I loved the video. I had an HP11C, then an HP41CV, an HP48SX, an HP50G, an HP Prime, an HP35S, an HP15C, etc. With the ban on cell phones, we will see a return of calculators to classrooms, including engineering courses. Swiss Micro should grow in the market with the abandonment of HP. HP lost a fundamental niche, as calculators are the gateway to brand loyalty.

Excellent video on the subject getting me up to date. No more slide rules and CRC Handbook look up tables. I pretty much stopped at HP-15c. TI SR-50 was my first couldn't afford the HP-35. I now have a collections of HPs including the 35 and HP 50g. No idea how to use the 50g, getting into the owner's manual later. Too bad RPN going out of favor.

Great documentary. Thank you !

I lost count of the number of calculators I have. There can be computers, spreadsheets, mobile phones and the hell with numbers... I just love calculators in general. Of my favourites I even have multiples, like the HP-15c or the Casio fx-570ms or the TI-89. There is nothing better than a literal physical calculator to crunch numbers! This was an excellent video, thank you for it!

Not sure how I ended up here, but I found this very interesting. I still use my HP-41CV that is now 40 years old.

Thank you! Better than my professors

Starts talking about Sonic at 7:45 Good talk, thanks for sharing

BAD! i cannot listen it calmly -the pronunciation of Daphne Preston-Kendal is just terrible. i have a speech defect myself [i cannot pronounce "l" because i have a mutilation], but i do not pretend on giving any lectures. the subject is just great, she is just not confident or maybe is unprepared to the talk. cannot listen to this syncopation babbling

please replay

with out using robot how to make navigation map in indoor

I wasn't sure how we are supposed to subtract with the compometer gizmo, but 10's complement will always work, just like how computers use 2's complement. e.g. 23+76+1=100, ignore the carry. I notice that the calculator has the complements on the digits, e.g. 1 has an 8. This works fine, you enter 23, then enter the complement which is 76, then add 1.

Hi Jacob, once the 7,1,8 & 2 are entered, you say you will guess from there but be prepared to back-track. But what if the 7,1,8,2 configuration itself doesn't allow for any feasible solutions? Don't you have to be ready to backtrack all the way? i.e. there is no set number of initial guesses that you can assume for feasibility.

Thanks so much for this!

This video was awesome! I've been getting into Racket and thought I'd see what's going on with R7RS. Did not expect such a good introduction into the history of Scheme.

Great job explaining these topics!

A lot of people left were not racist and not trump followers. They felt the site should be inclusive as not all trump supporters are racist! I'm a Democrat.

thanks for sharing

CLP(QR) does floating point domains.

17:40 How does floating point numbers lead to infinite domains?

Great video i hope after a while guile moves to r7rs but I fucking love guile

awesome talk! I'm glad my silly little meme inspired you so much :3

Even for people that never made any money on rav... some people were so badly affected that they had to take time off work, in some cases very long periods, and/or pay for medical care. 'If you don't have the money to hire an accessibility expert, you don't have the money to redesign.' Darn right!!! If the whole situation weren't so horrible, it would actually be impressive. I've never seen a site cause such an incredible amount of physical harm.

I am someone who started using Ravelry in 2009. The redesign gave me a migraine as soon as it rolled out - I was on the website browsing patterns as it changed, and was not seeing any reactions in the forums or the like. What truly irritated me was not the initial accessibility failure - it was the doubling down, refusal to admit anything was wrong, and trying to paint all the harm Ravelry has done as "stress" causing the issues. Their entire response and ignoring users disgusted me, and I delisted my patterns for sale / download on their website. The only functionality I use now is adding my new patterns to the site, but linking to my own shop instead of uploading anything to Ravelry itself. They have shown how little they care.

A point of clarification with the R-team's statement that signups were up 106% over the previous year. You were correct in pointing out that this put them in comparison to the month in 2019 when they included support of the president as support of racism, but after they did that they closed signups for a month so non-knitters who were offended by the ban couldn't create new or puppet accounts and cause a ruckus. So Ravelry was bragging that sign-ups were up compared to a period when they didn't allow signups. That's disingenuous at best.

Yes, thank you so much for delving into this and really articulating a lot of what happened! It's been a mess for me as a knit/crochet designer (I'm finally able to use NewRav with a custom CSS sheet on top of it, to avoid headaches/nausea/disorientation). I've got a question, if you don't mind? It's a question about something you didn't mention; that I'm curious about: In later social media posts, Ravelry used Twitter (and IG)'s option to remove the ability to comment. I'd be curious to know if this impacted your study at all?

