diff --git a/jtag/src/cmd/dr.c b/jtag/src/cmd/dr.c
index 077d1736..6dfa18f0 100644
--- a/jtag/src/cmd/dr.c
+++ b/jtag/src/cmd/dr.c
@@ -54,15 +54,6 @@ cmd_dr_run( char *params[] )
 		return 1;
 	}
 
-	if (params[1]) {
-		if (strcasecmp( params[1], "in" ) == 0)
-			dir = 0;
-		else if (strcasecmp( params[1], "out" ) == 0)
-			dir = 1;
-		else
-			return -1;
-	}
-
 	if (chain->parts->parts[chain->active_part]->active_instruction == NULL) {
 		printf( _("%s: part without active instruction\n"), "dr" );
 		return 1;
@@ -72,6 +63,30 @@ cmd_dr_run( char *params[] )
 		return 1;
 	}
 
+	if (params[1]) {
+		if (strcmp( params[1], "in" ) == 0)
+			dir = 0;
+		else if (strcmp( params[1], "out" ) == 0)
+			dir = 1;
+		else {
+			unsigned int bit;
+			if (strspn(params[1], "01") != strlen(params[1])) {
+				return -1;
+			}
+			
+			r = chain->parts->parts[chain->active_part]->active_instruction->data_register->in;
+			if (r->len != strlen(params[1])) {
+				printf( _("%s: register length mismatch\n"), "dr" );
+				return 1;
+			}
+			for (bit = 0; params[1][bit]; bit++) {
+				r->data[r->len - 1 - bit] = (params[1][bit] == '1');
+			}
+			
+			dir = 0;
+		}
+	}
+
 	if (dir)
 		r = chain->parts->parts[chain->active_part]->active_instruction->data_register->out;
 	else