Chip 8

[zenogais]

looks interesting, how would that MoMtoR Method look like?

Thats an exercise best left up to the person making the dynarec, I give most of the necessary info in my tutorial. Its merely a matter of emitting the opcode and its parameters. Using the NASM or Intel documents you should be able to do that.

 

[extro]

Thats an exercise best left up to the person making the dynarec, I give most of the necessary info in my tutorial. Its merely a matter of emitting the opcode and its parameters. Using the NASM or Intel documents you should be able to do that.

I had a look a the dynarec stuff from pearpc (http://pearpc.sourceforge.net), which looks real nice. I think I got it now

 

[extro]

@zenogais did you have a look at this pearpc stuff? It would be interesting how good the implementation of their dynarec stuff is.

 

[Marce1991]

what is needed to make the 8 chip emu?e.g.
-cpu
-opcodes
And I'd need some help with directX, anyone knows a good tutorial except goldroad thx in advance

 

[refraction]

read the whole thread, everything you need is in this thread, i know theres a few pages, plus dont be lazy please, all is explained.

 

[Marce1991]

ok ok sorry

 

[bcrew1375]

Good luck, Marce. Chip 8 is really easy to start with, hopefully it goes smooth. If you need help, we're here(or at least I am, I can't say for the other guys ).

 

[Doomulation]

We do check the board reguarly... yes...
If you have trouble, we'll gladly help.

 

[Falcon4ever]

what is needed to make the 8 chip emu?e.g.
-cpu
-opcodes
And I'd need some help with directX, anyone knows a good tutorial except goldroad thx in advance

I've seen several posts of you at this forum and actually i think you should do some win32 api programming first. Then if you want to learn dx try searching for "drunken hyena tutorial" which has one of the best dx/d3d tutorials.

the cpu/opcodes can easily be found here:
http://members.aol.com/autismuk/chip8/chip8def.htm
and that's all you need...

i did my chip8 in 5 days or smth...

 

[aprentice]

graphic filters for chip8 could be a good idea

 

[Doomulation]

Directx isn't that hard especially if you cope the tutorials. I think it's actually easier than the stupid win32 api. But then again, I've never really used gdi...

 

[Falcon4ever]

Directx isn't that hard especially if you cope the tutorials. I think it's actually easier than the stupid win32 api. But then again, I've never really used gdi...

Drawing with win32api/GDI isn't hard at all just get a good book such as
"Charles Petzold - Programming Windows".

The only reason why i used directdraw instead of gdi is because i can draw using a back buffer (less flicker and you don't see pixels being set).

 

[Doomulation]

Programming with directx isn't that hard. Hell, there's even tutorials in the documentation! They work pretty good for a simple emu such as chip8

 

[MarcelCe]

Hi

Hi.
I am trying to code an chip 8 interpreter in Java.
The probleme is that i have wrong timings in games..
I want to slow down the speed for example to just 1000 opcodes per second..
i dont get it right i tried gettickcount , but i dont know the right algo.

Maybe somebody has a tipp for me ? tnx.

:alien2:


P.S Is there a good way to eleminate the sprite flicker problem ?

Cya :bunny:

 

[refraction]

this is the kind of thing you need to slow it down

DWORD lt = GetTickCount();
for(;cpurunning
{
if(GetTickCount() - lt >= 1000/60)
{
lt=GetTickCount();
//execute 1 op here
}
}

(found that in another thread)

as for the flickering, the sprites are wiped every other frame, so maybe if you only drew every second frame to the screen, i spose in a way that would eliminate it...

it was an original problem for the chip8 system, so dont think its your fault

 

[hap]

Did anyone have problems getting Spacefight to run correctly ?

The enemy sprites were not being properly redrawn here, and I've currently fixed that by adding a carry check in fX1e, as the game seems to expect the carry to be unset somewhere. But I don't know if this would be the correct solution. All other roms seem to work fine with or without it.

 

[Doomulation]

Refraction noticed that at least one game used some special algorithm to make the butterfly or whatever it was fly around the screen. Can't remember the name. Myself, I did not implemt this.

 

[refraction]

yeh i think i got it to work, goto www.zenogais.net and look at projects, the NeoChip8 emulator i worked on him with, got to probably about the stage you're at now with it before he finished it, but sources are there, check your carrys tho, they are a bit tricky

 

[hap]

Doomulation: that would be 'Field'. it, and many other games, look nicer if you implement horizontal and vertical sprite wrapping. what i mean with this is that if you'd draw a 2 by 2 square at 127,63 (bottom right), it would show as 4 pixels; one in each corner of the screen. Blitz has problems with vertical wrapping though, so i've made wrapping optional here.

refraction: your emulator seems to have the same problem in spacefight i had: when you shoot an enemy, sometimes its sprite won't be deleted, and causes a mess on the screen, as well as gameplay problems.

 

[refraction]

Doomulation: that would be 'Field'. it, and many other games, look nicer if you implement horizontal and vertical sprite wrapping. what i mean with this is that if you'd draw a 2 by 2 square at 127,63 (bottom right), it would show as 4 pixels; one in each corner of the screen. Blitz has problems with vertical wrapping though, so i've made wrapping optional here.

refraction: your emulator seems to have the same problem in spacefight i had: when you shoot an enemy, sometimes its sprite won't be deleted, and causes a mess on the screen, as well as gameplay problems.

hmm, lemme check my build, im sure mine worked, he must have killed it again ;p

edit: oic what you mean, when you kill them... very odd!, but ANT works, gotta be the best game on Schip8 ;p