The read only A disk image for CPM is also provided as a 32 bit hex file. The disk image file "EZ80CPM.HEX" must be flashed into the external one megabyte flash memory on the SBC using the Zilog SPF flash program. Both file can be flashed to the EZ80 SBC at the same time. If you modify the source code only the "ez80-cpm.hex" file needs to be flashed to the EZ80 internal memory. The CPM disk image used for drive "A" was produced using the Z80Emu program.