Windless Posted December 26, 2019 Share Posted December 26, 2019 (edited) Hi, according to 8bitworkshop and stella, the VBLANK bit if set to 1/0 affects the cathod ray 1 TIA Cycle avec it's commited on the bus by the CPU. Is this documented somewhere ? I couldn't find reference to this in the documentations I have. Thanks, Windless. Test code : ldx #64 ScanLoop sta WSYNC SLEEP 20 lda #$aa sta COLUBK lda #$34 sta COLUBK lda #$aa sta COLUBK sta WSYNC SLEEP 20 lda #$aa sta COLUBK lda #%00000010 sta VBLANK lda #%00000000 sta VBLANK sta WSYNC dex bne ScanLoop Result : https://8bitworkshop.com/v3.5.0/embed.html?p=vcs&r=TFpHAAAQAAAAAJFODB%2FcAQMEBQZ42KIAiqjKmkjQ%2B6kChQEGYQCFAgYiqQCFAKIlhQLKBREAhQGiQIUC6gYHqaqFCak0BmEG4QQPEAV%2FBSoFc8sFRaIeBb5MC%2FD%2FBh8GHwYfBh8GHwYfBh8GHwYfBh8GHwYfBh8GHwYfBh8GHwYfBh8GHwYfBh8GHwYfBh8GHwYfBh8GHwYfBh8GDADwAPA%3D Edited December 26, 2019 by Windless Quote Link to comment Share on other sites More sharing options...
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