Re: one or two lines scrolling

From: Anders Carlsson <*anders.carlsson_at_sfks.se*> Date: Fri, 18 Oct 2019 09:56:06 +0200 Message-ID: <efeb2f82-aca2-528d-ccad-550a562b1873_at_sfks.se> · anders.carlsson_at_sfks.se

silverdr_at_wfmh.org.pl wrote:
> When printing to 64 screen, I remember that the content gets scrolled sometimes one and sometimes two lines at once. Does it have something to do with "logical" vs. "physical" screen lines? And how to detect how many lines the content will be scrolled before it happens?

There is a line link table at $00D9 - $00F2. Whenever you have printed 
(not POKE) a character in the rightmost column, it will link two 
physical lines into one logical one and scrolling will occur based on 
that. It appears this happens by clearing the MSB on the link that 
exceeds the rightmost column. You could try to ORA all those addresses 
by $80 and see if you get consistent scrolling of one line at a time.

Best regards

Anders Carlsson