Hello, i've noted that the windowed (JW) parts don't have any speed specification. That means that they run at full speed (20 MHz for a 16C74, 10 Mhz for a 16F84, and so on)??? Thanks in advance to all, Adolfo. ----------------------------------------------------------------------- | Adolfo Cobo Garcia - UNIVERSIDAD DE CANTABRIA | | E.T.S.I.I. y Telecomunicacion, Grupo de Ingenieria Fotonica | | Avda. Los Castros s/n E-39005 Santander SPAIN | | Tfno. +34-42-201539 Fax +34-42-201873 Email: acobo@teisa.unican.es | -----------------------------------------------------------------------