It's not ready for release yet, but I basically have the 82143A printer simulation in Nonpareil working now! You can see the result of PRA, PRP, and PRSTK in this screenshot.
There's not yet any way to save or copy the printer output, nor to change the printer mode (MAN/TRACE/NORM) or press the printer ADV or PRINT buttons. I also want to add a double-size view.
I'll make a new release available soon.
I'm missing one character in the font, code 123 (0x7b hex), because I couldn't make it out at all in the manual scan. I haven't the slightest idea what it's supposed to be. There are probably other errors in my transcription of the character set, so I'd like to get a better scan of either the actual printer output, or the page of the manual showing it.
Hmmm, maybe I need to add printer sound effects too! :-)