diff --git a/include/mgba/internal/gba/io.h b/include/mgba/internal/gba/io.h
index 9875061f3..bdeafdcd3 100644
--- a/include/mgba/internal/gba/io.h
+++ b/include/mgba/internal/gba/io.h
@@ -157,6 +157,7 @@ enum GBAIORegisters {
 	REG_DEBUG_STRING = 0xFFF600,
 	REG_DEBUG_FLAGS = 0xFFF700,
 	REG_DEBUG_ENABLE = 0xFFF780,
+	REG_DEBUG_CYCLES = 0xFFF800,
 };
 
 mLOG_DECLARE_CATEGORY(GBA_IO);
diff --git a/src/gba/io.c b/src/gba/io.c
index cc39e1192..d34dcb4b4 100644
--- a/src/gba/io.c
+++ b/src/gba/io.c
@@ -573,6 +573,11 @@ void GBAIOWrite(struct GBA* gba, uint32_t address, uint16_t value) {
 	case REG_DEBUG_ENABLE:
 		gba->debug = value == 0xC0DE;
 		return;
+	case REG_DEBUG_CYCLES: {
+		int32_t number_of_cycles = mTimingCurrentTime(&gba->timing);
+		mLOG(GBA_DEBUG, INFO, "Cycles: %d Tag: %d", number_of_cycles, value);
+		return;
+	}
 	case REG_DEBUG_FLAGS:
 		if (gba->debug) {
 			GBADebug(gba, value);
@@ -936,6 +941,11 @@ uint16_t GBAIORead(struct GBA* gba, uint32_t address) {
 			return 0x1DEA;
 		}
 		// Fall through
+	case REG_DEBUG_CYCLES: {
+		int32_t number_of_cycles = mTimingCurrentTime(&gba->timing);
+		mLOG(GBA_DEBUG, INFO, "Cycles: %d", number_of_cycles);
+		return number_of_cycles;
+	}
 	default:
 		mLOG(GBA_IO, GAME_ERROR, "Read from unused I/O register: %03X", address);
 		return GBALoadBad(gba->cpu);