iljitsch.com

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Hi, I'm Iljitsch van Beijnum. These are all my posts that aren't work-related.

Skyline #20, regenboog-editie

Image link - posted 2023-08-27 in

SDBox: a cheap SD card adapter for your Amiga

I was watching the videos on the BBC Master computer on the Adrian's Digital Basement Youtube channel. Adrian has cleaned up this old Acorn BBC Master, restored the keyboard to full functionality and then started to "Americanize" it by changing the power supply to use 120 V, and making the composite video NTSC rather PAL.

But what really peaked my interest is that he made a tiny little interface to hook up SD cards to the Master's user port. I think it only uses four wires. There's a very small circuit board, but that only has some resistors to adapt the user port's 5 V to the 3.3 V used by SD cards. Apparently, that's all the hardware you need for reading (and writing?) SD cards. Wow.

Could this also work on an Amiga?

Full article / permalink - posted 2023-08-21

Verkiezingen komen er aan! #1

Een kleine drie weken geleden viel het kabinet Rutte-4. Sindsdien hebben premier Rutte en alle vice-premiers aangekondigd na de demissionaire periode de politiek te gaan verlaten. Twee lijsttrekkers van de verkiezingen van 2021 waren al vertrokken en nog eens drie hebben aangekondigd niet verder te gaan. We gaan de verkiezingen van 22 november dus tegemoet met een flink aantal verse lijsttrekkers.

Full article / permalink - posted 2023-07-26

My favorite pointing devices

Image link - posted 2023-05-13 in

Comparing digital and film resolution using MTF

I fell down a rabbit hole a while ago trying to come up with the definitive answer to the often-asked question "how can old movies be in HD/4K", which immediately leads to "how does film and digital resolution compare".

The answer to the first question is of course that film as a lot more resolution than standard definition TV, so just scanning the movies at a higher resolution will give you a sharper image than that old DVD or (shudder) VHS tape.

The problem with reasoning about film grain vs pixels or eyeballing images is that it's very imprecise. But we actually do have a tool that lets us compare digital vs film: the optical transfer function.

Integrated below a little tool with a slider to see for yourself where the tradeoffs are.

Read the article - posted 2023-03-29

Skyline #19

Image link - posted 2023-02-14 in

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