The Z88 uses has two physical locations for storage.Internal
Internally
with the 'built-in' standard 128K ROM and 32K RAM chip. Expansion may be made by changing these.
Expansion cards are easier to change using the three slots. RAM, ROM, Flash and EPROM with chips and expansion cards.Connecting external devices like other computers and Disk Drives can be used.
Externally
using the Serial Port. Other computers, Disk Drives, and cassette tape may be used.