A-6 Radar Display?

Just started re-reading Coont's Flight of the Intruder, and his
description of the capabilities of the terrain radar is interesting.

Early in the book he describes a training flight through canyons and
valleys in IMC, using the radar for avoidance.

I'm curious what the BN would actually see in his scope? Would it be a
like a line drawing of the terrain (quite visual and not needing much
interpretation) or would it be more like a staticy TV with 'blobs' that
needed skill to interpret what they represented? Or something else
completely, like an oscilloscope type of display?

Thanks in advance. Tried googling, but didn't really know what to
search for.

Nick