jsdoでchip8　その7

#概要

jsdoでchip8やってみた。
開発環境を整備してみた。
アセンブラとディスアセンブラを合体した。

#写真

![image](https://qiita-image-store.s3.amazonaws.com/0/18104/7aedbaed-3170-c77c-11ad-457ce830030b.png)


#サンプルコード


```
function _arrayBufferToBase64(buffer) {
    var binary = '';
    var bytes = new Uint8Array(buffer);
    var len = bytes.byteLength;
    for (var i = 0; i < len; i++) 
    {
        binary += String.fromCharCode(bytes[i]);
    }
    return window.btoa(binary);
}
function tob(url) {
    var bin = atob(url);
    var buffer = new Uint8Array(bin.length);
    for (var i = 0; i < bin.length; i++)
    {
  	    buffer[i] = bin.charCodeAt(i);
    }
    var blob = new Blob([buffer.buffer], {
        type : 'application/octet-binary'
    });
    var blob_url = window.URL.createObjectURL(blob);
    return blob_url;
}
function run() {
	var c1, 
        c2, 
        c3, 
        a, 
        i, 
        j;
	var pc = 0;
    var la = new Array(10);
	var r = new Array(100);
    var src = document.getElementById('src0').value;
	var m = src.split("\n");
	for (j = 0; j < m.length; j++)
	{
        var cm = m[j].split("  ");
		if (cm[0] != "")
        {
            la[cm[0]] = pc;
        }
		switch (cm[1])
		{
        case "scroll":
            r[pc] = 0x00;
			pc++;
			r[pc] = 0xC6;
            pc++;   
        break;        
		case "disp":
            var x = 0;
            switch (cm[2])
		    {
		    case "v0":
                x = 0;
            break;
            case "v1":
                x = 1;
            break;        
            case "v2":
                x = 2;
            break;        
            case "v3":
                x = 3;
            break;        
            case "v4":
                x = 4;
            break;        
            case "v5":
                x = 5;
            break;
            case "v6":
                y = 6;
            break;            
            case "v7":
                x = 7;
            break;        
            case "v8":
                x = 8;
            break;        
            case "v9":
                x = 9; 
            break;        
            case "v10":
                x = 10;
            break;        
            case "v11":
                x = 11;
            break;        
            case "v12":
                x = 12;
            break;        
            case "v13":
                x = 13;
            break;        
            case "v14":
                x = 14;
            break;        
            case "v15":
                x = 15;
            break;        
            }
            var y = 0;
            switch (cm[3])
		    {
		    case "v0":
                y = 0;
            break;        
            case "v1":
                y = 1;
            break;        
            case "v2":
                y = 2;
            break;        
            case "v3":
                y = 3;
            break;        
            case "v4":
                y = 4;
            break;        
            case "v5":
                y = 5;
            break;
            case "v6":
                y = 6;
            break;            
            case "v7":
                y = 7;
            break;        
            case "v8":
                y = 8;
            break;        
            case "v9":
                y = 9;
            break;        
            case "v10":
                y = 10;
            break;        
            case "v11":
                y = 11;
            break;        
            case "v12":
                y = 12;
            break;        
            case "v13":
                y = 13;
            break;        
            case "v14":
                y = 14;
            break;        
            case "v15":
                y = 15;
            break;        
            }    
            r[pc] = 0xD0 + x;
			pc++;
			r[pc] = y * 16 + Number(cm[4]);
            pc++;
		break;
		case "add":
            if (cm[2] == "I")
            {
                var x = 0;
                switch (cm[3])
		        {
		        case "v0":
                    x = 0;
                break;        
                case "v1":
                    x = 1;
                break;        
                case "v2":
                    x = 2;
                break;        
                case "v3":
                    x = 3;
                break;        
                case "v4":
                    x = 4;
                break;        
                case "v5":
                    x = 5;
                break;  
                case "v6":
                    y = 6;
                break;            
                case "v7":
                    x = 7;
                break;        
                case "v8":
                    x = 8;
                break;        
                case "v9":
                    x = 9;
                break;        
                case "v10":
                    x = 10;
                break;        
                case "v11":
                    x = 11;
                break;        
                case "v12":
                    x = 12;
                break;        
                case "v13":
                    x = 13;
                break;        
                case "v14":
                    x = 14;
                break;        
                case "v15":
                    x = 15;
                break;        
                }
                r[pc] = 0xF0 + x;
		    	pc++;
			    r[pc] = 0x1E;
			    pc++;
            }
            else if (cm[3].indexOf("v") > -1)
            {
                var x = 0;
                switch (cm[2])
		        {
		        case "v0":
