Found time to build the 7405 interface today.
Googling around the subject beforehand, came across this
http://oocities.com/microappnotes/UARTAVR.htm

It was mirrored from Geocities in october 2009.

text only
http://web.archive.org/web/200806240....com/microappn
otes/UARTAVR.htm
note
www.nutsvolts.com not www.ntsvolts.com

other ref maybe (not read yet)
Programming The 54¢ Micro
by G. Y. Xu
Microcontroller/PIC 2006-02 (Program files and code listing)
http://www.nutsvolts.com/media-files...A2%20MICRO.zip