What systems can have "universal" ROMs work for them? I know how to make ROMs that can simultaneously get past the security of both the v1.0 and v1.1 MCPX ROMs, but what about the hardware support? The Xcodes and that MCPX initialization table in the first 64 (?) bytes of the ROM can be quite different between versions. Is there a hacked ROM that is truly universal, as in works on all know retail systems? Or does, say, v1.6 always require a different ROM than the others? I understand the Xbox boot process very well, just not the hardware, so I don't need to know about that part. I was the person who, when v1.1 was released, came up with a way to dump the MCPX ROM without having to repeat building the crazy HyperTransport logic analyzer that bunnie made for the v1.0. I've never been a hardware person, so it was Andy Green who actually executed my attack, but it worked - that's how v1.1 was dumped within days and Nvidia's multimillion-dollar write-off was completely wasted. (In case you're curious, the trick was the A20 mask, a holdover from the IBM PC AT. Assert A20M# on the CPU, and it boots from 0xFFEFFE00 instead of 0xFFFFFE00, and the former address is controlled by a mirror of flash, rather than the MCPX. Boot up like this, take control, release A20M#, then dump out the MCPX ROM.)
I found out that v1.6 uses a different EEPROM key. Annoying but not fatal. Is there a way to differentiate v1.6 from the others in software? Like, is the Xcalibur always a v1.6?
The aladdin xt2+ chips have an EVOX BIOS that works with all versions ox xbox if that helps... no idea on tech stuff though
There was an evox BIOS years ago that was leaked, unfinished, that worked across all versions. It would brick consoles after awhile. I don't remember the cause. Guy from SmartXX leaked it with a warning it would brick boxes after hours of run time. I don't remember the specifics anymore
