Robert, I'm a little confused. The original DG/One didn't have a hard
disk, nor an option for one--it did have an external bus connector that
(ostensibly) could be connected to an external expansion box that could
contain a hard disk, however. The model 1 DG/1 didn't even have a backlit
LCD--I think the model 2 used EL backlighting.
Do you perhaps have a later system--something like a Dasher 286?
Cheers,
Chuck