Thank you - of course you are correct - please understand the upset and confusion this Rev ''Y'' has caused. Contributing to my confusion was the earlier ''hint'' in which we IAR 5.20 users were encouraged to ''exchange'' non-Rev ''Y'' devices in their EVAL Kits. So I may not be ''alone'' in my Rev ''Y'' ineptness. (I must tell you that Avnet and my local ST Sales Office ''both'' have assured me that my EVAL-E board(S) will include Rev ''Y'') Many do hope you will address Rev ''Y'' in your pending ''Rev Compatibility'' posting. (this rev issue must be a special nightmare for ST - it has caused great upset to my firm/clients)