My TI-85 story. While I was in prison, around 1996 or 1997, I found out a friend had a TI-85 calculator. I realized it was programmable, so I borrowed it over the weekend and wrote a program to track his stock portfolio. It was the first time I had programmed anything in 2 or 3 years.
Then I learned that the US Bureau of Prisons had a rule against any calculator (or device) that was "programmable". So I programmed the TI-85 so its startup screen read, "TI-85 NON-PROGRAMMABLE CALCULATOR". Problem solved.
You're a hero of mine so here is my story.
Me in math class in 1996 - I had a TI-82 things are programmable so I have no formal education, my parents are illiterate, and taught myself to program, and I begged them to buy me one.
I spent time learning how to code on it, writing from scratch, the game Spyhunter.
I couldn't figure out how to draw with lines or pixels so I used ASCII or text.
I presented this to my teacher who told me "these aren't for games". I was crushed.
The fact that you made a game on a device that "wasn't for games" is even cooler.
Seems like everyone has such a story about a teacher. „No you can’t read more advanced books because the current ones bore you“ etc etc
What is the matter with these people.
rigidity
Personally betting on the "crab bucket" mentality.
What a shit teacher: "No, don't be creative and learn. Do only as you're told."
Would you be open for an online coffee sometime? Your life sounds wild.
You sir are the hardest person on HN
Perhaps this is a foolish question: how did your friend actually use the tracker? Did he input the prices from the newspapers or TV news?
I'm not sure how much he actually used it after I wrote it for him, to be honest! But we did have access to daily newspapers, and some of us got weekly stock charts called "Daily Charts" by Investor's Business Daily (all paper, of course). Some of us were into trading stocks (this was during the Internet boom 1995-2000). Another weird skill I learned that is still useful to this day.
How long were you locked up in the clink for? Did you get any access to computers there? How did your time there affect you or change how you think? Thanks for sharing
I served 60 months of the 70 month sentence. I had a computer restriction, so I couldn't be around a computer.
Since I wasn't able to use computers or the Internet for that time, I did/read/learned a lot of things I wouldn't have otherwise learned. Learned how to make hooch (prison wine), how the law works and how to maneuver the court system (useful for both civil and criminal cases), got more fluent in French by speaking with some native French speakers from Benin, learned how to work out & lift weights (which I still do), and learned the value of freedom.
> First person banned from the Internet
Legend.
Indeed.
70 months, or 5.83 years
I feel like there’s a blog post in here somewhere…!
I should do an AMA at some point. There was a pseudo-AMA on reddit a while back: https://www.reddit.com/r/bestof/comments/1z0yx7/first_person...
They had TI-85's in late '90s? I remember there only being TI-83s.
They did! The TI-89 is how I aced the AP Math exam.
The TI-92 had recently come out, and it had a QWERTY keyboard and could solve symbolic calculus problems like "find the derivative of 2x^3". This was a problem for the AP exam, since you could just type in the problem and get the answer. They fixed this by banning calculators with QWERTY keyboards. That's just about exactly when the TI-89 came out, which also did symbolic calculus but did not have a QWERTY keyboard, and so it was totally allowed on the exam. Boom, 5/5 exam score for Jorji.
Got the 89 first year it came out, loaded a periodic table on it and used it on my high school chemistry exam. Teachers had no clue back then
The -85 was released in 1992, iirc it's TI's second graphing calculator. The -83 is a later model.
I was told that one of the designers graduated high-school in '81 and college in '85, so the HS calculator was an 81 and the college calculator was an 85.
The order was:
TI-81 (1990)
TI-85 (1992)
TI-82 (1993)
TI-80 (1995)
TI-92 (1995)
TI-83 (1996)
TI-86 (1996)
TI-73 (1998)
TI-83 Plus (1999)
TI-89 (1998)
TI-92 Plus (1998)
TI-83 Plus Silver Edition (2001)
TI-84 Plus (2004)
TI-84 Plus Silver Edition (2004)
Anyone here have an idea why the models jumped around like that? Like why'd the 82 come out after the 85, or the 83 after the 92?
