Hello all,
Longtime lurker here, but fairly new to NES development. I'm working on a game where I want the palette to dynamically change after the player scores a point (not a lot going on so I'm executing the code during V-blank, not anything fancy like H-blank). The code does what I want except it messes with the scroll and shifts the screen a seemingly arbitrary amount the first time the code runs. I thought scroll happened with writes to $2005 so I'm really confused why this behavior is present, so any insight would be appreciated. Thanks!
Longtime lurker here, but fairly new to NES development. I'm working on a game where I want the palette to dynamically change after the player scores a point (not a lot going on so I'm executing the code during V-blank, not anything fancy like H-blank). The code does what I want except it messes with the scroll and shifts the screen a seemingly arbitrary amount the first time the code runs. I thought scroll happened with writes to $2005 so I'm really confused why this behavior is present, so any insight would be appreciated. Thanks!
Code:
update_dynamic_palette: ;setup dynamic palette lda palette1 ;Check to loop back to blue and skip monochrome colors cmp #$0C bcc + lda #$01 sta palette1 + inc palette1 lda palette1 adc #$10 sta palette2 adc #$10 sta palette3 ;read PPU to reset latch lda $2002 ;set PPU address lda #$3F ldx #$00 sta $2006 stx $2006 ;load first palette from palette variables lda #$3F sta $2007 lda palette1 sta $2007 lda palette2 sta $2007 lda palette3 sta $2007 rtsStatistics: Posted by prototype6 — Sun Apr 07, 2024 10:51 am — Replies 1 — Views 98