Aside from the awful accessibility issues (the new site gave me a migraine in 15 minutes flat, along with eye strain which lingered for a week, and was certainly not mass hysteria since I had been browsing patterns and so had not seen any forum posts complaining of issues) there are a number of side issues with the new design which also caused anger and disengagement. One, as mentioned above, was the site having a more strongly feminine feel instead of the "gender-neutral" feel they claimed to have aimed at. Another was that the new design was very cutesy and young-feeling, likely to appeal to Gen Z but an odd choice here since the overall user profile skews strongly Gen X/older Millennial - this has alienated a lot of the "old guard" who have been Ravellers since its inception, and feel pushed aside. And also, the new site was designed to work and look good on mobile phones, and "broke" in numerous ways for tablet users - eg vast amounts of whitespace, or click buttons being outside the pop-up box they should be in - many of these bugs have not been fixed months later. Also, they were told about the accessibility issues by at least one beta tester, but went ahead anyway. I still use Ravelry daily with the old skin, but who knows if I'll be able to continue after they retire that skin in March. At least two of my Rav communities have set up Zoom and Discord groups so we can keep in touch if it all goes tits-up next spring - this is the level of community cohesion that Ravelry is squandering.

I'm one of those who are unable to use Ravelry any more. It was a nightmare before. But for the record, it's NOT a voluntary run community - this is a business charging designers to advertise their patterns, and taking a cut from sales. It is absolutely not voluntary. There is a large crossover between Twitter and Ravelry - and NuRav has helped this grow. All people wanted from Ravelry was an acknowledgement of the issues people were experiencing; the chance to roll back (which finally came around some weeks later, but which is due to end soon); and an apology that accessibility, by Ravelry's own admission, was only considered at the end of their programming, and not right at the beginning. Ravelry has instead doubled-down and there has been no sincere apology. Many designers and users have left the community as a result. And hey, the world hasn't ended. But for many crafters, Ravelry was home.

Interesting talk, which I watched as an interested knitter rather than a coder. From my own POV I think the mass hysteria charge is despicable (& agree with you about its inherent misogyny) and also untrue. I was turning the brightness down on "Nu Rav" long before I even saw any accusations of accessibility issues from others, when I thought I was just in the group that thought the whole thing horribly twee but would basically have to put up with it! I'm just lucky that a headache was the worst outcome for me. The other point that I think has contributed to the feelings of betrayal is linked to this idea of Ravelry as "free". Many of us have made donations over the years and there's also a fee if you want to upload pics other than on project pages. But the main thing is that Ravelry has, since its inception, made huge use of volunteers to overcome the problem of having basically one person doing all the coding - Cassidy. Volunteers sorted all the patterns into categories for example, there are loads of volunteer editors and volunteers also moderate most of the forums. Members have worked hard to build the site and saved the founders lots of money in the process. This has, I believe, left people far more invested in the site than in many - most? - others. There also definitely were several accessibility experts (self described, but apparently genuine) offering their services to help correct the problems and all seemingly ignored. It didn't help that the person hired to make the site's appearance over did not appear to be either an accessibility expert or even a knitter, which given a pool of very artistic people at their fingertips feels again like a rejection by Ravelry of the community. Ravelry is not going to disappear any time soon, but they have lost an awful amount of goodwill. Where in recent times potential competition has struggled, there's now a fertile ground for someone. Many designers are looking for other places to sell patterns - which is probably positive, as having all their eggs in one basket clearly was a mistake. But every time a You Tube video maker says "I haven't linked to Ravelry" it feels so sad. It was all so unnecessary.

Nice overview. And yes, a great case study of what NOT to do. A couple small corrections, however. Rav isn't a volunteer-run site, The folks running it make a living doing so. Also, there's not a dev team of 6. One full-time dev, 1 part-time dev. The others on staff are in the operations/community aspects of things. Unfortunately, an analysis based off Twitter is a small and skewed sampling as there's little crossover between Rav and Twitter. Some things that factored into a majority-negative response were 1. no warning whatsoever, new site just appeared between page navigation/refreshes, and 2. people already in a state of anxiety due to first few months of pandemic, thus not a good time to drastically change many people's safe/happy space. Based on the main board forum posts, maybe 20-30% were giving new look a thumbs up for seeming fresher/cleaner. Majority, even before the accessibility issues erupted, were disappointed in the twee/juvenile new design and puzzled that anyone thought it was more gender-neutral than original Rav (which was apparently one of the goals). But thank you for keeping this discussion going. I suspect the Rav implosion will be a case study for a while.