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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: 2854

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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