--- a/rvinterf/lowlevel/tfc139.c	Sat Dec 12 03:24:52 2015 +0000
+++ b/rvinterf/lowlevel/tfc139.c	Sat Dec 12 03:48:19 2015 +0000
@@ -140,20 +140,25 @@
 	fd_set fds;
 
 	baudrate_name = "57600";	/* what C139 firmware uses */
-	while ((c = getopt(argc, argv, "a:AB:l:s:w:")) != EOF)
+	while ((c = getopt(argc, argv, "a:AB:l:ms:w:")) != EOF)
 		switch (c) {
 		case 'a':
 			shellcode_load_addr = strtoul(optarg, 0, 16);
 			continue;
-		case 'A':
-			thumb_entry = 0;
-			continue;
 		case 'B':
 			baudrate_name = optarg;
 			continue;
 		case 'l':
 			logfname = optarg;
 			continue;
+		case 'm':
+			/* mimic mot931c.exe */
+			shellcode_load_addr = 0x800000;
+			stack_smash_addr = 0x837C54;
+			/* FALL THRU */
+		case 'A':
+			thumb_entry = 0;
+			continue;
 		case 's':
 			stack_smash_addr = strtoul(optarg, 0, 16);
 			continue;