Yes use a 512K bios Xecuter 4981 is a favourite of mine but any of the none 1.6 bios will work ok . Just burn the file to a disk name the bios file BIOS.BIN. Add a dummy file to the disk so the drive will read it easier.
make sure you have the Bank switch on the chip to bank 0 boot the machine and insert the flash disk at the prompt on the screen.