I have four european (two CIB) and one USA main units, five
power units, four TV modulators, Speech synthesizer, four
double controllers, printer -adapter and tape drive -adapter.
type computer
country USA
year 1979
os TIBasic
cpu TI TMS 9900
speed 3.3 MHz
ram 256 KB
rom 26 KB
graphic 256 x 192
colors 16
sound 3 channels, 5 octaves
ports two controllers, cassette, RGB, cartridge
The Texas Instruments TI-99/4A — The 16-bit Home Computer
Released in June 1981, the Texas Instruments TI-99/4A was a distinctive and technically ambitious home computer — the world’s first 16-bit home computer, using TI’s own TMS9900 processor at 3 MHz. Where competitors used 8-bit processors like the Z80 and 6502, TI’s machine had genuine 16-bit processing capability, though this advantage was largely wasted by a design that required data to pass through an 8-bit memory bus. The TI-99/4A was sold at major retailers and found significant commercial success through aggressive price competition, ultimately selling approximately 2.8 million units before TI exited the home computer market in 1983.
The First 16-bit Home Computer
The TMS9900’s 16-bit architecture was years ahead of what competitors offered, but architectural compromises limited its practical advantage. The processor’s registers were stored in RAM rather than on-chip, and the memory bus was only 8 bits wide, meaning 16-bit operations required multiple memory accesses. These bottlenecks meant that despite its architectural sophistication, the TI-99/4A performed similarly to 8-bit competitors in real-world applications. The design reflected TI’s preference for using its own processor technology regardless of whether it was the best choice for the application.
The Speech Synthesiser
The TI-99/4A’s optional Speech Synthesiser peripheral was one of its most celebrated features — using the same LPC speech synthesis technology developed for the Speak & Spell to add spoken vocabulary to compatible software. Games that used the Speech Synthesiser provided a genuinely futuristic experience in the early 1980s, with the computer speaking to players in synthesised but recognisable speech. The Speech Synthesiser became one of the most popular TI-99/4A accessories, and games that supported it — including Parsec and Alpiner — used it to dramatic effect.