The Z80 could even refresh the RAM by itself. It was not like the 8080 which required two support chips only to function.
[1] https://spritesmods.com/?art=tamasingularity&page=2
[2] https://archive.org/details/furby-source
[3] https://dmitry.gr/?r=05.Projects&proj=37.%20Pixter#_TOC_a6fe...