assembly SPlitting the screen into 2 colors

[eliasarcade2005]

Hello, i am trying to split the screen with 2 colors (3/4 blue and 1/4 white), and I used the asm command in batari basic, what I am doing wrong? Pls help me. I keep getting 2 moving colors (ignore the color values).

 

 

main

asm

lda #$5C

LDX #96

START

sta WSYNC

dex

bne START

LDX #96

sta COLUBK

START1

STA WSYNC

dex

bne START1

LDA #$A9

STA COLUBK

 

end

 

goto main

[+Random Terrain]

Here's a link if you ever need a split screen side by side:

 

https://www.randomterrain.com/atari-2600-memories-batari-basic-commands.html#ctrlpf

[+Karl G]

Batari Basic code runs in a time slice known as overscan, after the visible screen has been drawn, so you can't update portions of the screen in real time like you are attempting. However, the kernel option "background" can do this:

 

https://www.randomterrain.com/atari-2600-memories-batari-basic-commands.html#kernop_background