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Why did TI use the Z80?


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So I was watching the blood moon with a neighbor last night who worked for TI back in the 80s. And I posed a question to him that he couldn't answer.


"Why did TI use the Z80 instead of the TMS9900 for their TI-83 calculator?"


It seems as though they would have kept the cost down and given themselves the business, instead of someone else. Not to mention that the 9900 is appears to be a much more powerful processor than the z80. The only thing I can come up with is that they didn't want to have to write the necessary changes in code to make the TI-99's basic work on their calculator. And instead, used something that was much more popular on the market.


Does anyone have any insight to this?

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