dma testing codes ('fox.bytes' comes from the assets dir)

assets/disk0/dmatest.js

@@ -0,0 +1,20 @@
+let len = 560*448
+let pcnt = (system.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
+}