An effect which has maintained it relevance throughout the decades, phaser has been widely available in compact pedal since the 70's. The Boss PH-1 could be seen as a direct response to MXR's Phase 90, 45 & 100 which you can also find on TonePedia.
The PH-1 is a simple two-knob pedal with controls for Rate and Depth, it’s a 4-stage phaser with a 16-second to 100-millisecond range. Early phasers weren’t quite as adept at capturing the Leslie sound as players would have liked, but that didn’t really matter. Guitarists took the unique sound of the phaser pedal as its own entity, and started to exploit it for its own particular merits.