Вот Release Notes:
SP4 includes all SP1, SP2, and SP3 updates
See the release history in the AVR Studio online user guide for information about previous releases.
* Features
- Software, Firmware, User Guide, and part support updates for AVR Dragon. See the AVR Dragon user guide for more details.
- Firmware update for the JTAGICE MKII. See the JTAGICE MKII user guide for more details.
- Firmware update for the STK500. See the STK500 user guide for more details.
* New part support
- ATmega644P (AVRISP,STK500,JTAGICE MKII,SIMULATOR,AVRASM2,ICE50)
- ATmega329P (AVRISP,AVRISP MKII,STK500,JTAGICE MKII,AVR DRAGON,SIMULATOR,AVRASM2,ICE50)
- ATmega3290P (AVRISP,AVRISP MKII,STK500,JTAGICE MKII,AVR DRAGON,SIMULATOR,AVRASM2,ICE50)
- ATmega325P (AVRISP,AVRISP MKII,STK500,JTAGICE MKII,AVR DRAGON,SIMULATOR,AVRASM2,ICE50)
- ATmega3250P (AVRISP,AVRISP MKII,STK500,JTAGICE MKII,AVR DRAGON,SIMULATOR,AVRASM2,ICE50)
* Fixes
- General bug fixes for simulator, assembler, JTAGICEmkII
* Note
- Windows 95 is not supported by AVR Studio 4 SP3 and SP4
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http://atmel.com/dyn/resources/prod_docume...o412SP4b497.exe