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First time I learn the MCS51 series microcontroller, I made a board like 8031-AH version. That was a maximum system types. The chip programmed once with a monitor program like paulmon. Using a programmer type like EasyDownloader v2.2s is very-very nice. Then when I make another kind of circuitry, using a minimum types design, the overload then rise up by put and remove the chip to programmed. The mesh is very frustrating. Could you imagine to get the perfect firmware (as my imagine) you must done the same things a few times, boring! Wasting time and the pin chip may also worn out too! Now this is another kind of design but use a minimum system types using Atmel MCS51 S-series with ISP programming. So with this kind of board, the chip do not need to remove just programmed on board. Programed using ISP programming could be done directly through LPT parallel port. There are many programming software could be found on the internet. Some that I could find and much realiable eq.: AEC-ISP programmer, this kind is DOS version. Could be download at : AEC-Electronics. Also ISP programmer made by Asim Khan, could be download at : Asim Khan’s ISP software, this kind is a windows version. Besides that there is software from Adam Dybkowsky which run both version of programmers. It could be found at : Adam’s Home Page ISP PROG ATMEL89Sxx. Every programmers used its own ISP cable. There are many kinds of pin connections between these programmers, but I alredy tested for both of these 2 kinds of programmers. They are more reliable, among any kinds of LPT port from each computer. Some people succeeded while the other not. Some of them suggested using an IC buffer to interface the LPT parallel port, but I tested it with direct cable connection. It doesn’t matter, all can run smoothly. For AEC ISP cable, the connection could be found from the software itself or from Ibrahim Kamal design. Asim Khan ISP PGM cable could be found at : cheap Loader Cable of Asim’s ISP for 89S51/89S52, Adam’s programmer could be use any kind of cables connections, include for both of those cables. But I did not test all of the connections. Asim’s ISP PGM cable is the same as SI Prog cable option. Both of these cable connection (AEC-ISP cable and ISP-PGM cable) could be run on this software. Some people made these cable connections and tested at their own computer with bad result, while some people were succeed. There was another kind of cable connection. I found it at : mytutorialcafe.com, for using with Atmel ISP programmer software. But I could not run it well on my computers. I think that both AEC-ISP cable and ISP-PGM cable are the most reliable cable connection for any other kind of LPT parallel port from many computers