Thread: CHIP8 thread
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Old January 8th, 2009   #49 (permalink)
dreampeppers99
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I'm having problems with my Schip8 "emulator".
The Chip8 games runs fine and runs schip8 games too but in the schip the "screen" is presented with some strange cuts ... look the "pac man" and "ant" (the ant game doesn't show the "land" too...)

The dragon2 seems to have some issues too...


Then I thought this could be a Scroll error stuff and I made this test (below) but the results seems to be correct.
Code:
 Processor cpu = new Processor();
        int initialAddress = 0x200;

        Engine videoMock =new Engine(cpu);
        Emulator.setVideo(videoMock);
        Emulator.init();
        
        cpu.dataRegister.V[1] = 0x0; //x
        cpu.dataRegister.V[2] = 0x0; //y
        cpu.addressRegisterI = 0x20A; //initial sprit 16x16
        
        cpu.getMemory().writeAt(initialAddress++, (short)0x00); //setting schip mode
        cpu.getMemory().writeAt(initialAddress++, (short)0xFF);
        cpu.getMemory().writeAt(initialAddress++, (short)0xD1); //draw 1 2 16x16 from 0x20A
        cpu.getMemory().writeAt(initialAddress++, (short)0x20);
        cpu.getMemory().writeAt(initialAddress++, (short)0x00); //scroll down 1
        cpu.getMemory().writeAt(initialAddress++, (short)0xC1);
        cpu.getMemory().writeAt(initialAddress++, (short)0x00); //scroll 4 to rigth
        cpu.getMemory().writeAt(initialAddress++, (short)0xFB);
        cpu.getMemory().writeAt(initialAddress++, (short)0x00); //scroll 4 to left
        cpu.getMemory().writeAt(initialAddress++, (short)0xFC);
        cpu.getMemory().writeAt(initialAddress++, (short)0x80); //10000000
        cpu.getMemory().writeAt(initialAddress++, (short)0xFF); //11111111
        cpu.getMemory().writeAt(initialAddress++, (short)0x80); //10000000
        cpu.getMemory().writeAt(initialAddress++, (short)0xFF); //11111111
        cpu.getMemory().writeAt(initialAddress++, (short)0x80); //10000000
        cpu.getMemory().writeAt(initialAddress++, (short)0xFF); //11111111
        cpu.getMemory().writeAt(initialAddress++, (short)0x80); //10000000
        cpu.getMemory().writeAt(initialAddress++, (short)0xFF); //11111111
        cpu.getMemory().writeAt(initialAddress++, (short)0x80); //10000000
        cpu.getMemory().writeAt(initialAddress++, (short)0xFF); //11111111
        cpu.getMemory().writeAt(initialAddress++, (short)0x80); //10000000
        cpu.getMemory().writeAt(initialAddress++, (short)0xFF); //11111111
        cpu.getMemory().writeAt(initialAddress++, (short)0x80); //10000000
        cpu.getMemory().writeAt(initialAddress++, (short)0xFF); //11111111
        cpu.getMemory().writeAt(initialAddress++, (short)0x80); //10000000
        cpu.getMemory().writeAt(initialAddress++, (short)0xFF); //11111111

        cpu.step(); //set high
        cpu.step(); //false draw, just put the 1s and 0s on matrix
        print(videoMock.getFrame()); // take a snapshot, 1

        cpu.step(); //scroll down 1
        print(videoMock.getFrame()); // take a snapshot, 2

        cpu.step(); //scroll 4 or 2 for rigth
        print(videoMock.getFrame()); // take a snapshot, 3

        cpu.step(); //scroll 4 or 2 for left
        print(videoMock.getFrame()); // take a snapshot, 4

Snapshot 1 (just draw)
======================================== =======================================
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|

Snapshot 2 (scroll down 1)
======================================== =======================================
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|

Snapshot 3 (scroll rigth 4/2)
======================================== =======================================
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|

Snapshot 4 (scroll left 4/2)
======================================== =======================================
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
1|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|
0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0| 0|0|0|0|0|0|0|0|0|0|0|0|0|

Im my "loggin" system shows...
[VideoEngine] ERROR: Pixel[1] --> it couldn't be happen' x=132,y=31
[VideoEngine] ERROR: Pixel[1] --> it couldn't be happen' x=132,y=32
[VideoEngine] ERROR: Pixel[1] --> it couldn't be happen' x=132,y=30
....
So I think it can be a error of my part make the boundary over 131 (0-132).
You guys mark pixel on this coordinate?


Best regards,
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Last edited by dreampeppers99; January 8th, 2009 at 20:30.. Reason: additional information
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