In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote: Kramer, sorry, this is not correct - the SX-Blitz does not have an on-board clock generator. In most cases, a resonator or crystal attached to the SX OSC1 and OSC2 pins may be in place while the device is programmed by the SX-Blitz. This is also true for the SX-Key as long as you use it for programming only but debugging only works with the clock device removed, or at least disconnected from the OSC1 pin. When using an external clock generator with its output attached to the OSC1 pin, it must be removed before programming and/or debugging in most cases, as it adds too much load, and may be damaged by the 12V programming voltage fed into the OSC1 pin by the SX-Blitz/Key. John, The SX-Blitz USB is actually powered from two sides: The on-board FT232R USB-serial adapter chip is powered from the USB port, where the on-board SX20 is powered from the target device. IOW - as long as you only connect the SX-Blitz to the USB port, the FT232R gets power, and is detected by the virtual com port driver, and Windows makes available a new COM port (COM 5 in your case), and the IDE can detect it. When the SX-Blitz gets hot while connected to the target system (I assume it is the SX20 that gets hot in this case) unfortunately indicates that the poor SX20 is fried. When you press PROGRAM, the SX-Key IDE tries to establish a communication link to the SX-Blitz which fails because the SX20 does not answer. This is why the IDE reports COM5 can't be found, or does the message actually say "SX-Blitz not found on COM5"? I'm sorry for giving you such bad news but it seems to me that something severe happened which fried the SX28 you were using on the PDB, but also the SX-Blitz. ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=248532#m248726 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)