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Conrad
Registered: Nov 2006
Posts: 839 |
Working with bad lines
hi.
Could someone help me with how to detect the bad lines properly and how to avoid them for raster based routines such as side borders. Would adjusting $d011 at each bad line be the best way? |
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Style
Registered: Jun 2004
Posts: 498 |
Badlines occur anywhere between raster line $30 and $f9 (from memory) where SCROLY (ie the lower 3 bits of $d011) match the lower 3 bits of $d012.
Yes, you can avoid them by never allowing SCROLY to equal the lower 3 bits of $d012. However, this will FLD the screen downwards so you wont be able to have anything on screen except sprites.
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Oswald
Registered: Apr 2002
Posts: 5034 |
I think there's no such easy solution u want to get. |
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Ninja
Registered: Jan 2002
Posts: 408 |
Maybe this thread can help you, too?
Screen with no Badlines |
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Radiant
Registered: Sep 2004
Posts: 639 |
You can still open the side borders on a badline, however you can't have more than 6 sprites on that line. No need to remove the badlines just to open the sideborder, unless you need those last two sprites. |
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HCL
Registered: Feb 2003
Posts: 719 |
@radiantx: Hmm, here at my place 4 sprites is maximum if you want open sideborder on a normal badline.. Also you can not use *any* 4 sprites, but only the 4 lowest priority (d015 = $f0). |
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Radiant
Registered: Sep 2004
Posts: 639 |
HCL: Really? I had a chat with Clarence about this some half a year ago, and IIRC he claimed six was the maximum, but I may be mixing things up. (Upd.: Most probably, as a more in-depth look at the timing charts reveal 4 is the maximum, and Clarence would know about these things.) |
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Oswald
Registered: Apr 2002
Posts: 5034 |
is it so hard to admit your mistake, was it nessesary to point a finger at Clarence ? |
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Conrad
Registered: Nov 2006
Posts: 839 |
HCL is right, you have to have the last 4 ($f0) sprites switched on for sideborder WITHOUT FLD (so you can make those nice sideborder DYCPs/pics/plasmas etc) and for side border with FLD (the 1001 crew way :) you have to have all 8 sprites switched on for it to work. I've never seen a demo with sideborder using SIX sprites before. |
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Radiant
Registered: Sep 2004
Posts: 639 |
Oswald: "I may be mixing things up" + "Most probably" = point a finger at Clarence? |
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Scout
Registered: Dec 2002
Posts: 1568 |
Quote: Oswald: "I may be mixing things up" + "Most probably" = point a finger at Clarence?
It's just a baaaad case of
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http://8bitmayhem.untergrund.net |
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