Speccy Memory Y-coordinates

zxspec-y.js

// Speccy memory addresses for y-coords on screen (first byte) 

let list = [], third, midblock, fine, i;

for (i=0;i<192;i++) {
  third =  i&192 ;
  midblock = (i&56)>>3 ;
  fine = (i&7)<<3 ;
  list.push(midblock+third+fine)
}

document.body.innerHTML += list.join();