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TI-99/4A: History, Legacy & Companies

The TI-99/4 and TI-99/4A are home computers released by Texas Instruments (TI) in 1979 and 1981, respectively. Based on TI's own TMS9900 microprocessor originally used in minicomputers, the TI-99/4 was the first 16-bit home computer. The associated TMS9918 video display controller provides color graphics and sprite support which were only comparable with…

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TI-99/4A topic overview

The analysis highlights History, Legacy and Companies as prominent areas in the source structure around TI-99/4A.

Related topics
185
Source areas
9
Connected nodes
194
Extracted relationships
159
Concept neighborhoods
39
Bridge connections
194

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

History · 62 topics
Features · 30 topics
Expansion · 22 topics
Overview · 19 topics
Games · 15 topics
Architecture · 13 topics
Legacy · 9 topics
Unreleased hardware · 9 topics
Technical specifications · 6 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

CPU
TMS9900 @ 3 MHz
Developer
Texas Instruments
Discontinued
June 1981
Graphics
TMS9918
Introductory price
US$1,150 (equivalent to $5,100 in 2025)
Manufacturer
Texas Instruments

Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

Features

Expansion

History

Architecture

Technical specifications

Games

Unreleased hardware

Legacy

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

How TI-99/4A connects Entity context

The extracted context around TI-99/4A shows recurring relationship patterns in the source. For example, TI-99/4A → Ahl, Atari CX40, August, Because, BYTE, Citing Money, Commodore, Drop, Green's, He, Instant Software, It, Jack Tramiel, Kilobaud Microcomputing Wayne Green, Microsoft BASIC, Peripherals, Pournelle, Spectravideo, Spinnaker Software, Texas Instruments Another extracted example is TI-99/4A → Adventure Command Module, Alpiner, Arcturus, Car Wars, Century, Doom, Espial, Exceltec, Head On, KB, Killer Caterpillar, Miner, Munch Man, Pac-Man, Parsec, Roughly, Some, Space Invaders, Texas Instruments, The Adventure International. Use these groups to spot repeated connection types before inspecting the individual relationships.

TI-99/4A

Top relations

related to Lack of third-party development · 29
TI-99/4A → Ahl, Atari CX40, August, Because, BYTE, Citing Money, Commodore, Drop, Green's, He, Instant Software, It, Jack Tramiel, Kilobaud Microcomputing Wayne Green, Microsoft BASIC, Peripherals, Pournelle, Spectravideo, Spinnaker Software, Texas Instruments
related to Games · 27
TI-99/4A → Adventure Command Module, Alpiner, Arcturus, Car Wars, Century, Doom, Espial, Exceltec, Head On, KB, Killer Caterpillar, Miner, Munch Man, Pac-Man, Parsec, Roughly, Some, Space Invaders, Texas Instruments, The Adventure International
related to Features · 21
TI-99/4A → Although, An RF, ANSI-compliant BASIC, Atarisoft, Both TI-99/4, Dartmouth BASIC, Developed, KB, Later, Lowercase, MHz, RAM, ROM, Texas Instruments, TEXAS INSTRUMENTS V2, The, The TMS9900, TI, TI BASIC, TI-990
related to Post-TI development · 16
TI-99/4A → IBM PC/XT, It, MDOS, MHz TMS9995, Myarc, PEB, RAM, Released, SGCPU, System, The Myarc Geneve, The Second Generation CPU, TI, TI Peripheral Expansion System, TI-99/8, User Group
related to 99/4A · 15
TI-99/4A → An, Bill Cosby, By, Commodore, Commodore's, December, In May, Jerry Pournelle, The, There, This, TI, US, VIC-20, With
related to TI-99/4A successors · 15
TI-99/4A → At, Both, Hex-Bus, Initial, Later, Some, The TI-99/4, TI, TI-99, TI-99/2, TI-99/3, TI-99/4B, TI-99/5, TI-99/7, TI-99/8
related to Peripheral Expansion Box · 13
TI-99/4A → Each, Encased, LED, No, PEB, Peripheral Expansion Box, Peripheral Expansion System, Speech Synthesizer, Speech Synthesizer's, The, The PEB, The TI-99/4A, TI
related to External links · 8
TI-99/4A → Media, PageTI-99/4A, PEDIA, Texas Instruments TI-99/4A, TI-99, TI-99/4The TI-99/4A Home Computer, Wikimedia CommonsNinerpedia, Wiktionary-logo-en-v2
CPU · 1
TI-99/4A → TMS9900 @ 3 MHz
Developer · 1
TI-99/4A → Texas Instruments