                    x = 0;
                break;        
                case "v1":
                    x = 1;
                break;        
                case "v2":
                    x = 2;
                break;        
                case "v3":
                    x = 3;
                break;        
                case "v4":
                    x = 4;
                break;        
                case "v5":
                    x = 5;
                break;
                case "v6":
                    y = 6;
                break;            
                case "v7":
                    x = 7;
                break;        
                case "v8":
                    x = 8;
                break;        
                case "v9":
                    x = 9;
                break;        
                case "v10":
                    x = 10;
                break;        
                case "v11":
                    x = 11;
                break;        
                case "v12":
                    x = 12;
                break;        
                case "v13":
                    x = 13;
                break;        
                case "v14":
                    x = 14;
                break;        
                case "v15":
                    x = 15;
                break;        
                }
                var y = 0;
                switch (cm[3])
		        {
		        case "v0":
                    y = 0;
                break;        
                case "v1":
                    y = 1;
                break;        
                case "v2":
                    y = 2; 
                break;        
                case "v3":
                    y = 3; 
                break;        
                case "v4":
                    y = 4; 
                break;        
                case "v5":
                    y = 5; 
                break;
                case "v6":
                    y = 6;
                break;            
                case "v7":
                    y = 7; 
                break;        
                case "v8":
                    y = 8; 
                break;        
                case "v9":
                    y = 9; 
                break;        
                case "v10":
                    y = 10; 
                break;        
                case "v11":
                    y = 11; 
                break;        
                case "v12":
                    y = 12; 
                break;        
                case "v13":
                    y = 13; 
                break;        
                case "v14":
                    y = 14; 
                break;        
                case "v15":
                    y = 15; 
                break;       
                }            
	    		r[pc] = 0x80 + x;
    			pc++;
	    		r[pc] = y * 16 + 4;
		    	pc++;
            }
            else
            {
                var x = 0;
                switch (cm[2])
		        {
		        case "v0":
                    x = 0;
                break;        
                case "v1":
                    x = 1;
                break;        
                case "v2":
                    x = 2; 
                break;        
                case "v3":
                    x = 3; 
                break;        
                case "v4":
                    x = 4; 
                break;        
                case "v5":
                    x = 5; 
                break;
                case "v6":
                    y = 6;
                break;            
                case "v7":
                    x = 7;
                break;        
                case "v8":
                    x = 8; 
                break;        
                case "v9":
                    x = 9; 
                break;        
                case "v10":
                    x = 10; 
                break;        
                case "v11":
                    x = 11; 
                break;        
                case "v12":
                    x = 12; 
                break;        
                case "v13":
                    x = 13; 
                break;        
                case "v14":
                    x = 14; 
                break;        
                case "v15":
                    x = 15; 
                break;        
                }
                r[pc] = 0x70 + x;
    			pc++;
	    		r[pc] = cm[3];
		    	pc++;
            }
		break;
		case "load":
			if (cm[2] == "I")
            {
                r[pc] = 0xA0 + Math.floor(cm[3] / 256);
		    	pc++;
                r[pc] = cm[3] % 256;
			    pc++;
            }
            else
            {
                var x = 0;
                switch (cm[2])
		        {
		        case "v0":
                    x = 0;
                break;        
                case "v1":
                    x = 1;
                break;        
                case "v2":
                    x = 2; 
                break;        
                case "v3":
                    x = 3; 
                break;        
                case "v4":
                    x = 4;
                break;        
                case "v5":
                    x = 5; 
                break;
                case "v6":
                    y = 6;
                break;           
                case "v7":
                    x = 7; 
                break;        
                case "v8":
                    x = 8; 
                break;        
                case "v9":
                    x = 9; 
                break;        
                case "v10":
