Hall, Austin & Flint, Homer Eon: The Blind Spot:. v1.1, 22 Feb 2008
 

From fantasticfiction.co.uk:

The Blind Spot is surely the great classic novel of parallel worlds. It is one of the most enthralling science-fiction books ever written. At once a fantasy adventure, an exceptional mystery, it is a new concept that touches the very framework of reality. What was 'The Blind Spot?' A room in San Francisco where strange things happened -- or a doorway into another cosmos, a different world, or perhaps the key to the past or future? The fantastic events that follow from its deceptively simple opening are the sort of stuff from which Charles Fort wove his world-shaking books and A. Merritt wrought fabulous novels. The Blind Spot is an experience in science-fiction imagination not to be missed by anyone.

The Blind Spot was followed in 1932 by The Spot of Life.

Please note that the filename ending in '_1200.imp' is for the REB 1200. The other one is for the EBW 1150.

hm, looks very interesting ! is this by any chance the inspiration for the science fiction mini-series The Lost Room ?