 The 130XE had 128 KB of memory, accessible through bank-selection, and the Enhanced Cartridge Interface (ECI), which was electronically almost compatible with the Parallel Bus Interface (PBI), but physically smaller, since it was located next to the standard 400/800-compatible Cartridge Interface and provided only those signals that did not exist in the latter; ECI peripherals were expected to plug into both the standard Cartridge Interface and the ECI port.Later revisions of the 65XE contained the ECI port as well.The 130XE was aimed to appeal at the mass market.