[Info-vax] vms 5.4 cmd cqd-220/T disk not seen

[blockhouse007]

Hi,
My objective it to get my microvax 2 bootable.
I have a bootable microvax 3800 with DSSI RF71 and RF73.
I have a cmd qbus disk controller with an RZ25 disk attached.
The onboard serial port utility sees the drive and tests it Ok  on both systems.
My problem is the Microvax 3800 does not see the drive as an RA/RD disk and therefore I can't install VMS on it. The 'show device' after self test shows UQSSP Disk Controller 0 (772150) ?
Added as the 3rd controller the system sees the DSSI RF drives ok but the CMD drive is seen as '?'
I have tried SYSGEN as well but should the pre-boot show device see the drive as an RA or RF?
If I  install it in the MV2 as the only disk controller, the TK70 boots STABACKIT but only sees MUA0, no drives.
The only odd thing is that the CQD22-M serial config utility shows a tape menu as well as disk. At some point it asked me if i wanted it to be disk only which I replied yes to. The menu then has disk test options and scsi bus scan options.
I have also tried a different scsi disk DSP3120 RH20-e with the same problem.
Am I missing something obvious, any support appreciated to stop my brain from exploding.
Many Thanks