Originally Posted by oldford

The only real difference between a "red" and a "green" file is location 0FCBFh.
For a red file the loation is 00 (zero), for a green one it's 033h.
In the eprom this is location 3CBFh.
All maps and parameters are in the same place for both types.
There's also some info here: http://bigturbo.co.uk/main3.htm