diff --git a/Components/1770/1770.cpp b/Components/1770/1770.cpp
index 272d7b4d0..d8c21c4e3 100644
--- a/Components/1770/1770.cpp
+++ b/Components/1770/1770.cpp
@@ -23,10 +23,16 @@ void WD1770::set_register(int address, uint8_t value) {
 	switch(address&3) {
 		case 0: {
 			if((value&0xf0) == 0xd0) {
-				printf("!!!TODO: force interrupt!!!\n");
-				update_status([] (Status &status) {
-					status.type = Status::One;
-				});
+				if(value == 0xd0) {
+					// Force interrupt **immediately**.
+					printf("Force interrupt immediately\n");
+					posit_event(static_cast<int>(Event1770::ForceInterrupt));
+				} else {
+					printf("!!!TODO: force interrupt!!!\n");
+					update_status([] (Status &status) {
+						status.type = Status::One;
+					});
+				}
 			} else {
 				command_ = value;
 				posit_event(static_cast<int>(Event1770::Command));
@@ -169,13 +175,22 @@ void WD1770::posit_event(int new_event_type) {
 		}
 	}
 
-	if(!(interesting_event_mask_ & static_cast<int>(new_event_type))) return;
-	interesting_event_mask_ &= ~new_event_type;
+	if(new_event_type == static_cast<int>(Event1770::ForceInterrupt)) {
+		interesting_event_mask_ = 0;
+		resume_point_ = 0;
+		update_status([] (Status &status) {
+			status.type = Status::One;
+		});
+	} else {
+		if(!(interesting_event_mask_ & static_cast<int>(new_event_type))) return;
+		interesting_event_mask_ &= ~new_event_type;
+	}
 
 	Status new_status;
 	BEGIN_SECTION()
 
 	// Wait for a new command, branch to the appropriate handler.
+	case 0:
 	wait_for_command:
 		printf("Idle...\n");
 		set_data_mode(DataMode::Scanning);
diff --git a/Components/1770/1770.hpp b/Components/1770/1770.hpp
index aa15a5259..52d544824 100644
--- a/Components/1770/1770.hpp
+++ b/Components/1770/1770.hpp
@@ -116,7 +116,8 @@ class WD1770: public Storage::Disk::MFMController {
 			Command			= (1 << 3),	// Indicates receipt of a new command.
 			HeadLoad		= (1 << 4),	// Indicates the head has been loaded (1973 only).
 			Timer			= (1 << 5),	// Indicates that the delay_time_-powered timer has timed out.
-			IndexHoleTarget	= (1 << 6)	// Indicates that index_hole_count_ has reached index_hole_count_target_.
+			IndexHoleTarget	= (1 << 6),	// Indicates that index_hole_count_ has reached index_hole_count_target_.
+			ForceInterrupt	= (1 << 7)	// Indicates a forced interrupt.
 		};
 		void posit_event(int type);
 		int interesting_event_mask_;