Very nice video Keoni

I wired some stuff the wrong way around. Using my oscilloscope and debugger cable I managed to track down the bug. Now the backup cartridge has F8 bankswitching hardware! Yay! I can play E.T. now (which is an F8 bankswitching game) along with 15 other 8k games. I can put 4k games on this cart as well.

No, those advanced graphics took up most of the space.

Edit: cleaning up the source of my computer program to allow for easier implementation of various bankswitching methods as well as bankswitch detection.
Edit:

I almost finished building my second multi-cartridge. This one has F8 bankswitching hardware built in. It can hold up to 16 8k games or 16 4k games (gets copied twice to the cart so when a bankswitch occurs it does not affect the game)
After cleaning up the code of the pc connectivity tool that goes with the cartreader I could easily make changes to the bankswitching code. The cartreader still only supports F8, but F6 is pretty easy to implement too. I do not own any F6 games to test it with, so I am going to have to get some F6 games first.

It seems like I don't have to make any hardware modifications to the cartreader, so I will solder up a prototype and put it in an enclosure soon!

More pictures: http://8times8.host56.com/?p=345
Soldered the device up and put it in an enclosure. Almost finished!

I was messing around trying to come up with the best solution to put it all together. Hot glue and a plastic back on metal is not ideal. I have to come up with something that sticks better.

I took this piece of plastic from an actual atari2600. Normally you'd find the game select switch next to the cartridge slot. I slip the programming cable that is required for my multicartridge trough this hole .