A hex dumper I wrote, because I wanted one like the one I've got on my UNIX machines.
It should be able to handle "proper" address 0 RAM banking, as well as r38 RAM banking (it checks the KERNAL version).
Set the color with the number keys.
Change the view by $100 with left/right cursor, by $300 with up/down, and by $1000 by enter/left arrow.
Now colorizes the 16 ABI pseudo-registers, and reverse prints byte zero, the KERNAL version byte, and MIST.