Posted By
Csabo
on 2024-11-01
08:54:11
|  Re: Updating visible characters
It's difficult to diagnose what could be wrong with your code without seeing it, but from what you're describing, you're doing it correctly. The rule of thumb is: "don't update the part of the screen that is currently being drawn" - which is what leads to flicker.
If you're waiting for $FF1D = $CB, that's good. Common practice is to do a DEC$FF19 at the beginning of the code that updates the screen and an INC$FF19 at the end of it, so you can "see" how much CPU time is taken up. If that highlighted area doesn't wrap around and reach the top part of the screen (and from your video it looks like it doesn't), then you're good. My guess is that you're not updating the background character correctly. |
