Note to self: I want to get two of these: Audio Playback Adaptor for CD-ROM Drives Kit Back Catalogue and a back issue of Silicon Chip November 2007 edition. That copy of Silicon Chip has a write-up on the CD-ROM kit.
I made some new cables (the ones on the right). They’re banana plug to square socket. They complement the ones on the left, which are banana plug to pin jumper. The pin jumpers can plug into the square sockets.
I also installed the two black hooks to hang them on. The silver hook with the hot glue gun on it was already there.
For each type there are two pair of short ones and one pair of long ones.
Watched this one from Ben Eater: SPI: The serial peripheral interface. I found it while watching this one: Hacking a weird TV censoring device, which was kind of hilarious, he reverses a profanity filter and finds its dictionary.
I noticed Ben Eater has a Keysight DSOX1204G Oscilloscope, a pretty nice looking bit of kit. Oh dear, he also seems to have a Keysight DSOX4024A Oscilloscope, which is an even nicer looking bit of kit.
When I have some time I’m gonna get some of these BME280 knockoffs and see if I can play along with the SPI video.
I see Orange Pi in my future. Also of interest: LinkStar H68K. Learned about them over here: I Can Save You Money! – Raspberry Pi Alternatives.
So I installed this shelf. It’s the black wiry thing:
But it was a bit of an ordeal. I managed to snap not one, but *two* screws while bolting it in.
The drill bit on the left was a casualty of trying to repair the mess. One screw shaft was irredeemably stuck in the wood, I couldn’t get it out. The other one I needed to drill around to get it out, it was stuck hard. Then I just plugged the hole I had created with craft sticks and hot glue, then tried again.
The spirit level says I did a fairly reasonable job of it:
At last! A website that looks worse than mine: Software optimization resources.
The above resources were referenced from an article I read today: The World’s Smallest Hash Table. Also mentioned were Integer division by constants: optimal bounds and the Avalanche effect.
In cryptography, the avalanche effect is the desirable property of cryptographic algorithms, typically block ciphers[1] and cryptographic hash functions, wherein if an input is changed slightly (for example, flipping a single bit), the output changes significantly (e.g., half the output bits flip). In the case of high-quality block ciphers, such a small change in either the key or the plaintext should cause a drastic change in the ciphertext. The actual term was first used by Horst Feistel,[1] although the concept dates back to at least Shannon’s diffusion.
So here’s my weight loss since December 2021 in relative and absolute terms. The graph is the 7-day moving average. Still a long way to go!
Today’s viewing: “Clean” Code, Horrible Performance.
This one, also good: All You Need To Know About HDMI To Fix Stuff! – Port Broken No Video Picture Output Repair Replace.
In it I learned about LVDS.
There’s some interesting Fluke equipment to check out.
There’s a follow-up video here: All You Need To Know About HDMI To Fix Stuff – Reprise. How To Repair Broken No Video.