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| Released in 1981, the Texas Instruments TI-99/4A was an ambitious home computer from one of the world’s largest semiconductor companies. Building on the earlier TI-99/4, this updated model improved the keyboard, added lowercase character support, and included a more consumer-friendly price point. What made the TI-99/4A stand out was its 16-bit TMS9900 CPU, making it one of the earliest home computers to offer a 16-bit processor—at a time when 8-bit machines dominated the market. However, its architecture was unusual: the CPU accessed memory and peripherals through an 8-bit bus, which limited its effective performance. The TI-99/4A featured color graphics, sound capabilities via the SN76489 chip, and a range of expansion options through the Peripheral Expansion Box (PEB). Software was distributed primarily on cartridges, cassettes, and later floppy disks. It ran a version of TI BASIC that was easy to learn and well-suited to educational and hobbyist use. Despite competition from Commodore, Atari, and others, the TI-99/4A carved out a niche in the early 1980s thanks to its solid build quality, unique architecture, and wide availability in retail chains like Sears and JCPenney. It was discontinued in 1984 after a brutal price war in the home computer market |
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