CHIP8 thread - Page 2

P_RePTiLe · November 22nd, 2008

Quote:

Originally Posted by Squall-Leonhart

Simple Directmedia Layer, can connect with any available API in the system, most commonly video implementation connects to OpenGL.

Good work with google

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Dax · November 22nd, 2008

Update: I've got opcodes 0x1[JP addr], 0x2[CALL], 0x6[LD], 0x7[ADD], and 0xB[JP addr + v0] working, more or less, as far as I can tell, so I'm pleased. Still no graphics obviously[I have the emulator in a console app for now, so I can easily see the output without having to mess with SDL text rendering].

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runawayprisoner · November 22nd, 2008

Just a note for the graphics work: it's done using XOR, which means... the ^ operation in C++ and some other languages.

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Dax · November 22nd, 2008

I doubt I'll get to graphics anytime soon. I want to have most of the other opcodes written first.

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**blueshogun96** · November 22nd, 2008

TBH, I think we need threads like this stikied like at emultak.net so we can have one large discussion on the subject of emulating certain systems. This way it will reduce the need to search forums for specific threads and the one thread can link to any specific thread if it poses any relevance.

@daxtsu, there's no such thing as a dumb question when you're trying to learn how to write an emulator and you don't know any better, no matter what!

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runawayprisoner · November 22nd, 2008

Indeed... I agree with that idea. There should be a stickied thread.

And a thread that has links to documents.

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Squall-Leonhart · November 23rd, 2008

Quote:

Originally Posted by P_RePTiLe

Good work with google

I've worked with SDL before,... the Nherve input plugin for ideas.

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P_RePTiLe · November 23rd, 2008

Quote:

Originally Posted by Squall-Leonhart

I've worked with SDL before,... the Nherve input plugin for ideas.

Ah, very well then. Then i just good the wrong idea from your "Do Open-Gl!!!"-post.

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runawayprisoner · November 23rd, 2008

Just an FYI, this might be helpful to you. My debugger log when running Pong. ;p

Code:

// 02A6: 22D4
CALL 02D4 // Call sub-routine at address 02D4 (724) in memory.

// 02D4: A2F2
LD I, 02F2 // Load 02F2 (754 in decimal) into I.

// 02D6: FE33
BCD V[0E] // Load into memory at address I the BCD value of V[0E].

// Value of V[0E]: 00 (0)
// Hundreds: 0
// Tens    : 0
// Units   : 0

// I: 02F2 (754)
// mem[02F2]: 00 (0)
// mem[02F3]: 00 (0)
// mem[02F4]: 00 (0)

// 02D8: F265
LDA 02, I // Load from memory at address I into V[00] to V[02].

// V[00]: 00 (0)
// V[01]: 00 (0)
// V[02]: 00 (0)

// 02DA: F129
LDF I, V[01] // Load into I the address of the 8x5 font with index as value of V[01].

// 02DC: 6414
LD V[04], 0014 // Load 0014 (20) into V[04].

// 02DE: 6500
LD V[05], 0000 // Load 0000 (0) into V[05].

// 02E0: D455
DRW V[04], V[05], 05 // Draw a 8x5 sprite at x=14 (20) and y=00 (0).

// 02E2: 7415
ADD V[04], 0015 // Add 0015 (21) into V[04].

// 02E4: F229
LDF I, V[02] // Load into I the address of the 8x5 font with index as value of V[02].

// 02E6: D455
DRW V[04], V[05], 05 // Draw a 8x5 sprite at x=29 (41) and y=00 (0).

// 02E8: 00EE
RET // Return from sub-routine.

// 02A8: 8E34
ADD V[0E], V[03] // Add V[03] into V[0E].

// 02AA: 22D4
CALL 02D4 // Call sub-routine at address 02D4 (724) in memory.

// 02D4: A2F2
LD I, 02F2 // Load 02F2 (754 in decimal) into I.

// 02D6: FE33
BCD V[0E] // Load into memory at address I the BCD value of V[0E].

// Value of V[0E]: 0A (10)
// Hundreds: 0
// Tens    : 1
// Units   : 0

// I: 02F2 (754)
// mem[02F2]: 00 (0)
// mem[02F3]: 01 (1)
// mem[02F4]: 00 (0)

// 02D8: F265
LDA 02, I // Load from memory at address I into V[00] to V[02].

// V[00]: 00 (0)
// V[01]: 01 (1)
// V[02]: 00 (0)

// 02DA: F129
LDF I, V[01] // Load into I the address of the 8x5 font with index as value of V[01].

