Out of the box, the Atmel AVR Dragon has the following three header connectors mounted:
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SPI(ISP) Header - Used for SPI(ISP) programming and debugWIRE OCD.
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JTAG Header - Used for JTAG programming and JTAG OCD.
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VCC Header - Used for powering Devices placed in the prototype area, or to power external target boards (max. 300mA). Set to fixed 5V.
The following headers are not mounted:
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HV_PROG header
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EXPAND header
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40-pin DIP socket
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28-pin DIP socket