5 replies to this topic

[Trip2018]

Does anyone know how the color effect of chetiry was achieved and if there is a bB kernel avalible?

 

I am working on the japanese equivilent of it (hopefully that makes sence).

Edited by Trip2018, Fri Feb 2, 2018 7:25 AM.

[SpiceWare]

To figure out how things are done, load the game in Stella:

 

Then use the Developer Key COMMAND-<COMMA> on a Mac or ALT-<COMMA> on Linux/Windows to put Stella in Fixed Debug Colors Mode:

 

If you enter the debugger in Stella by hitting ` (left of 1, above TAB) and select the TIA tab you can see what those colors represent:

 

So Chetiry updates the object colors while the scanline goes across the screen (ie: Racing The Beam):

• BK = Background
• PF = Playfield
• P0 = Player 0
• P1 = Player 1
• BK = Background
• PF = Playfield
• P0 = Player 0
• P1 = Player 1
• BK = Background
• PF = Playfield (and a small sliver of BL, the ball)

The black on the left & right is where VBLANK is turned on in order to prevent the screen from being drawn beyond the left/right of the gameplay area.  

 

The setting of VBLANK on the right is 1 pixel late, which the ball is used to hide. This makes the last column of blocks 5 pixels wide instead of 4.  You can use the developer key COMMAND-B or ALT-B to turn the ball off and on in order to see why it's being used:

 

Ball ON:

 

Ball OFF:

[Trip2018]

I have no idea how or what I should do to implemment this as I have no experience with assembly language.

Edited by Trip2018, Fri Feb 2, 2018 1:59 PM.

[SpiceWare]

I have no idea how or what I should do to implemment this as I have no experience with assembly language.

 

 

It's not that difficult, try working through the interactive Easy 6502 tutorial.  If you can follow that, then check out my Collect tutorial.

[Trip2018]

Perfect, thanks.

Edited by Trip2018, Sat Feb 3, 2018 6:12 AM.

[Lewis2907]

SpiceWare,

 

Thanks for the link. I need to learn ASM. This should get me going.