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Correctly powering your old Boss pedal (ACA vs PSA simplified)
Choosing the correct power supply for your Boss pedal can be a slightly confusing task. In general, Boss compact pedals were designed to use one of two adaptors: ACA or PSA. Although both ACA and PSA adaptors (and all Boss compact pedals) use the same sized jack/connectors as each other, their specifications and requirements are different.
If your pedal was built before 1997 then it's most likely made to use what was called the ACA adaptor. Don't confuse this with what's often called an AC adaptor (used on pedals like the...