A fellow Data General minicomputer collector offered me his Nova 3/12 a while back and today me and  friend went to his place to pick up the Nova 3. Bjarni, as the friendly guy he is, also offered me to take his Model 4234, Diablo drive which I did. I now have a DG 19” rack, the Nova 3/12 CPU with:

• NOVA 3 CPU, PWRFAIL, PRLOAD, 256KW
• NOVA 3 TRIPPLE OPT, MMPU, PAR, MUL/DIV, RTC
• 64KW Plessey, 128K SC, W PAR, 0-127
• DGC NOVA CASSETTE I/O, $TTI/O, 9600 B, RTC
• DISK CARTRIDGE CONTROL DGC NOVA, DKP, 4234, 6030
• DGC NOVA CASSETTE I/O, $TTI/O, 9600 B, RTC
• A 4234 Diablo disk drive and a 6026 Vacuum Tape Transport

I believe the Diablo disk drive was part of the Nova 3/12 system since it has a disk controller installed for the Diablo drive.