let len = 560*448
let pcnt = (sys.maxmem() / len)|0
if (pcnt < 2) {
  printerrln("Not enought RAM on the system to test!")
  return
}
let c = 0
print("Rendering plane ")
for (c = 0; c < pcnt; c++) {
  print(`${c} `)
  for (let i = 0; i < len; i++) {
    sys.poke(c*len + i, c * ((256/pcnt)|0) + 1)
  }
}
println("Let's see how fast DMA really is!")
c = 0
while (1) {
  dma.ramToFrame(len * c, 0, len)
  c = (c + 1) % pcnt
}