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Texas Instruments release the TI99/4A in the USA

June 1981
Texas Instruments release the TI99/4A in the USA

The 4A is an upgraded version of the original TI99/4 released a couple of years earlier. The TI99/4 and the TI99/4A were the first 16bit home computers on the market. The TI99/4A uses a 16bit TMS9900 CPU (running at 3MHZ), and by using custom chipsets from Texas Instruments themselves, it allowed the machine to utilise hardware sprites and multi channel sound. Unfortunately, technological constraints prevented most operations being able to utilise the 16bit BUS, and most had to go via a 16bit to 8bit multiplexer, thus hampering the machine. However, the TI99/4A was able to support many hardware add-ons, and had an excellent full keyboard. The TI99/4A went on to be produced up until March 1984.






Texas Instruments release the TI99/4A in the USA

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