[Oberon] SystemV - Viewer Scroll

[Andreas Pirklbauer]

   > > Backward scrolling: 
   > Backward reading by single a char does not seem possible, or does it? 

Not as part of the standard Oberon file and text operations (see the earlier
post about standard Oberon read operations not being direction-symmetric)

One would have to simulate a “ReadBack" procedure by first setting a
reader to one position before the current position and *then* calling Read
to read forward from there.