They had different models with different capabilities. As they made minor style changes, they bumped the numbers slightly. The 81–82–83–84 were basically the same concept, as were the 85–86. The 89 and 92 were higher-end models. The 80 and 73 are simpler models intended for middle school.
All of them are basically a multi-generational scam perpetrated against the hapless parents of American high school students who were told that they needed to buy overpriced anachronistic calculators for their kids to succeed in school. In my opinion the calculators have overall caused more pedagogical harm than benefit; the students would be better served by some combination of (a) problems that can be solved without the tedious but trivial numerical calculations these calculators support, or (b) are solved using a real programming language. If someone really wants to assign simple numerical problems, give the kids slide rules.
Calculators of this type used to make sense for an engineer doing work in the field somewhere, but make no sense in the context of a classroom.
The scam doesn’t just work in the US. In The Netherlands most secondary school students had, and I think still have, to buy these. I imagine in other countries too.
There is an interesting side effect from having always used TI calculators. They use a dot as the decimal separator, not a comma like we do here. There is usually some option to switch, but the hardware button obviously stays the same, so I’ve always been taught to just make that switch in my head, and it has become the natural thing for me to do. I see 1,000.50 on a screen I write down 1.000,50. When I use software that uses a comma as the decimal separator, I get annoyed and it takes some mental effort to enter the right values.
Huh. I have only good memories of this calculator. Would buy for my kids in a heartbeat. The fact that it barely changed is a feature to me. I know exactly what they’d be getting.
> scam
… that continues no matter what. I gave my kid my 89 from the late 90s—I was happy to avoid the TI student tax. Then a year or two back, the college board banned the 89 from certain tests/classes and so I had to cough up for an 84. Even if you take care of your stuff, treat it well to pass on to your kids, the Man finds a way to extract their cut.
I think you can flash a TI83 Plus ROM to a TI73 by using an exploit? One exploit was that flashing an OS writes all the ROM, then checks the signature afterwards, then erases it if it fails. Pull batteries at the correct time and...
One other factor that others haven't yet covered is that the different lines had different capabilities, e.g. the T-89 had Computer Algebra System symbolic manipulation meaning it could pretty much solve many types of math problems on its own, so it wasn't generally allowed in school. And then the Ti-85/86 was a step down, but had matrix support that the lower models lacked, so it was necessary for some specific types of classes.
My favorite was always the TI-85/86 line. I loved those F1-F5 buttons right beneath the screen, which made the interface overall better to navigate. The first programming I ever did was on one of those (either the 85 or 82, can't exactly remember at this point which I owned first). And, the only thing of note I ever had stolen from me was a TI-82, taken out of my unattended backpack by another student during gym class :( (And I had even carved my name into the back of it with a knife, so it would've been identifiable.)
They were different lines. The numbers aren't mean to be chronological; similar to how AMD released some 5000 series AM4 Ryzen chips long after they'd moved on to AM5 and 7000/9000 series.
TI83 (1996) was a successor to the TI82 (1993) which was a refresh/update of the TI81 (1990).
TI85 (1992) was the second model they made, originally intended as a higher end version of the TI81.
Similar reasoning for the rest of their line up. Different models had different features, and then those models would get incremental updates/refreshes over the years.
I wasn't part of the team or anything, so if anyone has any insight to why exactly they called it that in the first place, I'd be interested to know, but generally speaking the answer is: When they released the first one in 1990, they didn't name it under the presumption that this family of devices would be a staple educational/academic electronics device for the next 3 decades with dozen(s?) of different iterations/generations over the years.
A lot of it had to do with capability. The TI 92 was considerably more capable than the 83. The 89 had better software than the 92 but with a smaller form factor. The 92+ was the 92 with the 89 software.
The encyclopedia of TI calculators is http://www.datamath.org
Joerg Warner has been collecting them exhaustively, and peering inside for date codes and such.
If anybody here can illuminate where these names came from, I'd love to know!
That's such a fantastic story.
Love this
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this made me giggle lol
