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Bankswitching playfields


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Hey guys/girls

 

I try to use randomterrain for reference but the site seems to be down? Or my connection is blocked somehow? no ideaaa.

So I will ask here

First, I am using batarti Basic. I'm not looking for coding examples, I dont think.

My question is,

are certain banks dedicated to certain things? I feel like I may have read that somewhere, but I may be totally wrong, haven't spent much time with bankswitching yet. (until now)
That said, my problem is this. I wrote some code and made a bunch of playfields and sprites. Now bank 1 is used up and some of bank 8 too it seems. I know 32k may be to much for my first project, should be using smaller, but i'm just playing around i'd imagine my question would apply to any amount of banks?

 

I managed to put my sprites in bank 2 no problem, but when I tried the same for playfields, it was a no go. Rolling screens.lolll

Maybe im just coding it wrong, or maybe playfield can only go in bank 1? I have no idea yet and cant find where I think i read something about it lol.

 

So, yeah thats my questions focus, are banks dedicated? no is a cool answer. But if yes and you got a link or info please share : )

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  • 3 months later...

Ok, an ASSEMBLY question: :) What tools, code and what-not is needed to add a background image?

 

I want to add graphical enhancements to Joust in the background.

 

Also, need a good recommendation for an assembler. Would Distella work as a assembler/disassembler?

 

Thanks!

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What tools, code and what-not is needed to add a background image?

 

Unfortunately, for hacking an existing game, there's not an easy answer. The playfield is generally updated as part of the display kernel, but the details of how it goes from storage on cartridge rom, processed during the game logic, and then drawn to the screen during the kernel, can completely vary from game to game. You'd have to reverse engineer joust to figure out how they do it. (on top of that, some games use hardware collisions with the playfield to do game collision detection, some don't, so you'd have to figure that out as well.)

 

That all being said, I have a simple playfield editor tool that I built to translate playfield graphics into data that can be used in a game. You can draw, and it will generate playfield data (upside-down, which is usually easier to handle). But to use that data, you'd have to really understand assembly and how the atari works.

 

 

Also, need a good recommendation for an assembler. Would Distella work as a assembler/disassembler?

 

People here tend to use dasm. There are some other good assemblers for 6502 out there (ca65 for example), but I'd recommend using dasm for atari development, as you'd be able to get more help from people if you use it.

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  • 2 weeks later...

:D True. I actually decided against a background to Joust for a different reason. Why the background could enhance the platform look, the player character would not be able to interact with the enhanced look.

 

That said, thanks to this thread I learned of background tools if I need for another project in the future.

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What I meant was that there is a reason the platforms are flat symmetrical with no detail...the program is (potentially) repositioning objects while displaying them. No cycle time to waste altering their appearance, just set it and forget it, and turn them off after HMOVE. Color shading the background might be barely possible with the existing kernel, tho.

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