deuna driver problems in 4.[23]

[R.P.A.Collinson]

The deuna seems to be a UNIBUS hungry beast. Recently, Quantime in
London had this problem and I suggested that the interface was moved
further up the UNIBUS nearer the processor. There was a tape and disc
drive between it and the end of the bus.

This was a guess at the solution and based on no real knowledge. 

However, it did seem to solve the problem.

The tape and discs still work, by the way.