--- a/simtool/grcard2.c	Sun Feb 07 02:40:28 2021 +0000
+++ b/simtool/grcard2.c	Sun Feb 07 02:47:51 2021 +0000
@@ -113,3 +113,28 @@
 	}
 	return(0);
 }
+
+cmd_grcard2_set_super(argc, argv)
+	char **argv;
+{
+	u_char cmd[13];
+	int rc;
+
+	/* Grcard2 proprietary command APDU */
+	cmd[0] = 0xA0;
+	cmd[1] = 0xD4;
+	cmd[2] = 0x3A;
+	cmd[3] = 0x0B;
+	cmd[4] = 8;
+	rc = encode_pin_entry(argv[1], cmd + 5);
+	if (rc < 0)
+		return(rc);
+	rc = apdu_exchange(cmd, 13);
+	if (rc < 0)
+		return(rc);
+	if (sim_resp_sw != 0x9000) {
+		fprintf(stderr, "bad SW response: %04X\n", sim_resp_sw);
+		return(-1);
+	}
+	return(0);
+}