My friend had a Sentry CA756, but the EXE button stopped working, and he gave it to me (but I can't fix it). These graphing calcs are about $20, with a very small screen and only 10 program spaces. Yes, 10. You reference them by using Prog, like Prog 1. It's looping capabilities are lbl, goto, ISZ, and DSZ. Sad, isn't it? And it doesn't even have a function catalog! You have to access function with a Shift- or Shift-Alpha- key sequence. To change the calc's mode, you have to press MODE, MODE-SHIFT, or MODE-ALPHA and a number.
This thing is awful! So, without further ado, here are some pix!
Here's the awful small screen and the label that tells all the calc modes.
Sorry about this one being blurry, but here's the keyboard. As you can see, almost all of the keys have SHIFT, ALPHA, and SHIFT-ALPHA labels on them.
Here's a close-up of the arrow keys. Notice how they stole the "REPLAY" and "EXE" from Casio.
The "screenshots" on the quick reference aren't even screenshots. They didn't even attempt to make them look real.
The battery. Notice how the calc only needs one battery to work, so they just glued foam to the other contact!
This is the inside of the calc.
The main (and only) chip is, of course, buried under epoxy.
Here you can see that foamed-up battery slot also has terminals running to the circuit board, just like the other one!
The only thing holding the LCD in is the back cover pressing against it. I can freely pull it out of its slot (that is too big, the LCD can wobble all around in the slot).
Another shot of the calc, this time with the LCD flopping.
You have just witnessed how awful this cheap, $20 calc actually is. It's definitely worth less than $20
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