At half the price of the original model, sales picked up significantly and TI supported the 4A with peripherals, including a speech synthesizer and a "Peripheral Expansion System" box to contain hardware add-ons. The TI-99/4A was released in June 1981 to address some of these issues, featuring a simplified internal design, full-travel keyboard, improved graphics, and a unique expansion system. The calculator-style keyboard of the TI-99/4 was cited as a weak point, and TI's reliance on ROM cartridges and their practice of limiting developer information to select third parties resulted in a lack of software for the system. Based on the Texas Instruments TMS9900 microprocessor originally used in minicomputers, the TI-99/4 was the first 16-bit home computer, and the associated video display controller provided color graphics and sprite support that was among the best of its era. The TI-99/4 and TI-99/4A are home computers released by Texas Instruments in 19, respectively. Home computer by Texas Instruments TI-99/4A
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