Texas Instruments graphing calculators

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This article is about contemporary fan-made clones. For the 2011 source port, see nDoom.

In the mid-1990s, Texas Instruments held a virtual monopoly on graphing calculators in the academic sector. Most models supported third-party applications using a native assembly language as well as the entry-level TI-BASIC, and finished programs could be imported from a PC via serial cable rather than transcribed manually. These factors combined to foster internet file-sharing communities wherein many well-known games received TI calculator clones, including Doom.

None of these were true ports, even after the source release, owing to hardware limitations (the popular TI-83 for example had a 6-MHz processor, with 24K ROM and 32K conventional RAM). The standard approach was to superimpose crude imitations of Doom sprites on a wireframe background representing walls and floors.

Doom86 (Ben Shelton)

Doom86, a TI-86 Basic game self-described as a "Doom-like game" was released in early March of 2000.

Doom83

A relatively polished assembler release for TI-83 and TI-83+, supporting multiple weapons, multiple levels, savestates, and OS multitasking. Later remastered as zDoom (no relation) to run on the TI-84+ as well.

Doom486

In 2005 a second TI-Basic version of Doom was released that included converted sprites from the original game, an assembly programmer noted "I came to the conclusion that FPS games in TI-Basic are unplayable. Well, guess what - I was just proven wrong" it was titled Doom486, and the engine was subsequently used to power a TI-85 port and a TI-86 port of Wolfenstein 3D.

Doom89

Somehow this program draws recognizable grayscale reproductions of techbase map walls, Doom's title screen, and an intermission screen. It also features keys and a primitive automap. It runs on the TI-89, TI-92+, and Voyage 200.

Doom Collection

This TI-82 game had nine levels, and actually supported mods via a separate program which could edit the bundled levels in place.

See also

• Doom (ZX Spectrum)
• vicdoom / ADoom (Atari)
• nDoom
• PocketStation DOOM

External links

• ticalc.org, still-active community site featuring programming credits and user reviews
  • ACME Software Doom II, CDOOM3, Doom (author unknown, TI-82 BASIC), Doom (author unknown, TI-83 BASIC), Doom (Ashu Chaturvedi), Doom (Josh Drubin), Doom (Cliff Liang), Doom00, Doom486 (backport to TI-85), Doom83, Doom85, Doom 86, Doom89 (source code), Doom92, Doom Collection (level editor, sample add-on), Doom: Epoch Chron, Doom: Virtual Reality, TI Doom, Ultimate Doom, zDoom
• Doom89 Released, thread at the Doomworld forums
• Calculator Doom, thread at the Doomworld forums

Sources

• "Choosing a Calculator Is No Simple Equation: Models do more than basic math", San Francisco Chronicle, 18 August 1998. Retrieved 15 July 2017.
• "Powerful Calculators Throw Teachers a New Curve", New York Times, 2 September 1999. Retrieved 15 July 2017.
• "Link Cables", ticalc.org. Retrieved 15 July 2017.
• This article incorporates text from the open-content Wikipedia online encyclopedia article Texas Instruments, accessed 20:47, 15 July 2017 (CDT).
• This article incorporates text from the open-content Wikipedia online encyclopedia article TI-83 series, accessed 20:47, 15 July 2017 (CDT).
• "LGR - 'Doom' on a Calculator! [Ti-83 Plus Games Tutorial]", YouTube video by Lazy Game Reviews. (Gameplay footage begins at 7:28.)