8-bit_d-boy

WHOA!! That's awesome!!

Dendy - essentially an unauthorized Famicom clone standard that uses a DB9 connector for NES/FC controllers, same number of buttons as the Genesis.

Hey, guys, been a while. The GPU in my main computer died a couple weeks ago, so I've been using my laptop and just haven't signed in. I'll have to set up Batari Basic to get back to workin' on this.

I believe it's the PF0 register, takes a byte as argument, only the upper 4 bits of which do anything.

Just curious, really.

Excellent work! This runs very smooth in Stella. My only suggestion would be to make the Color/BW switch switch between rendering modes. Now to make Tunnel Runners 2!

So by playing around with the code for about a minute, I've regained some understanding of how the code works and the bug where the ball does not move in a straight horizontal line when hit from the side is caused by the clip check code I just fixed(duh): temp6 = bvx + bvy if bvx > bvy then temp5 = bvx / bvy : temp4 = bvy else temp5 = bvy / bvx : temp4 = bvx for temp3 = 0 to temp4 temp2 = temp3 / temp4 temp1 = temp3 - (temp2 * temp4) if temp1 = 0 then if bvx > bvy then bally = bally + 1 : if bvy > bvx then ballx = ballx + 1 if temp1 <> 0 then if bvx > bvy then ballx = ballx + 1 : if bvy > bvx then bally = bally + 1 if collision(player0, ball) || collision(player1, ball) then temp3 = temp4 next I'm gonna stare at it for a bit to try to figure out why it's not working properly.

Why did I not think of this? Though it would make it harder to get into another atari game.

YOU'RE ALIVE!! Oh crap, its so simple, how did I miss it? Also I think I forgot to mention, I added use of the difficulty switches: players will no longer be able to move fast with the fire button with the switch set to "Advanced". EDIT: So I compiled it and it works! That said, I have good news, and bad news. Bad news is I kinda forgot how some of my code worked(or at least was supposed to) and some bugs got introduced where the ball gets stuck in the bottom edge of the playfield and the ball doesn't move horizontally when you hit it from the side so I can't tell if that fixed the clipping issue. Good news is there's like 1 frame where the screen flickers when you hit the ball at full force which looks REALLY cool, I'll include the ROM so you can see for yourself! airhockey.bas airhockey.bas.bin

A hex editor in binary mode is gonna be your most likely bet, just keep in mind that sprites are laid out upside-down in memory for some reason. That said, there are also graphics editors for hacking, so check out the hacking page of AtariAge to find those.

Hmmm, now I'm getting this error: --- Unresolved Symbol List 284 bytes of ROM space left C:\Users\chris\atari\airHockey\air hockey\airhockey.bas.asm (3437): error: Branch out of range (158 bytes). Fatal assembly error: Source is not resolvable. Errors were encountered during assembly What does it mean by "branch out of range"? That reminds me, I hope RT is doing okay. Here's the code: airhockey.bas

Thanks! I'll have to try this.

Thanks, that's a good idea. If it's not too much to ask, could you find it?

Is it possible to do a modulus operation without the advanced math modules? I can't get them working in my code. Haven't touched it in a while. I'm trying to make it so that when the ball collides with the paddle, it stays outside of it to make determining the direction it reflects in easier.

HOW IS THIS LEGAL!?!?

It is doable, but I think the most columns the 2600 can do at once is 12 at 8px horizontal per character by multiplexing the scoreboard, 4 more if you use both sprites and multiplex them as well, which means characters will be interlaced and/or flickery, this cannot be done in Batari Basic, however, at least not yet. A good ROM to see this in action is Dark Mage which is a text adventure. Another option to fit more text in would be using the titlescreen minikernel(check out the robotron 2084 title demo), but that would require encoding the instructions as a bitmap and that would take up a lot of space. As for using separate ROMs, I think a better solution would be to hack it in so it's in a separate bank from the main game - perhaps accessible through the color/bw switch.

