diff --git a/poc/avr_sdcard/Makefile b/poc/avr_sdcard/Makefile
index 3e96b97..ef1d310 100644
--- a/poc/avr_sdcard/Makefile
+++ b/poc/avr_sdcard/Makefile
@@ -182,7 +182,7 @@ AVRDUDE_PROGRAMMER = stk500v2
 
 # com1 = serial port. Use lpt1 to connect to parallel port.
 
-AVRDUDE_PORT = /dev/tty.PL2303-00001124
+AVRDUDE_PORT = /dev/tty.PL2303-00002126
 
 AVRDUDE_WRITE_FLASH = -U flash:w:$(TARGET).hex
 
diff --git a/poc/avr_sdcard/main.c b/poc/avr_sdcard/main.c
index d703b22..98809d6 100644
--- a/poc/avr_sdcard/main.c
+++ b/poc/avr_sdcard/main.c
@@ -42,7 +42,7 @@ extern FILE uart_stdout;
 //#define FILENAME	"sprite.raw" //ok
 //#define FILENAME	"ascii.smc"  //ok
 //#define FILENAME	"rom.smc"    //ok
-#define FILENAME	"supert.smc"
+//#define FILENAME	"supert.smc"
 //#define FILENAME	"vortex.smc"
 //#define FILENAME	"mrdo.smc"
 //#define FILENAME	"spacei.smc"
@@ -56,8 +56,10 @@ extern FILE uart_stdout;
 //#define FILENAME	"banklo.smc" //ok
 //#define FILENAME	"bankhi.smc" //ok
 //#define FILENAME	"vram2.smc"  //ok
+//#define FILENAME	"super02.smc"
+#define FILENAME	"crc.smc"
 
-#define ROMSIZE      4
+#define ROMSIZE      2
 #define DUMPNAME	"dump256.smc"
 #define BUFFER_SIZE 512
 #define BLOCKS 		(ROMSIZE << 8)
diff --git a/scripts/b.py b/scripts/b.py
index e176220..f02ed2a 100755
--- a/scripts/b.py
+++ b/scripts/b.py
@@ -18,8 +18,10 @@ for i in range(bits-1,-1,-1):
     else:
         sys.stdout.write("0")
     if i and not i%8:
-       sys.stdout.write(" ")
-		
+        sys.stdout.write(" ")
+
+        
+    
 print 
 print "0x%x"%  v
 print v
diff --git a/scripts/crc_xmodem.py b/scripts/crc_xmodem.py
index 6266e13..3e3ed73 100644
--- a/scripts/crc_xmodem.py
+++ b/scripts/crc_xmodem.py
@@ -34,6 +34,7 @@ def test_performance():
 
 def test_algo():
     data='david'
+    data='d'
     print "%x" % do_crc(data)
   
 
@@ -59,6 +60,7 @@ def main():
     #print result
 
 if __name__ == '__main__':
+    test_algo()
     main()