CHIP8 thread

[strike105x]

Great going ^^ nice to see your progressing with your emu .

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[Phil]

Cant wait to try the finished product

[masta.g.86]

Nice work, Dax.

NOW GET TO WORK ON MY PS3 EMU! (the noobz are getting restless)

<cracks whip>

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[Dax]

Blitz shows BBBBB instead of BLITZ and goes ingame, and gives you a game over 3 seconds into it. I'm looking into why. If my frequent updates annoy you, let me know. I just think it's cool to stay in touch.

Edit: BBBBB bug fixed. Was an error in my addition code. Now to figure out why Space Invaders' marquee is garbled.

Edit 2: Space Invaders Marquee was garbled due to the Fx65 opcode not checking for <= 0, instead of < 0, so it skipped the loop. Now it's perfect!

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Last edited by Dax; April 2nd, 2009 at 09:43..

[Dax]

Minor update: I'm having a bug with my input: If you hold down any keys in pong, then you cannot move the opposite paddle. Why is my input limited to one "movement" at a time? Any ideas are welcome.

void get_input(void)
{
	static BYTE keystate[256];
	dx_keyboard->GetDeviceState(256, (LPVOID)keystate);

	for(i = 0x0; i <= 0xF; i++)
		keys_pressed[i] = false;

	//if the keys are down..
	if(keystate[DIK_X] & 0x80)
		keys_pressed[0x0] = true;
	if(keystate[DIK_1] & 0x80)
		keys_pressed[0x1] = true;
	if(keystate[DIK_2] & 0x80)
		keys_pressed[0x2] = true;
	if(keystate[DIK_3] & 0x80)
		keys_pressed[0x3] = true;
	if(keystate[DIK_Q] & 0x80)
		keys_pressed[0x4] = true;
	if(keystate[DIK_W] & 0x80)
		keys_pressed[0x5] = true;
	if(keystate[DIK_E] & 0x80)
		keys_pressed[0x6] = true;
	if(keystate[DIK_A] & 0x80)
		keys_pressed[0x7] = true;
	if(keystate[DIK_S] & 0x80)
		keys_pressed[0x8] = true;
	if(keystate[DIK_D] & 0x80)
		keys_pressed[0x9] = true;
	if(keystate[DIK_Z] & 0x80)
		keys_pressed[0xA] = true;
	if(keystate[DIK_C] & 0x80)
		keys_pressed[0xB] = true;
	if(keystate[DIK_4] & 0x80)
		keys_pressed[0xC] = true;
	if(keystate[DIK_R] & 0x80)
		keys_pressed[0xD] = true;
	if(keystate[DIK_F] & 0x80)
		keys_pressed[0xE] = true;
	if(keystate[DIK_V] & 0x80)
		keys_pressed[0xF] = true;

	//resets the CPU
	if(keystate[DIK_F3] & 0x80)
	{
		//prevent multiple resets
		if(!f3_locked)
		{
			CLS();
			ResetMemory(false);
		}
		
	}
	if(!(keystate[DIK_F3] & 0x80))
		f3_locked = false;
	
	//quit
	if(keystate[DIK_ESCAPE] & 0x80)
	{
		int_AppRunning = 0;
		return;
	}

	//pause the emu if not locked
	if(keystate[DIK_P] & 0x80)
	{
		if(!p_locked)
		{
			p_locked = true;
			pause = !pause;
		}
	}
	if(!(keystate[DIK_P] & 0x80))
		p_locked = false;
}

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[jaskt7]

Originally Posted by Dax

	for(i = 0x0; i <= 0xF; i++)
		keys_pressed[i] = false;

I think it might have to do with this part of your code. The getInput function, are you calling it everytime? If so, this is erasing all of your currently pressed keys. When a key gets released, set it to false instead of clearing all of the keys everytime.

[Dax]

From what I remember, having the additional 16 ifs instead of the for made no difference. And yeah, I call it just before executing anything in my main loop.

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[jaskt7]

Have you tried printing out the keystate array to see if there is multiple keys pressed?

[Chrono Archangel]

hehe Dax you made me decide to fix my input stuff.
I used GetAsyncKeyState to poll the keys i need in the 3 instructions and now my paddles in pong seem to be working fine. (i think i remember seeing them move at the same time)

some stuff i need to fix:
- crash when pong goes up to 10 (displays A, then crashes with out-of-bound array error)
- timing... emu goes too fast
-space invaders displays only half the ship (wtf?)

minor stuff... when that's done I'll work on Gekko XD

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Last edited by Chrono Archangel; April 3rd, 2009 at 13:52..

[Hatorijr]

way i handled timing was that i set up a timer object(did mine in c#) that called my op decoding function once per frame for 60 frames while testing which basically was 60 ops per second and when i finished the emulator i boosted it to run that function 10 times per frame so the finished version runs at around 600 ops per second.

