The PSD-120 adapter is specifically designed with a distinctive voltage—5.7V with a negative center pin, 2000mA—and connector essential for powering the following Roland products:

Roland System-1 Plug-Out Synthesizer
Roland System-1m Plug-Out Synthesizer
Roland TR-8 Rhythm Performer
Roland TR-8S Rhythm Performer
Roland TB-3 Touch Bassline
Roland VT-3 Voice Transformer
Roland AIRA MX-1 Mix Performer
Roland JD-Xi