                    x = 10; 
                break;        
                case "v11":
                    x = 11; 
                break;       
                case "v12":
                    x = 12; 
                break;        
                case "v13":
                    x = 13; 
                break;        
                case "v14":
                    x = 14; 
                break;        
                case "v15":
                    x = 15; 
                break;        
                }
               	r[pc] = 0x60 + x;
    			pc++;
	    		r[pc] = Number(cm[3]);
		    	pc++;
            }
		break;
        case "goto":
            r[pc] = 0x10;
  			pc++;
    		r[pc] = cm[2];
	    	pc++;   
        break;
        case "nsub":
            var x = 0;
            switch (cm[2])
		    {
		    case "v0":
                x = 0;
            break;
            case "v1":
                x = 1;
            break;        
            case "v2":
                x = 2;
            break;        
            case "v3":
                x = 3;
            break;        
            case "v4":
                x = 4;
            break;        
            case "v5":
                x = 5;
            break;
            case "v6":
                y = 6;
            break;            
            case "v7":
                x = 7;
            break;        
            case "v8":
                x = 8;
            break;        
            case "v9":
                x = 9; 
            break;        
            case "v10":
                x = 10;
            break;        
            case "v11":
                x = 11;
            break;        
            case "v12":
                x = 12;
            break;        
            case "v13":
                x = 13;
            break;        
            case "v14":
                x = 14;
            break;        
            case "v15":
                x = 15;
            break;        
            }
            var y = 0;
            switch (cm[3])
		    {
		    case "v0":
                y = 0;
            break;        
            case "v1":
                y = 1;
            break;        
            case "v2":
                y = 2;
            break;        
            case "v3":
                y = 3;
            break;        
            case "v4":
                y = 4;
            break;        
            case "v5":
                y = 5;
            break;
            case "v6":
                y = 6;
            break;            
            case "v7":
                y = 7;
            break;        
            case "v8":
                y = 8;
            break;        
            case "v9":
                y = 9;
            break;        
            case "v10":
                y = 10;
            break;        
            case "v11":
                y = 11;
            break;        
            case "v12":
                y = 12;
            break;        
            case "v13":
                y = 13;
            break;        
            case "v14":
                y = 14;
            break;        
            case "v15":
                y = 15;
            break;        
            }    
            r[pc] = 0x80 + x;
			pc++;
			r[pc] = y * 16 + 0x7;
            pc++;
		break; 
        case "eq":
            if (cm[3].indexOf("v") > -1)
            {
                var x = 0;
                switch (cm[2])
		        {
		        case "v0":
                    x = 0;
                break;        
                case "v1":
                    x = 1;
                break;        
                case "v2":
                    x = 2;
                break;        
                case "v3":
                    x = 3;
                break;        
                case "v4":
                    x = 4;
                break;        
                case "v5":
                    x = 5;
                break;
                case "v6":
                    y = 6;
                break;            
                case "v7":
                    x = 7;
                break;        
                case "v8":
                    x = 8;
                break;        
                case "v9":
                    x = 9;
                break;        
                case "v10":
                    x = 10;
                break;        
                case "v11":
                    x = 11;
                break;        
                case "v12":
                    x = 12;
                break;        
                case "v13":
                    x = 13;
                break;        
                case "v14":
                    x = 14;
                break;        
                case "v15":
                    x = 15;
                break;        
                }
                var y = 0;
                switch (cm[3])
		        {
		        case "v0":
                    y = 0;
                break;        
                case "v1":
                    y = 1;
                break;        
                case "v2":
                    y = 2; 
                break;        
                case "v3":
                    y = 3; 
                break;        
                case "v4":
                    y = 4; 
                break;        
                case "v5":
                    y = 5; 
                break;
                case "v6":
                    y = 6;
                break;            
                case "v7":
                    y = 7; 
                break;        
                case "v8":
                    y = 8; 
