Shoot, I just saw this!!
The TI PC was another 8088-based computer, but it wasn't IBM compatible, because TI wasn't trying to make a clone -- they were trying to make something better than the IBM PC. Its graphics capabilities were definitely better than IBM's: The TI PC had a max resolution of 720 x 300, vs. 640 x 200 for the IBM PC.
Here's a 1983 ad for the TI PC that showcases some of its graphics, which really do look pretty good:
As for its value, that's a little difficult to assess without more info, but this system is definitely a keeper. I did see one TI PC sold on eBay sometime last year. That one went for about $100 without the monitor.
BTW, I've wanted one of these for a while, so if you're looking to sell it, please let me know!
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