chip8 emulator --- help needed ---

wannabecoder · April 7th, 2007, 12:19

Allrightz.
Im sure thats the right place to ask my questions(

).

Here we go!.

First of all , i wanna let you know that im Pascal(delphi) programmer (most) , but i also have basic knowledge of c++(my first "finished" program was a spaceshooter using SDL library...also a noobish opengl application with some falling cubes.. if that counts) and php/sql/js.

I think thats enough for now...now , please answer my questions.

1)
Can i use the console to draw stuff?or its important to use an api?(dx/sdl/gl)

2)
Can you explain me what does the following code ?

Quote:

if ((Opcode >> 4) & 0xf)
{
-....
}

what does the ">>" and "&" operator?
Can you give a basic example so i can understand it?

3) How can i use a "u8" variable?

Thats all (for now)...:

Last edited by wannabecoder; April 7th, 2007 at 12:28..

**Falcon4ever** · April 7th, 2007, 13:49

1. you can use whatever you want. Some people have used the console for it, but imo you should just try using a simple framework build with directdraw or SDL.

2. Shift the opcode 4 bits to the right and perform an AND operation with 0xF
(An introduction to bitwise operators - The Code Project - C++ / MFC)

Code:

   
  00110010  - some opcode
& 00001111  - & 0xF
  ----------
  00000010  - result

3. just add the type definition yourself: typedef unsigned char u8;

http://emutalk.net/showthread.php?t=19894 <- a great thread for general information about chip8 emu programming.

Last edited by Falcon4ever; April 7th, 2007 at 13:56..

**refraction** · April 7th, 2007, 16:40

just to make what Falcon said more visible, ill do what that line says

Code:

  00110010  - some opcode
  00000011  - some opcode shifted right (>>) 4 bits
& 00001111  - & 0xF
  ----------
  00000011  - result

__________________

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Dont PM me for help, use the forums, thats what its for!

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wannabecoder · April 7th, 2007, 22:50

Thanks alot!
Im so happy that i found people that can actually help me in such advanced stuff!.

Very cool!

**Chrono Archangel** · April 8th, 2007, 00:09

Alot of people here made a Chip8 emu (including me

) so if you have any questions, dont be shy

Welcome to Emuforums btw

__________________

6BIT - Gaming, Emulation & Tech News

April 7th, 2007, 13:49	#2
Falcon4ever Plugin coder / Betatester Join Date: Jun 2003 Posts: 323	1. you can use whatever you want. Some people have used the console for it, but imo you should just try using a simple framework build with directdraw or SDL. 2. Shift the opcode 4 bits to the right and perform an AND operation with 0xF (An introduction to bitwise operators - The Code Project - C++ / MFC) Code: 00110010 - some opcode & 00001111 - & 0xF ---------- 00000010 - result 3. just add the type definition yourself: typedef unsigned char u8; http://emutalk.net/showthread.php?t=19894 <- a great thread for general information about chip8 emu programming. Last edited by Falcon4ever; April 7th, 2007 at 13:56..

April 7th, 2007, 16:40	#3
refraction PCSX2 Coder $refraction's Avatar$ Join Date: Jan 2004 Location: Plymouth, UK Posts: 10,037	just to make what Falcon said more visible, ill do what that line says Code: 00110010 - some opcode 00000011 - some opcode shifted right (>>) 4 bits & 00001111 - & 0xF ---------- 00000011 - result __________________ http://www.pcsx2.net Intel i7 920 @ 3.4Ghz, POV GTX 570 1.3Gb, 1.8Tb HD space, 6Gb OCZ Reaper PC3-14400 Triple Channel Dont PM me for help, use the forums, thats what its for! My Chip16 Emulator RefChip16 http://code.google.com/p/refchip16/
$refraction is offline$

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April 7th, 2007, 22:50	#4
wannabecoder Registered User Join Date: Apr 2007 Location: -_-ffs Posts: 2	Thanks alot! Im so happy that i found people that can actually help me in such advanced stuff!. Very cool!

April 8th, 2007, 00:09	#5
Chrono Archangel 6BIT Join Date: Dec 2001 Location: Montreal, Canada Posts: 8,090	Alot of people here made a Chip8 emu (including me ) so if you have any questions, dont be shy Welcome to Emuforums btw __________________ 6BIT - Gaming, Emulation & Tech News