M include/mgba/internal/gba/hardware.h → include/mgba/internal/gba/hardware.h

@@ -71,6 +71,8 @@ DECL_BITS(RTCCommandData, Command, 4, 3);
 DECL_BIT(RTCCommandData, Reading, 7);
 
 DECL_BITFIELD(RTCStatus2, uint8_t);
+DECL_BITS(RTCStatus2, INT1, 0, 4);
+DECL_BIT(RTCStatus2, INT2, 6);
 
 #pragma pack(push, 1)
 struct GBARTC {

M src/gba/hardware.c → src/gba/hardware.c

@@ -224,6 +224,10 @@ _rtcUpdateClock(rtc, source);
 				break;
 			case RTC_FORCE_IRQ:
 				break;
+			case RTC_ALARM1:
+				if (RTCStatus2GetINT1(rtc->status2) == 4) {
+					rtc->bytesRemaining = 3;
+				}
 			}
 		} else {
 			mLOG(GBA_HW, WARN, "Invalid RTC command byte: %02X", rtc->bits);