I remember stories of famous authors using one-off word processor devices (imagine: old LCD that can only show about 5 lines of text, and the device can hold a

I remember stories of famous authors using one-off word processor devices (imagine: old LCD that can only show about 5 lines of text, and the device can hold a megabyte of crap in some sort of flash or something similar) from back in the day. Basically the minimal step up of computerization from the typewriter. What else does a writer really need?