// 02DC: 6414
LD V[04], 0014 // Load 0014 (20) into V[04].

// 02DE: 6500
LD V[05], 0000 // Load 0000 (0) into V[05].

// 02E0: D455
DRW V[04], V[05], 05 // Draw a 8x5 sprite at x=14 (20) and y=00 (0).

// 02E2: 7415
ADD V[04], 0015 // Add 0015 (21) into V[04].

// 02E4: F229
LDF I, V[02] // Load into I the address of the 8x5 font with index as value of V[02].

// 02E6: D455
DRW V[04], V[05], 05 // Draw a 8x5 sprite at x=29 (41) and y=00 (0).

// 02E8: 00EE
RET // Return from sub-routine.

Anyway, pay attention to the way BCD works in Pong so you won't run into troubles there. Even Ref ran into troubles with that about 2-3 years ago.

Edit: removed the X's because they were useless.

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Last edited by runawayprisoner; November 23rd, 2008 at 22:45..

Dax · November 27th, 2008

New list of opcodes programmed in[I still don't really have much of a debugger working, so no clue how well they're working]:

Regular C8:

0nnn - SYS addr: Yes(Ignored)
00E0 - CLS: Yes
00EE - RET: Yes
1nnn - JP: Yes
2nnn - CALL: Yes
3xkk - SE: Yes
4xkk - SNE: Yes
5xy0 - SE: Yes
6xkk - LD: Yes
7xkk - ADD: Yes
8xy0 - LD: Yes
8xy1 - OR: Yes
8xy2 - AND: Yes
8xy3 - XOR: Yes
8xy4 - ADD: No
8xy5 - SUB: No
8xy6 - SHR: No
8xy7 - SUBN: No
8xyE - SHL: No
9xy0 - SNE: Yes
Annn - LD: No
Bnnn - JP: Yes
Cxkk - RND: No
Dxyn - DRW: No
Ex9E - SKP: No
ExA1 - SKNP: No
Fx07 - LD: Yes
Fx0A - LD: No
Fx15 - LD: Yes
Fx18 - LD: Yes
Fx1E - ADD: No
Fx29 - LD: No
Fx33 - LD: No
Fx55 - LD: No
Fx65 - LD: No

Total: 18/35

Super C8:
00Cn - SCD: No
00FB - SCR: No
00FC - SCL: No
00FD - EXIT: No
00FE - LOW: No
00FF - HIGH: No
Dxy0 - DRW: No
Fx30 - LD: No
Fx75 - LD: No
Fx85 - LD: No

Total: 0/10

Grand Total: 18/45

Not bad progress if I do say so myself. :3

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runawayprisoner · November 28th, 2008

Why is CLS implemented... but DRW (or SPRITE in some other docs) not? ;p

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Phil · November 28th, 2008

becuase he made it on a computer, and not an Eee. Rap, where have you been hiding??

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Dax · November 28th, 2008

RAP: It's not really implemented per se, it's just a printf/cout that says, "OMG CLEAR THE SCREEN", which is about all you can do with a console window[unless of course you DO really clear the screen..], so nyah.

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Last edited by Dax; November 28th, 2008 at 11:28..

runawayprisoner · November 28th, 2008

Quote:

Originally Posted by Phil

becuase he made it on a computer, and not an Eee. Rap, where have you been hiding??

Under a ton of Gameboy documents.

Now I have the opcode table sorted... (damn, that was a mess)

Quote:

Originally Posted by daxtsu

RAP: It's not really implemented per se, it's just a printf/cout that says, "OMG CLEAR THE SCREEN", which is about all you can do with a console window[unless of course you DO really clear the screen..], so nyah.

Knew it.

Make a debugger that prints out the specific commands and what it does... for every byte in the rom first. A loop detector (something that jumps to itself is an endless loop that indicates it's the end of the software) might be nice.

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Dax · December 7th, 2008

:o My thread got stickied! I'll update the first post with links to useful CHIP8 stuff when I get a chance. As far as progress on the emu goes, I haven't touched it with a 99999 foot/metre pole lately, so no updates yet.

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**cottonvibes** · December 7th, 2008

Quote:

Originally Posted by daxtsu

:o My thread got stickied! I'll update the first post with links to useful CHIP8 stuff when I get a chance. As far as progress on the emu goes, I haven't touched it with a 99999 foot/metre pole lately, so no updates yet.

well maybe now that its stickied it'll give you the motivation you need to finish it?

