*Simulator* for upcoming Minecraft 8-bit CPU

8S1A-Node.js

function C8S1A(outHandler) {
	var c = {};
	c.out = outHandler;
	c.cache = new Array(256);
	c.exec = function(f, argv) {
		if (typeof this[f] != "function") {this.out("Invalid instruction " + typeof this[f]); return;}
		var nv = new Array();
		var iter = 0;
		var skip = -1;
		//console.log(argv);
		for (var arg in argv) {
			if (arg != skip) {
				if (argv[parseInt(arg)] == 255) {
					nv[iter] = this.cache[argv[parseInt(arg)+1]];
					//console.log(this.cache[argv[parseInt(arg)+1]]);
					//console.log(argv[parseInt(arg)+1]);
					//console.log(parseInt(arg) + 1);
					skip = parseInt(arg) + 1;
				} else {
					nv[iter] = argv[parseInt(arg)];
				}
				iter++;
			}
		}
		//console.log(nv);
		this[f](nv);
	}
	c[0] = function(argv) {this.cache[0] = argv[0] + argv[1];}
	c[1] = function(argv) {this.cache[0] = argv[0] - argv[1];}
	c[2] = function(argv) {this.cache[argv[0]] = argv[1];}
	c[3] = function(argv) {if (argv[0] == argv[1]) this.exec(argv[2], argv.slice(3));}
	c[4] = function(argv) {if (argv[0] != argv[1]) this.exec(argv[2], argv.slice(3));}
	c[5] = function(argv) {if (argv[0] > argv[1]) this.exec(argv[2], argv.slice(3));}
	c[6] = function(argv) {if (argv[0] < argv[1]) this.exec(argv[2], argv.slice(3));}
	c[7] = function(argv) {this.out(argv[0]);}
	c.args = [2, 2, 2, -2, -2, -2, -2, 1];
	return c;
}

var fs = require("fs");
var stdin = process.openStdin();
var ascii = false;
var cpu = new C8S1A(function(t) {if (ascii && typeof t == "number") console.log(String.fromCharCode(t)); else console.log(t.toString());});
stdin.addListener("data", function(d) {
	var data = d.toString().trim();
	if (data == "q") process.exit();
	if (data == "m") {
		ascii = !ascii; 
		console.log("Switched mode to " + (ascii ? "ascii" : "number")); 
		process.stdout.write("8S1A Input> "); 
		return;
	}
	if (data == "h") {
		console.log("List of commands:\ne\t\tExecute text file (*.8s1)\neb\t\tExecute binary file (*.8b1)\nh\t\tDisplay this help\nhi\t\tDisplay instructions\nm\t\tToggle display of numbers between ascii and number\nq\t\tQuit"); 
		process.stdout.write("8S1A Input> "); 
		return;
	}
	if (data == "hi") {
		console.log("List of instructions:\n0x00 <addend1> <addend2>\t\tAdd addend1 and addend2\n0x01 <first> <second>\t\t\tSubtract second from first\n0x02 <position> <value>\t\t\tSet position to value\n0x03 <num1> <num2> <instructions...>\tRun instructions if num1 equals num2\n0x04 <num1> <num2> <instructions...>\tRun instructions if num1 does not equal num2\n0x05 <num1> <num2> <instructions...>\tRun instructions if num1 is greater than num2\n0x06 <num1> <num2> <instructions...>\tRun instructions if num1 is less than num2\n0x07 <number>\t\t\t\tPrint number as character or number depending on mode\nVariables can be used by replacing the number with 0xFF + memory position"); 
		process.stdout.write("8S1A Input> "); 
		return;
	}
	if (data.startsWith("e")) {
		var argv = data.split(" ");
		var file;
		if (data.startsWith("eb")) {
			file = fs.readFileSync(argv[1]);
			var ex = -1;
			var args = new Array();
			for (var i = 0; i < file.length; i++) {
				if (file[i] == 0xFE) {
					cpu.exec(ex, args);
					ex = -1;
					args = new Array();
				} else {
					if (ex == -1) ex = file[i];
					else args.push(file[i]);
				}
			}
			if (ex != -1) cpu.exec(ex, args);
		} else {
			file = fs.readFileSync(argv[1], 'utf8');
			var sp = file.split("\n");
			for (var s in sp) {
				var insts = sp[s].split(" ");
				for (var i in insts) insts[i] = parseInt(insts[i]);
				cpu.exec(insts[0], insts.slice(1));
			}
		}
		process.stdout.write("8S1A Input> ");
		return;
	}
	var insts = data.trim().split(" ");
	cpu.exec(insts[0], insts.slice(1));
	process.stdout.write("8S1A Input> ");
	//document.getElementById("input").value = "";
	return;
});
process.stdout.write("8S1A Input> ");