TI calculators have an OS (operating system) that can be upgraded. To see what OS your calculator has do the following:

• Select 2nd and then mem (mem is above the + key)

• Select 1: About
• This TI-84 Plus has OS 2.55MP

• This TI-84 Plus CE has OS 5.2.1.0042

• Apparently, the newest OS for the TI-83 is OS 19

• If you have an older OS your calculator may not behave like calculators with the newest OS. Here’s one difference between older OS’s and the newer OS’s

• For some older OS’s when you enter a number and then press ^ you can only enter one digit. So, for example if you want, to take 5 to the 31 power it’s difficult because after you enter the 3, the cursor drops down to normal mode. You’ll need to bracket the power with parentheses.

• For newer OS’s, the cursor stays in the exponent place until you press enter or the ► key.

• To upgrade the OS on your calculator you’ll need to download two files from TI. The first file is the new OS. The second file is a program that writes the new OS to your calculator. You’ll also need a cable to connect your calculator to your PC.

• For more info, google “TI os upgrade” or check YouTube

• Here are some links to check:

https://education.ti.com/en/software/search/ti-84-plus-family-ti-83-plus-family

https://mathbits.com/MathBits/TISection/Tidbits/UpGrade.htm