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Dax · December 7th, 2008

xD We'll see. I've been busy with real life. :<

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runawayprisoner · December 7th, 2008

You should try to finish this project. You would learn a lot from it, I think.

Maybe I'll start contributing some technical data as well, as soon as I'm finished with my other project (Gameboy).

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serge2k · December 28th, 2008

I've decided to get back to mine after playing nothing but emulated games for a few days (I'm at my mom's, computer is at home)

The biggest problem I had with mine was graphics. everything I tried was ridiculously slow or just didn't work.

I'm going to attempt again using C++ and SDL (as soon as microsoft approves another visual studio download).

I'm just wondering if anyone has some good resources for graphics? I used NeHe's opengl tutorials, is that the best for this or is there an easier way?

dreampeppers99 · December 30th, 2008

Quote:

Originally Posted by serge2k

The biggest problem I had with mine was graphics. everything I tried was ridiculously slow or just didn't work.

I used the Graphics.drawLine from Java 2D API and it ran very fast... ( I didn't find the one setPixel on Graphics

then I coded with drawLine. )

However if the things stay hard... made this abstract as Refraction firstly just draw * to background and # to objects.

**#*****
*##*****
**#*****
**#*****
*###****

Or another one that you wish.

My main screen ...

The debugger step by step with pong

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Last edited by dreampeppers99; December 30th, 2008 at 19:13..

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November 22nd, 2008	#22 (permalink)
Dax ライチュウ Join Date: Nov 2006 Location: USA Posts: 3,289	Update: I've got opcodes 0x1[JP addr], 0x2[CALL], 0x6[LD], 0x7[ADD], and 0xB[JP addr + v0] working, more or less, as far as I can tell, so I'm pleased. Still no graphics obviously[I have the emulator in a console app for now, so I can easily see the output without having to mess with SDL text rendering]. __________________ My PC Specs\|My Consoles\|Emu SVNs\|Project OSX\|How to ask a Question

November 22nd, 2008	#23 (permalink)
runawayprisoner Mobile Fanatic Join Date: Nov 2006 Location: Santa Cruz, CA Posts: 6,205	Just a note for the graphics work: it's done using XOR, which means... the ^ operation in C++ and some other languages. __________________ cChip interpreter WIP - current status: Release Candidate LRx Filter RC - current performance rating: 9/10

November 22nd, 2008	#24 (permalink)
Dax ライチュウ Join Date: Nov 2006 Location: USA Posts: 3,289	I doubt I'll get to graphics anytime soon. I want to have most of the other opcodes written first. __________________ My PC Specs\|My Consoles\|Emu SVNs\|Project OSX\|How to ask a Question

November 22nd, 2008	#25 (permalink)
blueshogun96 Emu author Join Date: Jun 2004 Location: Unidentified Posts: 2,508	TBH, I think we need threads like this stikied like at emultak.net so we can have one large discussion on the subject of emulating certain systems. This way it will reduce the need to search forums for specific threads and the one thread can link to any specific thread if it poses any relevance. @daxtsu, there's no such thing as a dumb question when you're trying to learn how to write an emulator and you don't know any better, no matter what! __________________ [Sagat] Windows XP x64 Pro \| AMD Athlon 3000+ (~2.0GHz) \| NVIDIA GeForce 6600 PCI-E \| Realtek AC97 Audio \| 512MB Ram \| NVIDIA NForce 4-4X chipset \| Seagate HDD 160GB \| LG 8614 DVD-ROM \| HP DVD 1040d CD/DVD -/+ RW w/ LightScribe [Raylene] HP dv2000 \| Windows Vista Home Premium \| Intel Core2 Duo @2.2GHz \| NVIDIA GeForce 8400 GS 128Mb (Dedicated) + 1264Mb (Shared) \| 3GB Ram \| 220GB HDD GeneralEmu - December 27, 2005 and beyond! Shogun3D Interactive (I try to update it every day now) Shogun's Cxbx Dev Blog

November 22nd, 2008	#26 (permalink)
runawayprisoner Mobile Fanatic Join Date: Nov 2006 Location: Santa Cruz, CA Posts: 6,205	Indeed... I agree with that idea. There should be a stickied thread. And a thread that has links to documents. __________________ cChip interpreter WIP - current status: Release Candidate LRx Filter RC - current performance rating: 9/10

