STM32Fx PCB with STM32F100RBT6 mounted. This device features:
Cortex M3 Core
128K Flash
8K SRAM
NOTE: An external programmer is suggested for this target, the recommended one is the ST-LINK/V2 (available for < $25). The wiki page contains examples of using other programmers via OpenOCD. ChipWhisperer release 3.4.4 and later support programming this using the built-in bootloader.