[Dax]

I'm restructuring my emu currently, so that I can learn about plugins and stuff. I'm really going out of my way with this first emu to make sure I have the knowledge I need for later endeavours. My source is also now available for viewing at chip8-emu - Google Code if anyone cares.

Edit: Make sure to check out recent revisions if you end up wanting the code for whatever reason. The ones from March 09 and earlier are old broken code that never worked.
Edit2: Note that the source doesn't work in its current state.

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Last edited by Dax; April 4th, 2009 at 17:05..

[omegadox]

Good work on the core Dax :P. Now to sort the DirectX crap :P.

[Dax]

xD Thanks. Big thanks to Omegadox for organizing the project so nicely. It uses a similar format to Dolphin now, which is a very clean project it seems.

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[omegadox]

Originally Posted by Dax

xD Thanks. Big thanks to Omegadox for organizing the project so nicely. It uses a similar format to Dolphin now, which is a very clean project it seems.

Yep, I took the idea from Dolphin mostly. Separating things to their own lib.

[Dax]

Now I just have to figure out how to link this stuff together. Never had a project this way before..

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[omegadox]

Just set the "Additional Library" to include the path to the libs you are using.

[jaskt7]

I found out that something was wrong with the graphics in my original flash chip8 emu (it didn't wrap). Anyways, my goal now is to add support for schip. One problem though, BLINKY is having serious issues. Basically, the graphics are not drawing correctly. The link below will bring you to the page with the swf file on it and the complete code. Any answers will be appreciated.

chip

Also, i posted a while back about a chip8 to action script converter. I was wondering if anybody tried it out? The link for that again is below. (you have to have flash to do this)

http://babbage.cs.missouri.edu/~jask...m=breakout.ch8


Thanks,
Justin

[Hatorijr]

why not post a picture so we can see whats going on with it?

[runawayprisoner]

Massive reply!!

Originally Posted by masta.g.86

NOW GET TO WORK ON MY PS3 EMU!

Ask IBM to release an opcode table for the Cell BE. That'll be a good first step.

Originally Posted by Chrono Archangel

hehe Dax you made me decide to fix my input stuff.
I used GetAsyncKeyState to poll the keys i need in the 3 instructions and now my paddles in pong seem to be working fine. (i think i remember seeing them move at the same time)

some stuff i need to fix:
- crash when pong goes up to 10 (displays A, then crashes with out-of-bound array error)
- timing... emu goes too fast
-space invaders displays only half the ship (wtf?)

minor stuff... when that's done I'll work on Gekko XD

When pong goes up to 10 and crashes, you need to check your BCD implementation to see if it's not punching out weird stuffs, then when that suspect is cleared, check your font-fetching routine. I remember seeing a font-check rom somewhere on Zophar. That would be a good one for this kind of test. If everything goes fine, check your arithmetic flags.

For Space Invaders, it's recommended that you check your flag like tomorrow is apocalypse. Additionally, it can also be a problem with the way you fetch the next bits for drawing, so look closely there. Make sure you're fetching exactly 8 bits per scanline for the sprite.

For timing... well, there's none. Chip-8 or Super Chip have no timing. The only timings you have are the DT and the ST. If you feel like your emulator is running too fast, use a timer to execute codes only at intervals. Alternatively, poll useless stuffs in between instructions... such as extra drawing routines, extra screen buffer filters... etc...

Originally Posted by jaskt7

I found out that something was wrong with the graphics in my original flash chip8 emu (it didn't wrap). Anyways, my goal now is to add support for schip. One problem though, BLINKY is having serious issues. Basically, the graphics are not drawing correctly. The link below will bring you to the page with the swf file on it and the complete code. Any answers will be appreciated.

chip

Also, i posted a while back about a chip8 to action script converter. I was wondering if anybody tried it out? The link for that again is below. (you have to have flash to do this)

http://babbage.cs.missouri.edu/~jask...m=breakout.ch8


Thanks,
Justin

Better research ActionScript 3.0 while you're at it. ActionScript 3.0 adds ByteArray, which would be more useful (and takes up less memory) than an array of numbers or integers.

Another good feature would be the graphics interface, which makes drawing vector graphics much less painful than it was back in ActionScript 2.0.

Originally Posted by Hatorijr

why not post a picture so we can see whats going on with it?

Um... you could just click on his link to go see the source code and the emulator itself.

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[jaskt7]

Originally Posted by runawayprisoner

...Better research ActionScript 3.0 while you're at it. ActionScript 3.0 adds ByteArray, which would be more useful (and takes up less memory) than an array of numbers or integers.

Another good feature would be the graphics interface, which makes drawing vector graphics much less painful than it was back in ActionScript 2.0....

I know a little bit of AS 3.0 (from the attempt to convert my AS 2.0 Stratego game to it), but my concern right now is just getting it to work. Also, I am not to concerned about memory since CHIP8 games are so small in the first place.