767 replies to this topic

[roland p]

Ben_Larson, on Tue Nov 25, 2008 5:53 PM, said:

roland p, on Tue Nov 25, 2008 4:28 PM, said:

But I'm really getting out of ROM space. Lots of code is generated with macro's. Is it OK to change some macro's into subroutines, push some variables to the stack and call the subroutines with JSR?

In general there's nothing wrong with changing macros into subroutines...except that it will eat CPU cycles due to the JSR/RTSes and the pushes and pops.

Here's a document that shows how to do f8 bankswitching:

http://www.qotile.net/minidig/docs/2600_ad..._prog_guide.txt

It's not too hard...partitioning the code is really the hardest part.

Ben

Thanks, I'll check it out. I'll go that route now, I can always optimise the code afterwards if I want to.

[Mirage]

Been following this since the start, and just want to express my appreciation (and amazement). Truly, this is incredible. Never would have guessed a 2600 could get even this far towards this goal. Please keep it up, and finish the game if possible (and it appears to be possible?) Incredible.

[roland p]

Mirage1972, on Tue Nov 25, 2008 6:14 PM, said:

Been following this since the start, and just want to express my appreciation (and amazement). Truly, this is incredible. Never would have guessed a 2600 could get even this far towards this goal. Please keep it up, and finish the game if possible (and it appears to be possible?) Incredible.

Thanks, I hope I can keep it up!

[ginnidog]

Once again, nice work. We hope to see it completed and on cart..

I`m new to this Forum, but I have been reading this topic ..

Paulie

[roland p]

Ben_Larson, on Tue Nov 25, 2008 5:53 PM, said:

roland p, on Tue Nov 25, 2008 4:28 PM, said:

But I'm really getting out of ROM space. Lots of code is generated with macro's. Is it OK to change some macro's into subroutines, push some variables to the stack and call the subroutines with JSR?

In general there's nothing wrong with changing macros into subroutines...except that it will eat CPU cycles due to the JSR/RTSes and the pushes and pops.

Here's a document that shows how to do f8 bankswitching:

http://www.qotile.net/minidig/docs/2600_ad..._prog_guide.txt

It's not too hard...partitioning the code is really the hardest part.

Ben

Hi,

I'm now trying to bankswitch. I've split my source into small parts so it's easy to move them around now.
The code in the document you're refering to is in the $1000-$1FFF range. My modified hello-world is in the $F000-$FFFF range (I don't know why). When I change my orgs from $FXXX to $1XXX and I compile the thing, things are really slowing down in the emulator. Any idea what is going wrong?

Attached Files

•  source.zip   13.94K   79 downloads

Edited by roland p, Wed Nov 26, 2008 3:29 PM.

[roland p]

problem solved

Edited by roland p, Thu Nov 27, 2008 3:35 AM.

[Thomas Jentzsch]

ACCELERATION is just a constant, so the address mode will be ignored.

[roland p]

Thomas Jentzsch, on Thu Nov 27, 2008 10:36 AM, said:

ACCELERATION is just a constant, so the address mode will be ignored.

Yep, just discovered it. thanks anyway!

[roland p]

Major update!

implemented for both players:

- non linear friction
- brakes
- bouncing on all 4 borders (was 3)
- max speed
- added bankswitching, 8Kb
- full internal 16bit calculations

now my brain hurts

There are some small visual glithces, I did not take care of that this time. The code is very bloated too, but at least the functionality is there.

Attached Files

•  ballblazer.bin   8K   118 downloads
•  source.zip   14.25K   88 downloads

Edited by roland p, Fri Dec 5, 2008 4:07 PM.

[ginnidog]

Looks awesome...

keep up the excellent work

PAulie

[Thomas Jentzsch]

Excellent!

Did you limit the maximum speed by hand or does it automatically get limited by the friction?

[Albert]

That really looks and feels great!

..Al

[iwan-iwanowitsch-goratschin]

Wow, awesome work so far!

[roland p]

Thomas Jentzsch, on Fri Dec 5, 2008 11:15 PM, said:

Excellent!

Did you limit the maximum speed by hand or does it automatically get limited by the friction?

Just by hand. For each axis there are 3 states: accelleration to max speed ór friction ór brake

[Random Terrain]

Now we don't go faster than the speed of light! Much better. Is it just me or is the maximum speed set a little too low? If I remember correctly, maximum speed is a little faster than that.

[roland p]

Random Terrain, on Fri Dec 5, 2008 11:20 PM, said:

Now we don't go faster than the speed of light! Much better. Is it just me or is the maximum speed set a little too low?

Could be, parameters can be easily tweaked now. I did not compare it to the real ballblazer yet.

[Godzilla]

Can anyone post some updated screenshots for those of us at work who can't run emulators? Thanks in advance if you can.

[Godzilla]

Ballblazer rules & keep up the awesome work! (oops dupe post I edited to make it say something.)

Edited by Godzilla, Fri Dec 5, 2008 4:31 PM.

[Thomas Jentzsch]

Godzilla, on Fri Dec 5, 2008 11:30 PM, said:

Can anyone post some updated screenshots for those of us at work who can't run emulators? Thanks in advance if you can.

It still looks the same, just the movement has been improved.

[Nathan Strum]

That's remarkable! I would never have thought Ballblazer could ever look so good on the 2600.

[Nathan Strum]

Godzilla, on Fri Dec 5, 2008 2:30 PM, said:

Can anyone post some updated screenshots for those of us at work who can't run emulators? Thanks in advance if you can.

You really have to see this in motion to get a sense of how good it looks.

[tschak909]

Roland, you have catapulted yourself into the pantheon of legend.

This is.... absolutely insane.

from one hacker to another...much respect.

Wow.

-Thom

[Albert]

Nathan Strum, on Fri Dec 5, 2008 8:34 PM, said:

Godzilla, on Fri Dec 5, 2008 2:30 PM, said:

Can anyone post some updated screenshots for those of us at work who can't run emulators? Thanks in advance if you can.

You really have to see this in motion to get a sense of how good it looks.

Someone should take a video.

..Al

[mos6507]

I'll add to the chorus. Excellent milestone.

[remowilliams]

Simply mindblowing to see that on the 2600! The movement and reaction feels very good.

As far as max speed, either the playfield is too large or the max speed is too slow. At least by my guestimation of 'feel' vs the A8.