TI-84 Plus series

The TI-84 Plus is a graphing calculator made by Texas Instruments which was released in early 2004. There is no original TI-84, only the TI-84 Plus and TI-84 Plus Silver Edition models. The TI-84 Plus is an enhanced version of the TI-83 Plus. The key-by-key correspondence is relatively the same, but the 84 features some improved hardware. The archive (ROM) is about 3 times as large, and CPU about 2.5 times as fast (over the TI-83 and TI-83 Plus). A USB port and built-in clock functionality were also added. The USB port on the TI-84 Plus series is USB On-The-Go compliant, similar to the next generation TI-Nspire calculator, which supports connecting to USB based data collection devices and probes, and supports device to device transfers over USB rather than over the serial link port.[1].

TI-84 Plus
TI-84 Plus
TypeGraphing calculator
ManufacturerTexas Instruments
Introduced2004
Latest firmware2.55MP
PredecessorTI-83 Plus
SuccessorTI-Nspire
Calculator
Entry modeAlgebraic Operating System
CPU
ProcessorZilog Z80
Frequency6/15 MHz
Programming
Programming language(s)TI-BASIC, Z80 Assembly
User memory128 KB or 48 KB RAM (depending on hardware revision) of which 24 KB are user accessible.
Firmware memory1 MB Flash ROM (480 KB user-accessible)
Other
Power supply4 AAA's,
1 SR44 button cell
TI-84 Plus SE
TI-84 Plus Silver Edition
TypeGraphing calculator
ManufacturerTexas Instruments
Introduced2004
Latest firmware2.55MP
PredecessorTI-83 Plus Silver Edition
SuccessorTI-Nspire
Calculator
Entry modeAlgebraic Operating System
CPU
ProcessorZilog Z80
Frequency6/15 MHz
Programming
Programming language(s)TI-BASIC, z80 Assembly
User memory128 KB or 48 KB RAM (depending on hardware revision) of which 24 KB are user accessible.
Firmware memory2 MB Flash ROM (1.5 MB user-accessible)
Other
Power supply4 AAA's,
1 SR44 button cell
TI-84 Plus C SE
TypeGraphing calculator
ManufacturerTexas Instruments
IntroducedSpring 2013
Latest firmware4.2
PredecessorTI-84 Plus Silver Edition
SuccessorTI-84 Plus CE
Calculator
Entry modeAlgebraic Operating System
CPU
ProcessorZilog Z80
Frequency6/15 MHz
Programming
Programming language(s)TI-BASIC, Z80 Assembly
User memory128 KB RAM of which 21 KB are user accessible.
Firmware memory4 MB Flash ROM (3.5 MB user-accessible)
Other
Power supplyRechargeable lithium-ion battery
TI-84 Plus CE
TypeGraphing calculator
ManufacturerTexas Instruments
IntroducedSpring 2015
Latest firmware5.4
PredecessorTI-84 Plus C Silver Edition
Calculator
Entry modeAlgebraic Operating System
CPU
ProcessorZilog eZ80
Frequency48 MHz max.
Programming
Programming language(s)TI-BASIC, eZ80 Assembly, C
User memory256 KB RAM of which 154 KB are user accessible.
Firmware memory4.0 MB Flash ROM (3.0 MB user-accessible)
Other
Power supplyRechargeable lithium-ion battery

In 2015, Texas Instruments released the TI-84 Plus T in the Netherlands. This model is very similar to the original TI-84 Plus, but features an LED to indicate whether or not the calculator is in Exam Mode. The hardware of the TI-84 Plus T is similar to the TI-84 Plus Silver Edition, with 96 16 kB pages of archive memory, for a total of 1540 kB. However, unlike the TI-84 Plus, the TI-84 Plus T does not allow users to execute assembly programs. The TI-84 Plus T has 2 different Exam Modes available with different levels of restrictiveness. The most restrictive level does not allow for any existing programs to be accessed, and does not allow any new programs to be created. This mode makes the LED blink green. The second, more moderate Exam Mode is the same, apart from three additional applications being allowed (PlySmlt2, Inequalz and Conics). This mode makes the LED blink orange.

Versions

TI-84 Plus Silver Edition

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 Texas Instruments 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 an 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 costs $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].

TI-84 Plus C Silver Edition

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 keypresses 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.

TI-84 Plus CE and TI-84 Plus CE-T

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 the previous TI 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. In 2020, TI Education announced its decision 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. TI's response was widely considered unnecessary, and led to anger from users. 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 U.S. models by fall 2020.

Software

There are three different types of programs which can be downloaded or programmed into the calculators: TI-BASIC, Z80 assembly language, and Flash applications (also written in Z80 assembly). The TI84+CE is different in that programs are written in TI-BASIC, eZ80 assembly language, or in the C programming language. In addition, there are programs available that are able to compile or interpret other programming languages. Also, there are several languages developed by community members for the calculators, notably ICE, which is for the TI84+CE, and Axe, which is for the TI84+ and TI84+SE. There are a wide range of applications that this produces, from science classes, to games, to calculus to note taking (when put together with a separately sold keyboard). The TI-84 Plus Series is exactly like its predecessor in that it can be used on the SAT and ACT examinations as well as International Baccalaureate examinations. However, in some cases those administering the exam may reset the calculator's memory beforehand to prevent cheating through the use of built in programs or other data.[10]

When OS 2.30 was initially released, users noticed the speed of graphing was greatly reduced. The explanation was that the update added asymptote checking in graphing.[11]

