In case the developer of vDosxy3 is listening: an apparent keyboard anomaly. When working in full-screen mode, alpha-numeric keyssuddenly stop responding, producing instead what looks like a forward tab.The way out of it is going to windowed mode, invoking the xy3 memory menu and clearing it with Esc. Then keyboard function is returned.For whatever reason, the memory menu routine seems to clear other freezes/keyboard anomalies as well.