The 3b2 didn't have a built-in screen. You'd typically use a serial terminal with them, of which there were a near infinite many to choose from in the era.
One combination that was popular would be to pair up a DMD-5620 bitblit serial terminal with the 3B2.
There's already an emulator for the DMD-5620, written by the same guy that has written an emulator for the WE2000/3b2 setup.