Research any topic before you write.

Find related topics. | Discover entities. | See connections. | Build a topical map.

TI-99/4A

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…

History, Legacy & Companies

Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.

Research this topic

Explore the main themes, entities and connections around TI-99/4A. Start with the topic map, then use the sections below for research and deeper semantic analysis.

Explore this topic

Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.

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

Topics to explore

Browse the full topic structure. 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.

Map overview Semantic statistics

TI-99/4A

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

How this topic connects Entity context

See the strongest relationship patterns around the current topic before diving into the raw triples.

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 Word statistics

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

Entity relationships Subject–Predicate–Object triples

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

These clusters group vocabulary that occurs around closely connected concepts in the source material.

    Connections between topic areas Semantic bridges

    Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.

    Min side: 3
    For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.