In January 2006, Texas Instruments released v2.40 of the operating system for the TI-84 Plus series. The most noticeable addition to the new OS was the "Press-To-Test" feature that allowed a teacher to disable any programs installed on the calculator, so they cannot be used on tests, etc.[12] As of OS version 2.53MP which was released in February 2010, support was added for prettyprinted expressions. However, some programs stopped working correctly in this OS version, or were running slower.[13] The current OS version is 2.55MP which was released in January 2011.[14]

In July 2009, a community-made patch was released which allowed user-made operating systems to be easily uploaded onto the TI-84 plus series. Shortly after the patch was developed, the RSA keys for the calculator's operating system were factored via the General number field sieve (GNFS) algorithm, making a software patch unnecessary. In response to this, Texas Instruments released a newer hardware revision which only accepts other, stronger RSA keys, making it harder to load user-made operating systems or older TI operating systems (2.53MP and earlier). The community has found a way around the newest limitation by discovering a way to revert to older versions of the boot code.[15]

Critics point out that the basic design of the TI-84 has not changed since it was released in 2004, contrary to the trend of rapid design change occurring in other areas of electronics manufacturing.[16][17]

Technical specifications
  • CPU: Zilog Z80 15 MHz, with 6 MHz compatibility mode.
  • Flash ROM
    • Plus Edition: 480 KB user accessible of 1 MB
    • Silver Edition: 1.5 MB user accessible of 2 MB
    • Third-party software permits usage of FAT16-formatted USB drives[18]
  • RAM: 24 KB RAM user accessible of 128 KB (48 KB on newer models)
  • Display
    • Text: -16-×|8| characters (normal font)
    • Graphics: 96 (0-95) ×64 (0-63) pixels, monochrome (software grayscale can be used) LCD
  • I/O
    • Link port, 9.6 kbit/s
    • 50 button built-in keypad
  • USB
  • Power
  • Integrated programming languages: TI-BASIC and machine code. Assembly requires a computer with a Z80 assembler or an on-calc assembler.

Programming
Main article: TI-83 series § Programming

The TI-84 Plus is based heavily on its predecessor, the TI-83 Plus. As with all other calculators in the series, the TI-84 Plus supports native Z80 assembly as well as TI's interpreted, BASIC-like language for calculators, dubbed TI-BASIC. Programming for the TI-84 Plus is nearly identical to programming for the TI-83 Plus, with a few new functions in both TI-BASIC and the calculator's assembly support that do not exist on earlier models and OS versions. Several attempts have been made at creating a C to Zilog Z80 assembly assemblers, such as SDCC.[19]

The TI84+CE series can be programmed in TI-BASIC, eZ80 assembly, or with the C programming language.

The TI-84 Plus calculators' dialect of TI-BASIC is the same as that of the TI-83 Plus series, but with a few more commands including ones for date and time.

gollark: I sort of know it, or at least can write reasonably working code in it even if I don't have an intuitive grasp of the weird underlying category theory stuff, but it's really annoying to do the sort of things my code usually involves in it. It's great for stuff like compilers and complex algorithms at least.
gollark: Haskell is very useful if you need to comonadize a zygohistomorphic prepromorphism.
gollark: Something about "explore-exploit tradeoffs".
gollark: I have a book called "Algorithms to Live By" which I think mentions something like that.
gollark: Yes (I can apparently claim it), though weirdly they don't seem to have any actual pictures of it.

See also

References
  1. USB Peripherals for the 84+ - ticalc.org
  2. Multiple authors (3 October 2009). "Topic: TI-84+ hardware change info (causing all APPs using extra RAM pages to crash)". p. 1, Third post. Retrieved 28 May 2010.
  3. School Bus Yellow for TI-84 Plus
  4. Graphing Calculator Intensive Calculus
  5. TI-84 Pocket.fr at the Wayback Machine (archived 3 April 2011)
  6. TI-84 Plus Pocket SE at the Wayback Machine (archived 26 April 2012)
  7. "Hands-On with the TI-84 Plus C Silver Edition: Full Review - Cemetech - News". Cemetech. Retrieved 21 February 2013.
  8. "TI-84 Plus CE Graphing Calculator by Texas Instruments". TI Education. Retrieved 13 January 2015.
  9. "Get Started with the TI-84 Plus CE". Cemetech. Retrieved 13 April 2016.
  10. "TI-84 Plus Silver Edition". Texas Instruments. Retrieved 1 April 2012.
  11. "OS 2.30 Distinguishes Asymptotes". Retrieved 1 April 2012.
  12. "Press-to-Test for TI-84 Plus & TI-84 Plus Silver Edition" (PDF). Texas Instruments. Retrieved 1 April 2012.
  13. TI-OS 2.53 Released for TI-84+ Family - ticalc.org
  14. Release Notes for TI-84 PLUS OS Version 2.55MP
  15. "Flashy, le programmateur de Boot Code TI-83+/84 est sorti!" (in French). Retrieved 7 February 2013.
  16. "Cracks in the TI-84 calculator monopoly?". youtube.com. CNN Business. 12 May 2017. Retrieved 2 July 2019.
  17. {{cite web |last1=McFarland |first1=Matt |title=The unstoppable TI-84 Plus: How an outdated calculator still holds a monopoly on classrooms |url=https://www.washingtonpost.com/news/innovations/wp/2014/09/02/the-unstoppable-ti-84-plus-how-an-outdated-calculator-still-holds-a-monopoly-on-classrooms/ |website=[[Washington Post]|language=English |date=2 September 2014}}
  18. "Welcome to the usb8x homepage!". Retrieved 7 September 2017.
  19. http://www.cemetech.net/forum/viewtopic.php?t=7087
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