TI-84 Plus series

The TI-84 Plus Silver Edition was released in 2004 as an upgrade to the TI-83 Plus. Like the TI-83 Plus Silver Edition, it features a 15 MHz Zilog Z80 processor and 24 kB user available RAM. The chip has 128 kB, but TI has not made an OS that uses all of it. Newer calculators have a RAM chip that is only 48 kB. All calculators with the letter H or later as the last letter in the serial code have fewer ram pages, causing some programs to not run correctly.[2] There is 1.5 MB of user-accessible Flash ROM. Like the standard TI-84 Plus, the Silver Edition includes a built-in USB port, a built-in clock, and assembly support. It uses 4 AAA batteries and a backup button cell battery. The TI-84 Plus Silver Edition comes preloaded with a variety of applications. These programs are also available for the TI-84 Plus, but some must be downloaded separately from TI's website. It is manufactured by Kinpo Electronics.

TI offers a special yellow version of the TI-84 Plus, inscribed with the words "School Property", for schools to loan out to students. This special design was produced in effort to combat theft.[3] Owners can buy other interchangeable colored face-plates and slide-cases online. A kickstand-style slide case and other accessories are also available. Although graphing calculators have been called inexpensive in education reform research,[4] the TI-84 Plus Silver Edition cost $139.00 as of 2013 on the TI online store. This calculator has been discontinued in favor of the TI-84 Plus C Silver Edition.

In 2011, TI launched the TI-84 Pocket.fr, a miniaturized version of the TI-84 Plus for the French market[5]. In 2012, TI launched the TI-84 Plus Pocket SE, a miniaturized version of the TI-84 Plus Silver Edition for the Asian market[6].

The TI-84 Plus C Silver Edition was released in 2013. It has a high-resolution 320x240-pixel color screen driven by the Ilitek ILI9335 LCD controller, a modified version of the 2.55MP operating system, a removable 1200mAh rechargeable lithium-ion battery and keystroke compatibility with existing math and programming tools[7]. It has the standard 2.5mm I/O (DBUS) port and a mini-USB port for connectivity and charging. This calculator was not received well by everyone as it is fairly slow (to the point of missing key presses and making the program editor unusable) compared to the older monochrome ones. This was mainly due to the fact that TI used the same TA3 ASIC as in late model TI-84 Plus/SE calculators, meaning it still used a 6/15 MHz dual-mode Z80. On 30 October 2014, Cemetech user Val managed to overclock their TI-84 Plus C Silver Edition by replacing resistor R07D with a 5 kiloohm potentiometer. Soon after, Botboy3000 showed off his version with a color coded speed control knob. These experiments proved the calculator was perfectly stable up to a blazing 22Mhz. It is still unclear why TI limited it, but one possibility is that they wanted to sell more calculators later (namely the more powerful successor, the TI-84 Plus CE). The TI-84 Plus C Silver Edition is still the last calculator to have a version of the Christopher "Kerm Martian" Mitchell's famous Doors CS GUI that, which despite the calculator's overall sluggishness, makes it an attractive purchase especially on the used calculator market. Due to being able to run 3rd party operating systems (such as KnightOS) and community-produced apps (both things which the CE cannot do), this calculator is the last super-hackable calculator from TI.

The TI-84 Plus CE was publicly previewed by TI Education in January 2015,[8] and released Spring 2015. The calculator retains the 320x240-pixel color screen, rechargeable battery, and key layout of the TI-84 Plus C Silver Edition, while removing the 2.5mm I/O ("DBUS") linkport and moving the USB port and charging LED to the right side of the handheld. The calculator's OS 5.x is incompatible with the TI-84 Plus C Silver Edition's hardware. The calculator has 154KB of user-accessible RAM and 3.0MB of Archive memory. It uses the eZ80 processor from Zilog, making all Z80 assembly programs from previous 84 Plus series calculators incompatible. The CE comes in multiple colors, Classic (black), Silver Linings, Radical Red, True Blue, Denim (navy blue), Lightning (light blue), Plum Pi (purple), Positively Pink (as of March 2015), Golden Ratio, and Bright White (as of June, 2016). Like the rest of the 84 Plus series, it is allowed on most standardized tests.[9] The calculator comes programmed with seven different languages (English, French, German, Dutch, Portuguese, Spanish, and Swedish). In 2016, the TI-84 Plus CE-T was released for the European educational market. The only significant difference from the CE model is the addition of an LED that blinks while the calculator is in Press-to-Test mode. CE calculators revision M and later (manufactured on and after April 2019) contain a faster flash chip (Winbond 25Q32JVSIQ) than previous revisions, which contained a Winbond W29GL032C. Due to this change, more recent revisions have seen a significant improvement in overall speed. Recently, Texas Instruments has decided to remove support for assembly and c programming on these calculators in response to a video posted on YouTube detailing how to bypass the test mode on OS version 5.2.2. The changes are reflected in OS version 5.5.1 and an attempt to run an assembly program gives the invalid error. The new operating system and restrictions apply to the international models, with changes expected in the US models by fall 2020.