diff --git a/src/mess/machine/upd765.c b/src/mess/machine/upd765.c
index 1d53c4cfe03..2d5302f46d6 100644
--- a/src/mess/machine/upd765.c
+++ b/src/mess/machine/upd765.c
@@ -971,6 +971,9 @@ int upd765_family_device::check_command()
 	case 0x0d:
 		return command_pos == 6 ? C_FORMAT_TRACK       : C_INCOMPLETE;
 
+	case 0x0e:
+		return command_pos == 2 ? C_DUMP_REG           : C_INCOMPLETE;
+
 	case 0x0f:
 		return command_pos == 3 ? C_SEEK               : C_INCOMPLETE;
 
@@ -1001,9 +1004,26 @@ void upd765_family_device::start_command(int cmd)
 				 command[1], command[2], command[3]);
 		// byte 1 is ignored, byte 3 is precompensation-related
 		fifocfg = command[2];
+		precomp = command[3];
 		main_phase = PHASE_CMD;
 		break;
 
+	case C_DUMP_REG:
+		main_phase = PHASE_RESULT;
+		result[0] = flopi[0].pcn;
+		result[1] = flopi[1].pcn;
+		result[2] = flopi[2].pcn;
+		result[3] = flopi[3].pcn;
+		result[4] = (spec & 0xff00) >> 8;
+		result[5] = (spec & 0x00ff);
+		result[6] = sector_size;
+		result[7] = locked ? 0x80 : 0x00;
+		result[7] |= (perpmode & 0x30);
+		result[8] = fifocfg;
+		result[9] = precomp;
+		result_pos = 10;
+		break;
+
 	case C_FORMAT_TRACK:
 		format_track_start(flopi[command[1] & 3]);
 		break;
@@ -1018,6 +1038,7 @@ void upd765_family_device::start_command(int cmd)
 
 	case C_PERPENDICULAR:
 		logerror("%s: command perpendicular\n", tag());
+		perpmode = command[1];
 		main_phase = PHASE_CMD;
 		break;
 
diff --git a/src/mess/machine/upd765.h b/src/mess/machine/upd765.h
index d7e9b34bbff..e8dca14500d 100644
--- a/src/mess/machine/upd765.h
+++ b/src/mess/machine/upd765.h
@@ -292,6 +292,7 @@ protected:
 	UINT8 dor, dsr, msr, fifo[16], command[16], result[16];
 	UINT8 st0, st1, st2, st3;
 	UINT8 fifocfg, dor_reset;
+	UINT8 precomp, perpmode;
 	UINT16 spec;
 	int sector_size;
 	int cur_rate;
@@ -303,6 +304,7 @@ protected:
 
 	enum {
 		C_CONFIGURE,
+		C_DUMP_REG,
 		C_FORMAT_TRACK,
 		C_LOCK,
 		C_PERPENDICULAR,