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

assets/disk0/dmatest2.js

@@ -0,0 +1,20 @@
+con.clear()
+com.sendMessage(0, 'CLOSE')
+com.sendMessage(0, 'OPENR"fox.bytes"')
+let status = com.getStatusCode(0)
+if (0 == status) {
+  println("DMA reading from disk...")
+  let t1 = sys.nanoTime()
+  dma.comToRam(0, 0, 0, 560 * 448)
+  let t2 = sys.nanoTime()
+  println("DMA copying to the framebuffer...")
+  let t3 = sys.nanoTime()
+  dma.ramToFrame(0, 0, 560 * 448)
+  let t4 = sys.nanoTime()
+
+  println(`DMA disk-to-RAM time: ${(t2 - t1) / 1000000} ms`)
+  println(`DMA RAM-to-fbuf time: ${(t4 - t3) / 1000000} ms`)
+}
+else {
+  printerrln(`File 'fox.bytes' not found on the root of the disk: ${status}`)
+}