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The Power Macintosh G3 computers have a SCSI bus for an additional internal SCSI devices, and one or more external SCSI devices. Additional internal SCSI devices receive power directly from the power supply.
The SCSI connector for the internal SCSI devices is a 50-pin connector with the standard SCSI pin assignments. It attaches to a cable that is connected to the main logic board by the internal chassis connector. The external SCSI connector is a 25-pin D-type connector with the same pin assignments as the external SCSI connectors on previous Macintosh models. The external connector supports a maximum data transfer rate of 5 MB per second. The internal and external SCSI connectors share the same SCSI bus.
The internal end of the SCSI bus is terminated by an active terminator. The terminator circuitry is located on the main logic board.