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unemulated VSP graphical glitch ?
2023-05-09
21:18
Oswald
Registered: Apr 2002
Posts: 5017
unemulated VSP graphical glitch ?
Me doing VSP in the middle of the screen, need the VICII in idle state for this to work (or so I know) so I open a line that displays $3fff with "FLD", the VSP effect is achieved via a dec $d011, right after that in the following cycles FLI bug shows up, and after the FLI bug VICII returns to "normal" display.
however when using banks $4000 and $c000 also a 1 cycle wide black "bug" shows up too (before the fli bug I believe), but using banks $0000 or $8000 this doesnt happen.
vice 3.7 or hoxs doesnt emulate it.
possible explanation would be that VICII doesnt have the bus so reads $ff from non connected bus for ghost byte, but the used banks also control the behaviour.
edit: I have another VSP on the top of the screen done on the top border
2023-05-09
21:40
tlr
Registered: Sep 2003
Posts: 1714
Isn't this just the recently discussed anomaly here:
Testers needed: unemulated DMA Delay Artefacts
2023-05-10
08:32
Oswald
Registered: Apr 2002
Posts: 5017
oh yes, it looks to be the same, sorry I have red that thread, but forgot about it, didnt realize when reading what exactly the bug does.
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