The TMS9900 was actually used in several different systems, by different divisions within TI. I helped write one of them, before I was reassigned to DX10, the OS built on the TI 990 minicomputer. Then, after leaving TI, I worked for Ryan-McFarland (RMC), which implemented an executive (would hesitate to call it an OS) which ran on the TMS9900-based 990/2 model. The 990/2 was sitting more-or-less dead in distributors' warehouses (DX10 did not run on it), and the RMC product made the 990/2 sellable in competition with low-end NCR offerings. The 990/2 was totally separate from the more famous 99/4, which was the product developed by a different TI division. The TMS9900 was well ahead of its competitors (as the OP's ad quotation claims), but TI's focus was on different things. Being a diversified tech company has its drawbacks that highly focused companies can exploit.