You could use the new master to reprogram the new slave. The pair of DT104 SimmStick's requires a minimum of 4 components on each board to work. Ben Hitchcock of Wollongong Australia , has taken this a step further and this page, including the New Asm and Hex files, has been updated by Ben. The way that this works is that there is an AT90S1200 AVR chip connected to the simmstick bus which acts as a master, and another chip on a simmstick that acts as the target. The computer sends the program down the serial line, and the master does all the hard work of programming the slave.
People have trouble understanding the concepts.
I sometimes feel like it would take a large book to get the message across. No, it's for everyone. I see a major function as being for industrial control applications. I believe this project is a good example of just one Simmstick concept. In the picture at the top of the page, you can see that the base board used here is a DT-003.