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Forums > C64 Coding > Weird ghostbyte glitch (8 sprites+borders open)
2024-07-04 21:11
Starfox

Registered: Jul 2014
Posts: 45
Weird ghostbyte glitch (8 sprites+borders open)

Hello

I'm fiddling with some border sprites and ghostbyte patterns/colors.

I'm alternating the bit pattern $aa (10101010) and $55 (01010101) on each rasterline, but at two points there's like a glitch where the same pixel is repeated twice.

Ohh and, I have 8 sprites displayed on each rasterline,and the borders are all open (the sprites are blank to show the problem).

Here's a screenshot:

https://www.dropbox.com/scl/fi/g6nt8giewsfp2rdw5g4tl/weird-ghos..

EDIT: It's not a VICE bug. I suspect its because of the timing of the writes or something sinister?

Cheers!
 
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2024-07-07 18:24
tlr

Registered: Sep 2003
Posts: 1814
Quoting Starfox
It seemed like it was frozen. I has testing using $d016,x not noticing I was using x in the loop as well, so everything from d016+ got set to $c0.

But in the debugger, none of the code in the irq was running. Only the jmp outside the irq.

Yeah, well writing $c0 to $d01a will kill further raster irqs.
2024-07-07 19:23
ws

Registered: Apr 2012
Posts: 251
ah. i see. thanks!
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