hola gabriel no se si recibiste el mensaje que te puse a tu cuenta 

                                        saludos julio

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De:             Calvin[SMTP:tgo@CHIH1.TELMEX.NET.MX]
Enviado:        Miˇrcoles 11 de Febrero de 1998 8:16 AM
Para:           PICLIST@MITVMA.MIT.EDU
Asunto:         16C6X inputs

Does anyone know the input protection of the 16c6x series pics?
I know the c5x series have 2 clamping diodes on each input (but MCLR, this
only has one), but I have not been able to find any info for the midrange
PICs. I have checked the Data Sheets to no avail... :(

TIA

Gabriel Gonzalez
TGO Electronics