                break;        
                case "v9":
                    y = 9; 
                break;        
                case "v10":
                    y = 10; 
                break;        
                case "v11":
                    y = 11; 
                break;        
                case "v12":
                    y = 12; 
                break;        
                case "v13":
                    y = 13; 
                break;        
                case "v14":
                    y = 14; 
                break;        
                case "v15":
                    y = 15; 
                break;       
                }            
	    		r[pc] = 0x50 + x;
    			pc++;
	    		r[pc] = y * 16 + 0;
		    	pc++;
            }
            else
            {
                var x = 0;
                switch (cm[2])
		        {
		        case "v0":
                    x = 0;
                break;        
                case "v1":
                    x = 1;
                break;        
                case "v2":
                    x = 2; 
                break;        
                case "v3":
                    x = 3; 
                break;        
                case "v4":
                    x = 4; 
                break;        
                case "v5":
                    x = 5; 
                break;
                case "v6":
                    y = 6;
                break;            
                case "v7":
                    x = 7;
                break;        
                case "v8":
                    x = 8; 
                break;        
                case "v9":
                    x = 9; 
                break;        
                case "v10":
                    x = 10; 
                break;        
                case "v11":
                    x = 11; 
                break;        
                case "v12":
                    x = 12; 
                break;        
                case "v13":
                    x = 13; 
                break;        
                case "v14":
                    x = 14; 
                break;        
                case "v15":
                    x = 15; 
                break;        
                }
                r[pc] = 0x30 + x;
    			pc++;
	    		r[pc] = cm[3];
		    	pc++;
            }
		break;        
		}
	}
    for (var a in la) 
	{
        for (i = 0; i < pc; i++)
		{
			if (r[i] == a)
			{
                var c3 = la[a] + 512;
				r[i] = c3 % 256;
                r[i - 1] += Math.floor(c3 / 256);
			}
		}
	}
    var out0 = document.getElementById('out');
    for (i = 0; i < r.length; i += 2)
    {
        var m0 = r[i];
        var m1 = r[i + 1];
        var opcode = m0 << 8 | m1;
        var asm = decode(opcode);
        out0.value += (0x200 + i) + ":  " + asm + "\n";
    }
}
function decode(instr) {
    var x = (instr & 0x0F00) >> 8,
        y = (instr & 0x00F0) >> 4,
        kk = instr & 0x00FF,
        nnn = instr & 0x0FFF,
        n = instr & 0x000F;
    switch (instr & 0xF000)
    {
    case 0x0000:
        switch (instr)
        {
        case 0x00E0: 
            return "cls";
        case 0x00EE: 
            return "ret";
        case 0x00C6: 
            return "scroll";        
        case 0x0000: 
            return "nop";
        default:
            return "sys  " + nnn;
        }
    break;
    case 0x1000:
        return "goto  " + nnn;
    case 0x2000:
        return "call  " + nnn; 
    case 0x3000:
        return "eq  v" + x + "  " + kk; 
    case 0x4000:
        return "neq  v" + x + "  " + kk; 
    case 0x5000:
        return "eq  v" + x + "  v" + y; 
    case 0x6000:        
        return "load  v" + x + "  " + kk; 
    case 0x7000:
        return "add  v" + x + "  " + kk; 
    case 0x8000:
        switch (instr & 0x000F)
        {
        case 0x0000:
            return "load  v" + x + "  v" + y;  
        case 0x0001:
            return "or  v" + x + "  v" + y; 
        case 0x0002:
            return "and  v" + x + "  v" + y;  
        case 0x0003:
            return "xor  v" + x + "  v" + y;   
        case 0x0004: 
            return "add  v" + x + "  v" + y;  
        case 0x0005: 
            return "sub  v" + x + "  v" + y; 
        case 0x0006: 
            return "rshift  v" + x + "  v" + y; 
        case 0x0007: 
            return "nsub  v" + x + "  v" + y; 
        case 0x000E: 
            return "lshift  v" + x + "  v" + y; 
        }
    break;
    case 0x9000:
        return "neq  v" + x + "  v" + y; 
    case 0xA000:
        return "load  I  " + nnn; 
    case 0xB000:
        return "goto  v0  " + nnn; 
    case 0xC000:
        return "rand  v" + x + "  " + kk;
    case 0xD000:
        return "disp  v" + x + "  v" + y + "  " + n; 
    case 0xE000:
        switch (instr & 0x00FF)
        {
        case 0x009E: 
            return "keq  v" + x;  
        case 0x00A1:
            return "kneq  v" + x; 
        }
    break;
    case 0xF000:
        switch (instr & 0x00FF)
        {
        case 0x0007:
            return "load  v" + x + "  DT";
        case 0x000A: 
            return "load  v" + x + "  K"; 
        case 0x0015: 
            return "load  DT  v" + x; 
        case 0x0018: 
            return "load  ST  v" + x; 
        case 0x001E: 
            return "add  I  v" + x;
        case 0x0029: 
            return "load  F  v" + x; 
        case 0x0033: 
            return "load  B  v" + x; 
        case 0x0055: 
            return "load  I  v" + x;  
        case 0x0065: 
            return "load  v" + x + "  I"; 
        }
    break;
    }
};
        



```

#成果物

http://jsdo.it/ohisama1/otf9

以上。