I forgot to mention, I was trying to get the remainder with the // operator. EDIT: Attached current code. airhockey.bas

More compilation issues (yayyy). So in order to move the ball up until it collides with the paddle and no more, I modified this: if scoring <> 61 then _skip_ball_movment pbx = ballx if bMoveLf then ballx = ballx - bvx if bMoveRt then ballx = ballx + bvx pby = bally if bMoveUp then bally = bally - bvy if bMoveDn then bally = bally + bvy _skip_ball_movment to this: temp6 = bvx + bvy if bvx > bvy then temp5 = bvx / bvy : temp4 = bvy else temp5 = bvy / bvx : temp4 = bvx if scoring <> 61 then _skip_ball_movment pbx = ballx for temp3 = 0 to temp4 temp2 = temp3 // temp4 if temp2 = 0 then if bvx > bvy then bally = bally + 1 : if bvy > bvx then ballx = ballx + 1 if temp2 <> 0 then if bvx > bvy then ballx = ballx + 1 : if bvy > bvx then bally = bally + 1 if collision(player0, ball) || collision(player1, ball) then temp3 = temp4 next if bMoveLf then ballx = ballx - bvx if bMoveRt then ballx = ballx + bvx pby = bally if bMoveUp then bally = bally - bvy if bMoveDn then bally = bally + bvy _skip_ball_movment and it won't compile now, stating: --- Unresolved Symbol List div8 0000 ???? (R ) 425 bytes of ROM space left C:\Users\chris\atari\airHockey\air hockey\airhockey.bas.asm (3435): error: Branch out of range (138 bytes). Fatal assembly error: Source is not resolvable. Errors were encountered during assembly. Progress, I guess.

It's cool dude, I was asking help from anyone who could and was not expecting you to feel obligated to helping me. Thanks for all your help so far and good luck with your pancreas. https://www.youtube.com/watch?v=tqDBB0no6dQ

Nice! Does it emulate the 7800's warmup hue-shift?

That's what I meant to say, thanks dude!

You're a little late to this thread, pal.

So I have 540 bytes left for my program to not only fix the clipping issue, but also implement collisions that move the ball in more directions than just the reverse of what it was doing, not to mention copy that over to player1. I REALLY wanna fix the clipping issue as it's kind of a game-breaker in some regards. I think I'd be able to implement the other things though. EDIT: I started working on some code to move the ball back to where it would hit the paddle between its last position and current position, and I'm trying to figure out how to move it so that it's only touching the paddle, and I think this could not only prevent the clipping issue, but also aid in determining what direction to ricochet in. I need to figure out what formula I can use to determine where to put the ball based on: Ball's direction Ball's current position Ball's previous position Ball's size(4 by 4) Player's position Player's size(8 by 8 ) Here's what I have so far, and no, it doesn't work right, but it's a start I guess.: ; BEGIN CONTEXT rem ----RED PADDLE COLLISION---- if !collision(player0,ball) then goto _skip_P0_B_col if bCollsn then goto _skip_P0_B_col AUDF1 = 4 - bvy AUDV1 = 15 bCollsn = 1 tmp = 0 if ballx > player0x - 3 && ballx < player0x + 7 then xClip = 1 if bally > player0y - 3 && bally < player0y + 7 then yClip = 1 if xClip && yClip then xy_Clip = 1 temp6 = 0 : temp5 = 0 ; END CONTEXT ; HERE'S THE KNOCKBACK CODE if !xClip then _skip_offset_horizontal temp6 = ballx - player0x if !bMoveRt then _skip_offset_lf temp5 = temp6 + 4 ballx = ballx - temp5 _skip_offset_lf if !bMoveLf then _skip_offset_horizontal temp5 = 8 - temp6 ballx = ballx + temp5 temp6 = 0 : temp5 = 0 _skip_offset_horizontal if !yClip then _skip_offset_vertical temp6 = ballx - player0y if !bMoveUp then _skip_offset_up temp5 = temp6 + 4 bally = bally - temp5 _skip_offset_up if !bMoveDn then _skip_offset_vertical temp5 = 8 - temp6 bally = bally + temp5 _skip_offset_vertical _skip_ball_knock_back I've included the game source as well. airhockey.bas

Thanks for all your help so far, man! I'm learning a lot here.

Yours seems to compile, but when I copy your collision code into mine, it doesn't, even after changing xy_Clip back to xyClip. What all did you change? Also I can keep the if lines as: if p0_x = 0 then... as p0_x would be zero if the joystick hasn't been moved left or right. Same for p0_y. I was just seeing if it made any difference with the clipping, but it doesn't :\ Could it be due to these lines? if bMoveRt && p0_mv_Rt then goto _skip_to_p0_yCol if bMoveLf && p0_mv_Lf then goto _skip_to_p0_yCol and if bMoveUp && p0_mv_Up then goto _skip_to_bVel_accumulation if bMoveDn && p0_mv_Dn then goto _skip_to_bVel_accumulation