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diff --git a/src/event.h b/src/event.h
new file mode 100644
index 0000000..35f8446
--- /dev/null
+++ b/src/event.h
@@ -0,0 +1,28 @@
+//
+// EVENT.H: System timing support functionality
+//
+// by James L. Hammons
+//
+
+#ifndef __EVENT_H__
+#define __EVENT_H__
+
+#include "types.h"
+
+// Note that these are NTSC timings:
+
+#define RISC_CYCLE_IN_USEC     0.03760684198
+#define M68K_CYCLE_IN_USEC     (RISC_CYCLE_IN_USEC * 2)
+#define HORIZ_PERIOD_IN_USEC   63.5555
+
+#define USEC_TO_RISC_CYCLES(u) (uint32)(((u) / RISC_CYCLE_IN_USEC) + 0.5)
+#define USEC_TO_M68K_CYCLES(u) (uint32)(((u) / M68K_CYCLE_IN_USEC) + 0.5)
+
+void InitializeEventList(void);
+void SetCallbackTime(void (* callback)(void), double time);
+void RemoveCallback(void (* callback)(void));
+void AdjustCallbackTime(void (* callback)(void), double time);
+double GetTimeToNextEvent(void);
+void HandleNextEvent(void);
+
+#endif	// __EVENT_H__