Well you can obtain the utilities using gray-area methods, they are out there. The copy of micronet utility comes with micronet SCSI drives. I had it on floppy, but its also downloadable on a certain gray-area site.
My first version of HDT is 1.2.1 from 1991 on 800k Floppies with the System 7 Savvy sticker on the box. If 1.6 won't cut it, maybe we can figure out a way for me to format an SD card for one of you to try with System 6.I pulled out the external HD and confirmed that it is running FWB Hard Disk Toolkit 1.3.1 Personal Edition from 1993. The application and driver works and boots fine on a B&W 68000 machine. The ReadMe that I found for 1.6 indicates it runs on System 6, so it might be compatible as well
Loosely related info in another thread: Striped RAID 0 in System 7.1.1 Pro?Macintosh Plus or later, 1MB of RAM, SCSI Drive and System 6.0.2 or higher.


That sounds like a TTL serial port, probably for debug or firmware updates.there is a JP3 on one side that lists 5V, TXD, RXD, and GND.