function db(func) {
    let lines = [];
    for (let i = 0; i < 256; i += 16) {
        let items = [];
        for (let j = 0; j < 16; j++) {
            let x = i + j;
            items.push(func(x));
        }
        lines.push('    .byte ' + items.join(', '));
    }
    return lines.join('\n');
}

console.log(
`.segment "TABLES"

.export mul_lobyte256
.export mul_hibyte256
.export mul_hibyte512

.align 256
mul_lobyte256:
${db((x) => Math.round(x * x / 2) & 0xff)}

.align 256
mul_hibyte256:
${db((x) => (Math.round(x * x / 2) >> 8) & 0xff)}

.align 256
mul_hibyte512:
${db((x) => (Math.round((x + 256) * (x + 256) / 2) >> 8) & 0xff)}

`);