Note the missing SPI1 on the new revision of the Windows IoT pinouts for Raspberry Pi
It seems the SPI1 (pins11,35,38,40/GPIO 19,20,21,17) have been assigned to GPIO on the latest pin out.
Apparently there are five alternatives for the use of the pins, see:http://elinux.org/RPi_BCM2835_GPIOs
Only two SPI devices seems quite constrained when I’m used to .NET Microframework on the Netduino where such constraints are not present.
Next the sample push button application has been updated from using polling to using interrupts, get the feeling that the sand is moving under my feet with Windows IoT.