INPUT & OUTPUT DATA IN Connector Square shape optical Format IEC consumer optical standard IEC 60958(S/P DIF) ALESIS Proprietary Multi Channel Optical Digital Interface DATA OUT Connector Square shape optical Format IEC consumer optical standard IEC 60958(S/P DIF) ALESIS Proprietary Multi Channel Optical Digital Interface MIDI IN Connector DIN 5-pin Format Comply to MIDI standard MIDI OUT Connector DIN 5-pin Format Comply to MIDI standard PUNCH IN / OUT Connector f6 mm phone jack (CMOS level) WORD OUT Connector BNC (TTL level) SCSI Connector D-SUB 25-pin Protocol SCSI-2, unbalanced transfer method Transfer type Asynchronous Number of device to be connected 2 SCSI ID: 0 ~ 5 Recording / reproducing SCSI ID: 6 Data backup