The Spectrum Digital XDS560v2-STM emulator has System Trace capability, along with a USB powered interface.

JTAG Emulator
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Product, Description, Price (US dollars)
Spectrum Digital XDS560v2 STM Traveler (p/n 702598), XDS560v2 STM emulator has System Trace capability along with a USB powered interface. Only required for C/C++/Assembler development, 1200
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