With PBasic Pro you define the oscillator speed with a DEFINE statement DEFINE OSC 20 All caps required. I'm not sure about the PBasic version. Dan -----Original Message----- From: Marko Palikko To: PICLIST@MITVMA.MIT.EDU Date: Wednesday, September 01, 1999 6:58 AM Subject: RS232 Timing >Hello All, >This is a beginners question. > >I'm trying to program serial ( RS232) communication on a Microchip 16F84 >( 10 MHz ). > >I'm using PBasic and using the SERIN & SEROUT commands. I was wondering >if the PBasic SERIN & SEROUT Commands assume that the PIC is running at >4MHz and that is why I'm having trouble receiving the correct data from >the PIC. > >thanks, > >Marko Palikko >marko@comtecheservices.com