This seems a fairly old version but is the latest one on the mirrors for downloading a CD image? Are there any more recent ones (no Adriane nonsense...
Texas Instrument TI99-4A Computer for Parts For Sale
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Texas Instrument TI99-4A Computer for Parts: $20
Texas Instrument TI99-4A for parts, this is the only piece i received. It is sold as is for parts, some of the keys are missing but all of the buttons seem fine. Any question just ask. All reasonable offers considered, Sold as Is.