Actually the TIPC and TIPPC is at least physically hardware compatible, meaning it uses 62 pin connectors on the motherboard. Not sure which cards will work though. Tecmar made a ram expansion board for it. There were a few other aftermarket cards, mostly IBM compatibility plug in cards, as rare as bear goiters. They were MS-DOS function call compatible and maybe BIOS interrupt compatible, the totality of which means nearly nothing when it comes to running IBM compatible software. Higher resolution modes (640 x 300 I think), faster iirc. Floppy drives aren't interchangeable. The video card uses a 6545, a close relative of the CGA/mda 6845. Missing DMA or something on the mobo side. The color monitor is very very rare it seems. I have a poorly kept TIPC and a color TIPPC. They're pretty seldom seen, but haven't commanded high prices (when last I've seen one). As said nice color graphic capability, but not terribly interesting otherwise. It is rare though. If you have an accompanying TI monitor, it's much more rare.
I have images of dos and most of lotus 123, and a bunch of manual pages scattered about. Haven't gotten around to sorting that all out. The guy who sold me the portable included a CD of junk, including a package called SNOBOL. Ain't that precious and sweet!