Date   : Sat, 30 Apr 2011 20:08:31 +0100
From   : info@... (Sprow)
Subject: *LOAD/*SAVE shadow screen

In article <20110430192404.j1lq3zq4v4go880k@...>,
   J.G.Harston <jgh@...> wrote:
> enclosing the save command in *FX108,1 and *FX108 will ensure
> that screen memory is saved. 
>
> Also, if you make calls to OSBYTE instead of using *FX then on
> systems without shadow memory the calls will be transparently
> ignored.

There's some disappointment on a RISC OS based machine, as the 
  A%=FNfx(108,0) 
gives the error "Command not recognised" for some bizarre reason - leading
to an error in the error handler leading to an error in the error handler
leading to an error in the error handler leading to an error in the error
handler leading to an error in the error handler leading to an error in the
error handler...
Sprow.