Not Working, Black Screen

[Asylum Abscond]

Hello,

 

I am new to the forums and have read andrew davies tutorials. I am having problems though as when i run my game in Stella all i get is a black screen. I am attaching the source code in hopes some of you atari experts can figure out what i'm doing wrong. Any assistance would be greatly appreciated.

 

Sincerely,

 

Asylum Abscond

[+SpiceWare]

That's a lot of source code for an initial attempt, it might be best to start smaller.

 

Take a look at my latest blog entry, which shows how to generate a picture on the Atari. Then follow my blog over the next few weeks as I expand that into a functioning game.

[cwieland]

I reworked your Kernal a bit and adjusted the playfield color from black to a bluish color. Its defiantly not perfect, but it generates 262 scanlines most of the time. If the player's Y position is less than 36 the application produces duplicate scanlines where the player is drawn. I think this is may have to do with length of playfield data.

 

source.asm

[Asylum Abscond]

Thanks for restructuring my code. I took the liberty of starting over from scratch and redoing m code. I managed to get it to 263 scanlines which should be fine, but now the entire screen is black. I shouldn't be having any problems with running out of cycles as i've split the drawing into 2 different parts as well as lowering the playfield resolution. I can't see what the problem is. Any assistance would be greatly appreciated.

 

Sincerely,

 

Asylum Abscond

[Kylearan]

I've only taken a very quick look at your source, but if I see this correctly, lines 164/165 (dex; bne Draw_Screen) only loops over setting the playfield, never doing a check again if the player should be drawn (and the value of x is probably not what you want either). Try to replace it with "dey; bne CheckActivatePlayer" instead.

 

There are lots of other optimizations to be made, but that's for later.