which meant that they would no longer honour the ‘do not track’ setting in my browser and would begin to track my movements across the internet on other sites outside of Twitter. That’s not the attitude of a company that cares about its customers or values their privacy.

So, I’m out. I don’t think I’ll miss it at all.

Photo credit: REUTERS/Dado Ruvic

Categories
Amateur Radio Hardware

SharkRF OpenSpot

I’ve been having a lot of success using my MD380 DMR transceiver together with the Isle of Man’s DMR repeater network. Sadly though, my house isn’t in coverage of the repeaters. This means I can’t use my handheld at home.

The solution to this problem has come in the form of a Radio/IP gateway called the OpenSpot, and manufactured by SharkRF.

This allows my DMR radio to send packets to global DMR networks (Brandmeister, DMR+ etc.) and for incoming packets to be sent to my radio over RF.  Essentially it’s like having my own DMR ‘repeater’ at home so that I can use my handheld radio on all of the global networks as if I was in coverage of a DMR repeater.

Configuration was easy, via an HTTP web interface. Once set up, all the control can be done from the radio. Linking and unlinking can be done by sending group calls to specific talkgroups which means there’s no need to keep using a computer to use the device. All you need is your handheld radio.

I’ve been impressed with the build quality, the support forums, and the constant releases of new firmware with new features. I haven’t tried it yet, but it should be possible to use my OpenSpot to also communicate on the non-DMR D-STAR and System Fusion networks too, even though I only have a DMR radio. You can’t even do that with a full on DMR repeater!

Categories
Amateur Radio

Losing yourself…

About once every year, I like to log in to Ofcom’s website and re-validate my amateur radio licence. I do this so that it becomes a sort of habit, and so that I’ve no risk of going beyond the statutory five year limit.

This year, my login details didn’t work. It turns out that Ofcom have upgraded their online systems and I need to re-register. Provided that I use the same email address, they’ll match up all of my details.

Or so the theory goes. Sure enough, the system found my name and my address without issue, but sadly not my amateur radio licence. Instead, I’m now the holder of an old club callsign which I used to use when running a radio club at a school in England about 16 years ago. My actual licence and callsign is nowhere to be seen.

This matters, and not just for the legal reasons of needing to have a licence to transmit. To radio amateurs, your callsign is your name. It’s your identity. It’s how people recognise you. It matters when it’s gone. That’s why the right to personal identity is recognised in international law through a range of declarations and conventions.

Anyway, I’ve spoken to Ofcom on the phone today. Twice. They’re very polite and helpful people, but they can’t fix it for me. I’m waiting for a call back at some point today.

I don’t like being an unnamed, stateless individual. I want my identity back!