OK, before you start flaming me please read my whole post. I have done alot of research, read every tutorial I could find, and I still have one question. I do not need a how-to, or someone to hold my hand, I just need a simple yes or no answer. I have found a way, through someone's tutorial, to mod my xbox (v1.0) so that I can have the TSOP split in two by a switch. On the last half is the standard MS BIOS, and I wish to put an x2 bios on the first half. Switching between these two memory 'banks' is done by external switch. Here is my question: can I flash a 512KB bin on the first half of the chip, such as a x2 50** BIOS (or more specificlly, will it work if I do do this).

Yes, it will work. Just make sure you use a x2 bios (like x2 50xx) and not a x3 bios (they will only work on x3 hardware).

thanks! that was fast, and exactly what I needed!

and make sure you use a SPDT switch hooked up like the TSOP split pic in my sig (older methods wont work with the bios you want to use)

Ok,got through most of it. I wired everything correctly (thx for the pic LV) but when I had splintercell load the saved game, it didn't work the first many times. I was transfering the files to a friend's xbox, then using a memory card to put them on mine. The org file wouldn't fit, so I slimmed it down, and finally got everything to work until... I tried to flash the bios through evox. It froze at around 1/4 of the way. Now I was smart enough not to have lost my MS Dash, but I can't get it to flash correctly. I do have the switch set to switch between Ground, 3.3v, and a19, and it works correctly (like I said I can still boot into MS Dash). But when I try to flash the bios, it always freezes. Any ideas? Someone said raincoat, but I'm under the impression that raincoat only works with Winbond TSOPs.

raincoat works with all TSOPs, it just has to be used with winbonds since evox cant do winbods, so give it a whirl and see what comes up

try getting a new copy of your bios too, and resolder the write enable points