Its main features are expandability and modularity. The AWIPS system architectural design is driven by expandability, flexibility, availability, and portability. Sometimes other considerations, such as features, size, weight, reliability, and expandability are also factors. All functionality and expandability is built upon the SCA. The NGI system will be a more modular system (allowing easy expandability). The PDP-8 combines low cost, simplicity, expandability, and careful engineering for value. They usually lack the ability to accept standard PCIe expansion cards, somewhat limiting their expandability. It lacks SRX card expandability, and turntable emulation, which the Roland MC-909 has. EPIC Express adds PCI Express expandability. The ROM, expandability, mainboard and case of the two machines were identical. It was the only Nexus device to have card storage expandability (SD). Dell's Home Office/Consumer class emphasizes value, performance, and expandability. Its speed and expandability should also made it popular in the scientific and technical markets. This expandability is similar to that available with the port on the Nintendo 64 controller. The magazine praised the sophisticated monitor software, user expandability, and comprehensive documentation.