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|    comp.sys.cbm    |    Discussion about Commodore micros    |    53,866 messages    |
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|    Message 53,082 of 53,866    |
|    PaulM to All    |
|    C-128 Smooth Scrolling in 8563/80-column    |
|    01 Jun 20 13:26:14    |
      From: paul.s.macmillan@gmail.com              Hi,               I have been playing around in a VICE x128 app, trying my luck at the 8563       smooth scrolling features.              I know that writing values 1-7 to Register 24 causes the display to scroll the       intended number of scan lines, and I see that working (sort of). While the       content gracefully slides up and out of view at the top, what appears at the       bottom of the screen,        the new content to be scrolled in, appears as "gibberish."              I am using the $1000 area of 8563/video RAM as the character display RAM (set       via registers 12 and 13) and have written/copied 2 entire screens worth (4096       bytes) of blank screen characters (#102) to fill the RAM before I try       scrolling. But no matter        what the new data scrolling in at the bottom is garbled. I have advanced       Register 13 (low byte of screen data) by 80 bytes before and after the       attempted smooth scroll to no avail.              Any clues appreciated!              --- SoupGate-Win32 v1.05        * Origin: you cannot sedate... all the things you hate (1:229/2)    |
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