November 27th, 2008	#30 (permalink)
Dax ライチュウ Join Date: Nov 2006 Location: USA Posts: 3,289	New list of opcodes programmed in[I still don't really have much of a debugger working, so no clue how well they're working]: Regular C8: 0nnn - SYS addr: Yes(Ignored) 00E0 - CLS: Yes 00EE - RET: Yes 1nnn - JP: Yes 2nnn - CALL: Yes 3xkk - SE: Yes 4xkk - SNE: Yes 5xy0 - SE: Yes 6xkk - LD: Yes 7xkk - ADD: Yes 8xy0 - LD: Yes 8xy1 - OR: Yes 8xy2 - AND: Yes 8xy3 - XOR: Yes 8xy4 - ADD: No 8xy5 - SUB: No 8xy6 - SHR: No 8xy7 - SUBN: No 8xyE - SHL: No 9xy0 - SNE: Yes Annn - LD: No Bnnn - JP: Yes Cxkk - RND: No Dxyn - DRW: No Ex9E - SKP: No ExA1 - SKNP: No Fx07 - LD: Yes Fx0A - LD: No Fx15 - LD: Yes Fx18 - LD: Yes Fx1E - ADD: No Fx29 - LD: No Fx33 - LD: No Fx55 - LD: No Fx65 - LD: No Total: 18/35 Super C8: 00Cn - SCD: No 00FB - SCR: No 00FC - SCL: No 00FD - EXIT: No 00FE - LOW: No 00FF - HIGH: No Dxy0 - DRW: No Fx30 - LD: No Fx75 - LD: No Fx85 - LD: No Total: 0/10 Grand Total: 18/45 Not bad progress if I do say so myself. :3 __________________ My PC Specs\|My Consoles\|Emu SVNs\|Project OSX\|How to ask a Question

November 28th, 2008	#31 (permalink)
runawayprisoner Mobile Fanatic Join Date: Nov 2006 Location: Santa Cruz, CA Posts: 6,205	Why is CLS implemented... but DRW (or SPRITE in some other docs) not? ;p __________________ cChip interpreter WIP - current status: Release Candidate LRx Filter RC - current performance rating: 9/10

November 28th, 2008	#32 (permalink)
Phil Regular User ;) Join Date: Oct 2007 Location: Naples Florida Posts: 9,964	becuase he made it on a computer, and not an Eee. Rap, where have you been hiding?? __________________ A Mac is like an escort, you pay a ton and get nothing. A PC is like a hooker, it's a lot cheaper and gives you what you're after.. and if unlucky some diseases as well, that's why you gotta use protection. -CC

November 28th, 2008	#33 (permalink)
Dax ライチュウ Join Date: Nov 2006 Location: USA Posts: 3,289	RAP: It's not really implemented per se, it's just a printf/cout that says, "OMG CLEAR THE SCREEN", which is about all you can do with a console window[unless of course you DO really clear the screen..], so nyah. __________________ My PC Specs\|My Consoles\|Emu SVNs\|Project OSX\|How to ask a Question Last edited by Dax; November 28th, 2008 at 11:28..

December 7th, 2008	#35 (permalink)
Dax ライチュウ Join Date: Nov 2006 Location: USA Posts: 3,289	:o My thread got stickied! I'll update the first post with links to useful CHIP8 stuff when I get a chance. As far as progress on the emu goes, I haven't touched it with a 99999 foot/metre pole lately, so no updates yet. __________________ My PC Specs\|My Consoles\|Emu SVNs\|Project OSX\|How to ask a Question

December 7th, 2008	#37 (permalink)
Dax ライチュウ Join Date: Nov 2006 Location: USA Posts: 3,289	xD We'll see. I've been busy with real life. :< __________________ My PC Specs\|My Consoles\|Emu SVNs\|Project OSX\|How to ask a Question

December 7th, 2008	#38 (permalink)
runawayprisoner Mobile Fanatic Join Date: Nov 2006 Location: Santa Cruz, CA Posts: 6,205	You should try to finish this project. You would learn a lot from it, I think. Maybe I'll start contributing some technical data as well, as soon as I'm finished with my other project (Gameboy). __________________ cChip interpreter WIP - current status: Release Candidate LRx Filter RC - current performance rating: 9/10

December 28th, 2008	#39 (permalink)
serge2k Registered User Join Date: Sep 2006 Location: surrey Posts: 45	I've decided to get back to mine after playing nothing but emulated games for a few days (I'm at my mom's, computer is at home) The biggest problem I had with mine was graphics. everything I tried was ridiculously slow or just didn't work. I'm going to attempt again using C++ and SDL (as soon as microsoft approves another visual studio download). I'm just wondering if anyone has some good resources for graphics? I used NeHe's opengl tutorials, is that the best for this or is there an easier way?