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Table of Contents
STM32duino
The STM32duino board is based on the ARM Cortex M3 like the Arduino Duo. The version I use is the Blus Pill I bought on E-Bay.
USB Fix
Unfortunately the board comes with a 10k pullup resistor from D+ to 3.3V (in the schematic it's a 4.7k resistor to ground). That can cause problems on some PCs. Just take the R10 out and with an 1.5k resistor like shown here: http://wiki.stm32duino.com/index.php?title=Blue_Pill#Hardware_installation
Schematic
Here one find the schematic and the manufacturer data.
Specification
Model: STM32F103C8T6 Core: ARM 32 Cortex-M3 CPU Debug mode: SWD 72MHz work frequency 64K flash memory, 20K SRAM 2.0-3.6V power, I/O Reset(POR/PDR) 8MHz crystal