They are called ROMs because that is what the computer called them. The computer uses them to load initial startup code and base functions, and the ROM is in th

They are called ROMs because that is what the computer called them. The computer uses them to load initial startup code and base functions, and the ROM is in the "ROM" address space (as opposed to RAM, I/O, etc.). It does not matter whether it is EPROM or Mask ROM. It's basically the equivalent of BIOS.