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[–] effusive_ermine 0 points 1 point (+1|-0) ago 

Z80 Video Pack 80Turn your C64 into an 40 or 80 column black and white display. It had a Z-80 processor built into it so you could use CP/M! A company called “Data 20” produced these in the early days of the C64. This is an extremely rare find that would have been emensely helpful. As such we assume it did not work very well, was incompatible with most software or was very expensive. If you have any information on this device please contact us.

It might have been helpful if you wanted to run WordStar or other CP/M programs. I've never seen one of these, but I'm guessing it would have provided a monochrome 80 column text mode. Such things were nice for programmers, but if your program made use of the hardware then it would require that hardware to work. Given that these are truly rare, I'm guessing not enough were sold to make supporting software financially viable: chicken vs. egg.