Not sure if this can help with implementing printer support for Famiclone keyboards, but just in case here's some info I've found:

http://133fsb.wordpress.com/2010/03/21/famicom-compatible-printer-port-interface/#more-94

Here's some variations of the "Educational TV Game", although not all may include printer support:
https://www.flickr.com/photos/playpower/3965536631/lightbox/
http://shopping.rediff.com/product/computer-educational-tv-game-keyboard---mouse/11087413
http://cheapestinindia.com/price/educational-tv-game-497534


Something's telling me that "Victor" company is not really JVC, by the way. =P