some tidying up

xorscroll.hw

@@ -0,0 +1,10 @@
+import "uw8.ram" memory(2);
+import "uw8.time" global mut time: i32;
+
+export fn tic() {
+  let i: i32;
+  loop frame {
+    i?120 = (i % 320 + time / 10) ^ (i / 320);
+    branch_if (i := i + 1) < 320*256: frame;
+  }
+}