I currently have two TRS-80 Model 100s. One of them with an annoying screen defect and the other with a dead RS-232 port. These were both eBay acquisitions.
I also have a NEC that I've had since the early 80s. It seems to be working fine. One thing I found useful back in the 80s was to use my NEC to print labels on a dot matrix printer with a tractor feed. I've never come up with a useful way to print labels with an inkjet since you are usually committed to printing an entire page of labels. After making a couple more eBay acquisitions I obtained an Okidata Microline 320 and a cable to mate it to the NEC/TRS-80 Model 100. The NEC works just fine for this printer. I even got some tractor feed paper from Amazon and printed out some ASCII art images. Everything was cool. I wrote a calendar program (calling it YACalP.ba - for Yet Another Calendar Program). I will be putting this program on github after I document it a bit more. When I connect either TRS-80 Model 100, to the printer, it prints but does not do linefeeds. The carriage return function works but no line feed. I even tried doing a LPRINT CHR$(10) and no line feed. Anyone have any idea why the TRS-80 won't do the line feeds? Seems strange that they both are behaving the same way yet the NEC works fine. There is a lot of further investigation I can do, but I'm hoping someone might have an easy answer. Thanks Lloyd