D.G. Nova update (boo f'ing hoo)

[Tony Duell]

> 
> The DG drives have the same system, a N.O. relay with a huge cap
> yanks the linear motor home, should power fail. ANd there's the

DEC used a little NiCd battery pack, an NC relay contact (in other words, 
closed when the relay was de-energised, it was normally energised when 
the drive was in operation so that the contact was open then) and a 
microswitch that opened when the positioner was fully retracted. At least 
on the RK05...

The RK07 had something similar, at least there's a NiCd pack clipped 
under the chassis. 

Didn't some winchesters use the spindle motor as a generator to provide 
the emergency retraction current?

-tony