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Monte Carlos
Registered: Jun 2004
Posts: 358 |
Left/Right Border switching in middle of rasterline
The last days i experimented a little with bit 3 of $d016. I had the brainfart to broaden the border on the left and keep it normal on the right. Disappointingly, this seems to work only in every non badline. If i try to switch bit 3 of $d016 during a badline i either get both left and right borders equal or i turn off the border completely for the next rasterline. Does somebody have an explanation in terms of internal VIC timing? I also tried modifying the timing with sprites or HSP to be able to write to $d016 in the correct cycle. |
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Compyx
Registered: Jan 2005
Posts: 631 |
isn't that like a normal scroll with sprites to solve the colum -1 thing? Ie. not really splitting anything? |
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Rastah Bar
Account closed
Registered: Oct 2012
Posts: 336 |
I noticed that if you change from hires to character screen during a line, that the graphics change 16 pixels / 2 chars later than the colors (for 8565 at least, for 6569 the colors change 2 pixels earlier). In other words, you can see 2 hires characters with the colors of a normal text screen (and vice versa when you change back). I guess if you switch 1 character into the left border, and fill the leftmost column of the hires screen, you can also fake a wider left border. The badlines are again a problem, though, and soft scrolling would be difficult. When the lower 3 bits of $d016 are changed, the position where color changes doesn't move, only the graphics shift. |
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