I had been looking for pics for a long time now, just to find out there was a section of it in a Power Point viewer contained in the DC SDK r10. On the back of the Sega Dreamcast Development Box, there are SCSI 1 & SCSI 2 ports. The SCSI 1 links to the HKT-0400 - GD-Writer, while the SCSI 2 links to the Sound Box. The Sound Box could also be linked to the Apple Power Macintosh PowerPC 6500/225. The Sound Box uses a MIDI In/Out and Audio Out interface, and is mainly used for MIDI sound production.
Nice! Would you happen to know what type of connector is on the rear of the unit? I was never sure if it was SCSI 2 or SCSI Centronics.