概要
jsdoでchip8やってみた。
アセンブラ作ってみた。
写真
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 + 2;
}
switch (cm[1])
{
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;
}
//alert(x);
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;
}
}
for (var a in la)
{
for (i = 0; i < pc; i++)
{
if (r[i] == a)
{
c3 = la[a] - i - 4;
r[i] = c3;
}
}
}
var b = _arrayBufferToBase64(r);
var url1 = tob(b);
var a = document.createElement('a');
a.download = "test.rom";
a.href = url1;
a.textContent = "Download rom";
document.getElementById('out').appendChild(a);
}
成果物
以上。