We have tried to modify the C84 serial programmer from AN589 for use with 16C74 (Our ambition is to make a cheap universal PIC-programmer for our students) We have only been able to program a 16C71 with our system but not the 16C74. Does anyone have any experience with this. Halvor Austene Avdelingsredsleder Avdeling for realfag og ingenixrutdanning Hxgskolen i Vestfold Pb. 2243, 3103 Txnsberg Tlf: +47 33031152 (direkte) Tlf. +47 33031000 (sentralbord) Fax: +47 3301103