Even $asc($chr(44)) works grin

Just as a tool (hex and decimal count):
Code:
alias chrt {
  var %i = 0
  window -ln @chrt 0 0 100 500
  clear @chrt
  while (%i <= 255) {
    aline @chrt $+(14,$base(%i,10,16,2),10,$base(%i,10,10,4), $chr(%i))
    inc %i
  }
  window -r @chrt
}