Håkon Robbestad Gylterud

This is my public diary.

2017 2018 2019 2020
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March March March
April April April
May May May
June June June
July July
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September September September
October October October
November November November November
December December December December

2021–01–17, Sunday

Met John online for some virtual board-gaming. Ended up playing Paleo, a cooperative game where you fight mamoths and complete a cave painting. I liked that the cards with thing you encounter used the rules to enforce the fantasy. Like the Dodo going extinct if you hunt it, or when encountering a bush with berries you can choose between harvesting it lightly, or completely including getting the wood from the bush – again resulting in extinction. These things are not highlighted by words, it is simply expressed in the symbol language of the rules. Thus, decoding the “hidden” message is a fun extra curricular activity.

Painting of a dodo head by Cornelis Saftleven (1607-1681) from 1638

2021–01–25, Monday

The beginning of a busy week.

2021-02-03, Wednesday

Played D&D today with Andreas and Inna. Classic D&D non-sense where the heroes has to stop an occult rite which threaten to ressurect Hanu, The King of Death.

2021-02-04, Thursday

Wrote some fiction based on yesterday’s D&D session. Just a small excerp showing one of the NPCs perspective. Might post it here later, once I have edited it a bit.

2021-02-08, Monday

Listening to music in the evening when I have a bit of time for myself. A little while ago I got a new pair of head-phones (Seinheiser HD 560S) which revived my music listening quite a bit. And by that I mean that I got back into listening to music. I often have music on while I do other things – even video calls. But that is very different from actually listening, which cannot be done while done while doing something else.

So, lately I had fallen out of habit of listening to music – being all busy and that. But getting the new head-phones pushed me to listen again.

And one thing I noticed with the 560S is that the increadible separation of sounds you get on them makes it possible for to enjoy things I found really difficult to listen to previoulsly (such as The Residents’ album mentioned later). Some things, however, does not get any easier to listen to. Nirvana, for instance, is completely lost on me…

Another thing I noticed sometimes, when listening to vocals: I feel like I am standing in front of the vocalist, close to their mic-stand, staring at their mouth as they sing. Maybe this is because I have been recording my lectures this fall, and gotten interested in audio technology.

Duck stab!

Anyways, what am I listening to? Today it was:

Also, while doing the dishes I put on (not listened to), Miles Davis – Round About Midnight, which makes me feel like a civilised, modern person.

2021-02-12, Friday

Every weekday, I go for a stroll in the morning. Today was no exception even though the thermometer claimed -10°C outside – which I think is the coldest we have had here in Bergen since I arrived. This is the third week with good winter weather.

2021-02-16, Tuesday

Yesterday, the weather turned into something more recognisable for Bergen: +2°C and sleet. The ground is still cold, though, and when the snow melts and water runs down the street it freezes. On my daily walk today I saw a man have a quite nasty fall on one of the resulting ice sheets.

2021-02-22, Monday

Returning from Stord, where we spent the weekend with my parents.

This term I am working 20%, being 80% on parental leave. Lately my work time has gone into Myott – a framework for dependently typed specifications. Together with Elisabeth Bonnevier, I am improving the code base and making it easier to work on the project. Today, I restructed the program som that it is possible to run different subcommands from the CLI.

2021-03-14, Sunday

Power consumption. My computer has quite a few USB periferals, and sometimes the way they are plugged into the various ports causa a lack of power to run them all. What is the proper way to deal with that?

Universal Serial Bus

For instance, yesterday I was going to scan a “character sheet” I had made for my eldest’s imaginary robot friends. But for some reason the scanner1 would only show up for a couple of seconds, and then dissappear from lsusb. I tried all the different USB ports, but to no avail. Then I noticed that I had forgotten to connect the external power to my USB hub. Lo and behold – the scanner worked again!

Now, forgetting to connect the external power to the USB hub is obviously a mistake2. But why did none of the front-side ports give enough power? How many amps are actually available? How much does each device draw? Should I put up a budget?

If you go look up USB power, you find that USB power is measured in “units” of power, by which they mean sometimes 100 mA and other times 150 mA. And there are low-power devices (1 unit) and high-power devices (5 or 6 units). But how many units do I have avaiable?

The ideal would be if there was a led somewhere to indicate if the USB was having problems delivering enough power. Would that be possible?

2021-03-25, Thursday

Held a talk today for the HoTTEST seminar. I talked about Myott, which is what I will be working on, together with Elisabeth, once I get back to a normal work rythm.

2021-04-09, Friday

Watched a video with Brian May, of Queen fame, about the production of Bohemian Rhapsody. Nice to get a peek behind the curtain on how they worked with the audio, and structured the recordings.

Today, the snow we had over the last few days melted. The last couple of years we had snow in May, but perhaps this batch will be the last of this year.

The view from our balcony yesterday. [Zoom in! 🔍]

2021-04-27, Tuesday

Almost let out the magic smoke of a Eurorack module today.

I was connecting a Doepfer A-134-1 module to my rack today. And when connecting a module there is one mistake you can make, which will destroy your module: connecting the power cable the wrong way. If you do that, there is a very good chance that when you turn on power you will hear the crack of electric components burning out, and you can say bye-bye to your module.

Doepfer modules are kind of unique, in that there is no indication how to connect the cable, neither on the board nor in the manual. So, the common wisdom is “red-stripe down”. But for some reason the power connector on the A-134-1 is rotated 90°. So there is no up or down.

Of course my guess was incorrect, and my module had its head on the guilioutine. Luckly I had watched mylarmelodies’ video, and had my eyes on the power LEDs when flipping the switch. Only a flicker of light, no steady light – flip the flipping switch back! So, by reacting within a second, the module was saved. Later, I did some more digging and found a picture showing the correct orientation.

From this picture I was able to glean the correct orientation of the A-134-1 power connector.

2021-05-12, Wednesday

Today was the the kindergarten surrogate 17th of may celebrations. Parents keept their distance, watching the children march around from outside the fence.

A COVID-19 perspective on 17th of May [Zoom in! 🔍]

After watching the little parade, I went for a walk in the sunny May weather. We took our usual route up to Montana, and stopped on a playground.

Spring flowers all around. [Zoom in! 🔍]

It has been a while since I got to do any photography, but since I had my camera with me I took some pictures on our way.

Self portrait. [Zoom in! 🔍]

  1. Fujitsu ScanSnap s1300i, works like a charm if you actually give it power, even on Linux.↩︎

  2. This is however an easily made mistake, since there is no LED to indicate power, and many periferals will work fine on the unpowered hub. Before the scanner, my MIDI controllers were happily doing their job on the hub.↩︎

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