apple1-videocard-lib/hexdump.js
2021-11-28 16:13:55 +01:00

33 lines
666 B
JavaScript

const fs = require('fs');
let prg = fs.readFileSync("test_apple1.prg");
prg = prg.slice(2); // skip header
let s = appledump(prg, 0x4000);
console.log(s);
function appledump(bytes, start) {
let rows=16;
let s="\r\n";
for(let r=0;r<bytes.length;r+=rows) {
s+= hex(r+start, 4) + ": ";
for(let c=0;c<rows;c++) {
let index = r+c;
if(index < bytes.length) {
const byte = bytes[r+c];
s+= hex(byte)+" ";
}
}
s+="\n";
}
return s;
}
function hex(value, size) {
if(size === undefined) size = 2;
let s = "0000" + value.toString(16);
return s.substr(s.length - size);
}