[Oberon] SystemV - Viewer Scroll

Tomas Kral thomas.kral at email.cz
Thu Mar 14 20:28:07 CET 2019


Observing text viewer scroll by `MM'. 

When scrolling down, a portion of
text is copied up `CopyBlock', vacant part is cleared at the bottom,
a new text is copied into `CopyPattern'.

When scrolling up, the whole viewer is cleared and redrawn by

I wish [2] behave similar to [1], possible? 
Looking for a hint as to where in the source text this could be
experimented with?

Many thanks.

Tomas Kral <thomas.kral at email.cz>

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