Hi Parviz

I received today an interesting DOS program from AEC Electronics Limited.
The program is dedicated to AT89S51 / 52 /8252 programming.
His name is aec_isp_v3 ( a zip archive) and is free for noncommercial applications.
It is full configurable.
The LPT dongle schema is fitted inside the program’s menu.
I suggest to use some 74hc125 buffers for safety ( or 74hc244)
I tested it and it works.
I gave up to write such a program as I intended considering this one is good enough and
89s52 will be faze out soon
You can ask for the program to :
http://www.aec-electronics.co.nz/software.htm

It will be sent by mail to you.

Cristian Ceausescu