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
+}

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}`)
+}