can you run any software on a computer with 0 bytes of RAM, I.e. only using the CPU cache?

like maybe with some kinda dummy RAM that was actually ROM to bootstrap it

@jk absolutely, you can run a computer from slow as molasses hard drive only, it's just that current computers expect to have RAM for obvious reason, but there's nothing saying they can't run without it besides the firmware on the BIOS EEPROM
@Efi @jk yeah the emulation im doing the ram is both storage and run time memory which could be replaced by flash-non-volatile memory