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Forums > C64 Coding > Horizontal d020 scroller
2015-02-04 21:15
xIII

Registered: Nov 2008
Posts: 210
Horizontal d020 scroller

I'm still learning ... and again I could use some advice.
I coded a d020 scroller that actually works :p

I'm having trouble with the stability (the scroller is jittering ?). I used the double IRQ routine but I just cannot get the timing correct.

If there's a coder out there who wants to help me by taking a look at the code, send me a msg with your email and I'll send you the kickasm code.

thanks.
 
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2015-02-12 10:05
Krill

Registered: Apr 2002
Posts: 2980
Quoting Bitbreaker
take care of having a cia detection if you do things by timer though.
This is why i prefer VIC rasterline interrupt + jitter correction via reading a CIA timer (which does not require handling different CIA revisions), rather than having CIA timer interrupts. Unless the former is not feasible for some reason.
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