add bin2prg tool

tools/bin2prg.js

@@ -0,0 +1,26 @@
+const fs = require('fs');
+const parseOptions = require("./parseOptions");
+
+const options = parseOptions([
+   { name: 'input', alias: 'i', type: String },
+   { name: 'output', alias: 'o', type: String },
+   { name: 'start', alias: 's', type: String }
+]);
+
+if(options.input === undefined || options.output === undefined || options.start === undefined) {
+   console.log("usage: bin2prg -i inputfile.prg -o outputfile.bin -s hexaddress");
+   process.exit(-1);
+}
+
+let bin = fs.readFileSync(options.input);
+
+let start_address = parseInt(options.start, 16);
+let lo = (start_address >> 0) & 0xFF;
+let hi = (start_address >> 8) & 0xFF;
+
+let prg = new Uint8Array([ lo, hi, ...bin ]);
+
+fs.writeFileSync(options.output, prg);
+
+console.log(`${options.output} written`);
+