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ZBasic System Library 14 ZX Microcontroller Family The remainder of this document presents complete descriptions of each of the System Library routines, arranged in alphabetical order. Unless specifically noted otherwise, the descriptions apply to all ZX models. In some cases, a routine exhibits different behavior in BasicX compatibility mode or operates in a manner that is slightly different from that implemented in the BasicX environment. In these cases, the heading Compatibility will appear in the description detailing the differences. The advanced System Library routines that are not present in the BasicX environment are also similarly noted. If you are not using BasicX compatibility mode or are not upgrading BasicX code these notations may be safely ignored.