Since telnet is not installed by default from Windows Vista and later, it's better to use putty in command line.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1434 bbd45198-f89e-11dd-88c7-29a3b14d5316

tools/run-mini2440-net-sdcard.bat

@@ -1,2 +1,2 @@
 start qemu-system-arm.exe -M mini2440 -kernel ..\bsp\mini2440\rtthread-mini2440.axf -show-cursor -serial telnet:127.0.0.1:1200,server -net nic -net tap,ifname=virtual -sd SDCARD -serial file:virtualkbd
-telnet 127.0.0.1 1200
+start putty.exe telnet://127.0.0.1:1200/

tools/run-mini2440-sdcard.bat

@@ -1,3 +1,3 @@
 start qemu-system-arm.exe -M mini2440 -kernel ..\bsp\mini2440\rtthread-mini2440.axf -show-cursor -sd SDCARD -serial telnet:127.0.0.1:1200,server -serial file:virtualkbd
-telnet 127.0.0.1 1200
+start putty.exe telnet://127.0.0.1:1200/