Is it possible to upgrade Classic Amiga using
this board and Amithlon or Linux UAE?
No.... but I guess you mean to replace it and not to upgrade it and sure why not but trying to compare it with AmigaOne or Pegasos would be wrong since you would be stuck with OS 3.9. Amithlon and UAE gives you a way to run your old Amiga 68k stuff on new hardware but its no road to the future.
