OK Don, I'll take your word for it. But if I use the Tx/Rx pins on the 89C52 is that the same as hooking on Pin 2 & 3 of the 20pin guys??? And how about the SCL/SDA. Are PD5/PD6 equivilent on the 89C2051?? John Mullan -----Original Message----- From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Don McKenzie Sent: Thursday, December 09, 1999 5:53 PM To: PICLIST@MITVMA.MIT.EDU Subject: Re: Stamp like software for AT89C52??? SShhhhhh!!! Don't tell any one, but it will work on the whole 8051 family. I can verify that this is 100% OK if you wish. has been a hold up with baud rates and crystal values, but it looks like 2400/9600 supported using an 11.0592Mhz crystal. Mind you, the max clock is 24mhz for the 4051, but we have to get started with it, so we will re-visit the speed problem later. Don McKenzie mailto:don@dontronics.com http://www.dontronics.com World's Largest Range of Atmel and PICmicro Hardware and Software StampStick 32K EEPROM Basic http://www.dontronics.com/tiny51.html