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I've got 2 CE's (one black one which broke, and my "signature" mint CE) and a Casio fx 115es PLUS (scientific) and a four-function (Casio SL-300SV, bought for AP Bio)

ProgrammerNerd: The abacus was a good one (I have one too Razz) but the second?! If you actually have one in your basement, that would be cool!
Hereís a pocket abacus I have in my calculator collection. You can carry it in your pocket just in case you come across a situation where you need to do some quick calculations. The abacus looks a little distorted because I had to get close for the picture. Itís also heavy because itís mounted on a 1/2Ē marble base. I think it was originally used as a paper weight.

I have

2 TI 83+
1 TI 84+CE
1 TI 86
1 TI nspire CAS

Take note that only the TI84+CE is technically "mine." (I got it for christmas)

Hereís the latest TI calculator added to my collection. Itís a TI SR 10. I was at a flea market and the seller wanted $3 for it. I figured the batteries were probably corroded and it didnít work. I noticed there was a plug for a charger, but he didnít have it. I offered $2 and he accepted. When I got home and was taking it out of the car, I noticed a 0 on the display. Apparently I left it turned on and I didnít see the 0 because we were in bright sun light when I was looking at it. When I took the back off, there were 3 regular 1.5 volt batteries. I guess I didnít need the charger anyways. I was buying it just because it was old and not for it to work. I guess I lucked out on that one.
Wow that's quite a find! Those go for ~$10-20 on ebay! You're especially lucky the batterys weren't dead. How well does it perform? Is it quick at all?
Thereís a noticeable delay for the calculations, like about 1/10 second. It also doesnít have good precision. If I take the square root of a number, then square it, the result isnít exactly what I started with. But itís OK for a 45 year old calculator. Iíll probably pull the batteries out of it and put it with all my other calculators.
Well, better late than never!

I have a TI83+ and a TI84+CE with ambitions to get a Nspire CX CAS, the Numworks calc, and the HP Prime.
I just have a normal calculator, two scientific, and then three graphing.
I used to have an abacus, but it was given to a friend.
All are in perfect working order!
I have the covers for all except the TI-82. (Though the one for the 84+CE isn't in the image.

That's actually a pretty nice little collection. I kinda want a CE.
I've gotten a lot more serious about collecting, and have acquired a lot more calculators. I mostly try to get early revisions of various calcs. I have a profile on tiplanet's collection site where I listed some of my calcs (I didn't bother listing the same calc 10 gillion times, so if I bought a classroom set, I only put one or two from the set).
Here is a link to that

One thing I've struggled with is sellers not shipping to Canada. A solution to that has been to send some calcs to non-Canadian members, specifically geekboy1011, KermMartian and Pieman7373 (Big thanks to all three of you Very Happy) and then work out how to get the calculators to me.
We arranged to meet up at Maker Faire this year, which means that I got three more calculators Razz
Here is my Maker Faire haul:

  1. Ti-nspire CAS + (PVT1.1, S-0906)
  2. Ti-92 (ROM 1.2, I-1195)
  3. Ti-92 (ROM 1.4, I-0196)

I quite like the idea of gathering all the hardware revisions of a calc, but that's still a little bit out of reach for now. Same thing for ROM revisions, except that that's even a little bit harder because you can't always tell with 100% certainty what the ROM revision of a calc is just by looking at the serial number/datecode. This means that gathering all ROM revisions could entail having to buy a few calcs to gather a single ROM revision.
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