Important terminology

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

ti 4a ti-99 99 computer system price software released 16-bit computers 1983 ti's memory expansion cpu company rom ram kb

TI-99/4A relationships Subject–Predicate–Object triples

TTTA extracted 159 structured relationships around TI-99/4A. Examples in this analysis include TI-99/4A → CPU → TMS9900 @ 3 MHz and TI-99/4A → Developer → Texas Instruments. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
TI-99/4ACPUTMS9900 @ 3 MHz1.00infobox
TI-99/4ADeveloperTexas Instruments1.00infobox
TI-99/4ADiscontinuedJune 19811.00infobox
TI-99/4AGraphicsTMS99181.00infobox
TI-99/4AIntroductory priceUS$1,150 (equivalent to $5,100 in 2025)1.00infobox
TI-99/4AManufacturerTexas Instruments1.00infobox
TI-99/4AReleasedOctober 1979 (1979-10)1.00infobox
TI-99/4ASuccessorTI-99/4A1.00infobox
TI-99/4ATypeHome computer1.00infobox
TI-99/4AUnits shipped≈20,0001.00infobox
TI-99/4Ais aself-contained console with the motherboard0.90text
Atarisoft.Both TI-99/4 models use the 16-bit TMS9900 CPU running at 3 MHzinstance ofprevent the use of unlicensed ROM cartridges from third-party manufacturers0.80text

Related concept clusters Concept neighborhoods

The concept neighborhoods around TI-99/4A bring nearby vocabulary together. In this analysis, examples include Ti-99, Ti and Texas. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • TI-99/4A
    • Ti-99
    • Ti
    • Texas
    • Released
    • Computers
    • Home
    • Keyboard
    • Computer
    • Tms9900
    • Cpu
    • Rom
    • Used
  • ti-99/4a
    • Ti-99
    • Ti
    • Price
    • Texas
    • Released
    • Computers
    • Home
    • Keyboard
    • Would
    • Expansion
    • Computer
    • Tms9900
  • home computers
    • Computer
    • Texas
    • Ti-99
    • One
    • Computers
    • Home
    • Price
    • Software
    • Tms9900
    • Ti
    • Two
    • Video
  • 16-bit
    • Tms9900
    • Cpu
    • Processor
    • Ram
    • Memory
    • Kb
    • Ti's
    • System
    • Rom
    • Available
    • Speech
    • Computer
  • video display controller
    • Processor
    • Graphics
    • Ram
    • Speech
    • Kb
    • Memory
    • Computer
    • Cartridges
    • Tms9900
    • Cpu
    • Home
    • Rom
  • rom cartridges
    • Cartridges
    • Rom
    • Texas
    • Memory
    • Kb
    • Processor
    • Available
    • Ram
    • Hardware
    • Speech
    • Tms9900
    • Software
  • ti basic
    • Computer
    • Available
    • System
    • Price
    • Graphics
    • Sprites
    • Also
    • Kb
    • Processor
    • Expansion
    • Ti-99
    • Memory
  • cpu
    • Tms9900
    • Memory
    • Ram
    • Speech
    • Rom
    • Processor
    • Video
    • Expansion
    • Ti-99
    • Ti's
    • Released
    • Graphics

Connections between topic areas Semantic bridges

For TI-99/4A, one of the stronger structural bridges in this analysis connects TI-99/4A with History. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
TI-99/4AHistory · splits 132 ⟂ 63
TI-99/4AFeatures · splits 164 ⟂ 31
TI-99/4AExpansion · splits 172 ⟂ 23
TI-99/4AOverview · splits 175 ⟂ 20
TI-99/4AGames · splits 179 ⟂ 16
TI-99/4AArchitecture · splits 181 ⟂ 14
TI-99/4AUnreleased hardware · splits 185 ⟂ 10
TI-99/4ALegacy · splits 185 ⟂ 10
TI-99/4ATechnical specifications · splits 188 ⟂ 7

Map overview Semantic statistics

TI-99/4A

Nodes195
Edges194
Triples159
Avg. degree1.99
Density0.010256
Components1

Source & methodology

TTTA analyzes the structure around TI-99/4A to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as History, Legacy & Companies, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — TI-99/4A · EN edition · Analysis: TopicsToTalkAbout

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