"Chiptunes" means that some microprocessor was used as a sound synthesizer. In the initial years, you coded the tune. Then a standardization happened, as music code could be generalized in "sound patterns" definition and organization: hence, e.g., Chris Huelsbeck's Soundmonitor (1986). That is one of the first public "trackers". The name comes from the Ultimate Soundtracker on the Amiga (1987) - but the Paula was more typically used as a sampler, not as a synth. Speaking of "chiptunes" implies a style - that may or may not be the output of a tracker (it depends on how it is used).