[Oberon] SystemV - Viewer Scroll

[Tomas Kral]

On Thu, 14 Mar 2019 20:28:07 +0100
Tomas Kral <thomas.kral at email.cz> wrote:

> Observing text viewer scroll by `MM'.

EDIT

[1]
Scroll down by a single line, text is moved up by CopyBlock(), a new
line appears at the bottom CopyPattern();

[2]
Scroll up by a single line, the whole viewer is cleared, then  redrawn
by CopyPattern().

How can we recode upscroll to...
text is moved down by CopyBlock(), a new
line appears at the top CopyPattern()?

--
Tomas Kral <thomas.kral at email.cz>