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[scoobster]

Is it possible to set up a switch to boot 2 different bios from TSOP?

[archon76]

QUOTE (scoobster @ Dec 9 2002, 03:49 AM)

Is it possible to set up a switch to boot 2 different bios from TSOP?

                                    Sure.

I am running 4 256k bioses from the TSOP (on the XBOX motherboard).  It was not a problem since you did not have to solder on the TSOP.  There are two points on the motherboard that are alternate solder point for A18,A19.  

[scoobster]

Sweet, do you know of somewhere I can see a diagram of these points?

[archon76]

Here is a diagram of these points with a ground close at hand.  The points are normally high so to change states you need to ground them.  The point are marked but not highlighted on the picture.

I flashed my bios with a multi part(4x256k) 1meg image.  Set both points to high so you can flash the whole chip.  

here                                    

This post has been edited by archon76: Dec 9 2002, 06:13 AM

[essence25]

I don't know why is everyone avoiding this question..

How can you install 2 x 512k bioses (NOT MULTIPLE OF 256k), real 512k bioses onto the xbox 1mb TSOP.


What needs to be jumpered in order to access half of the TSOP at a time not a quarter.

Please do not make any references to the 4way tutorial. I need to know a dual real 512k bios switch.

Does anyone know ?

I ask this because I accidentally flashed 512k real size bios to the 1mb tsop and I don't know how to make the tsop access half of itself. not bank 1,2,3 or 4 but bank 1&2 at once as 1 bank of 512k.



let's see...

[PsiDOC]

Essence
Using 512K of the bios, Instead of 256k is easy. All you need to do is switch A19 between Ground and VCC. Just leave A18 alone
This is the way my own system is set up. I could have gone for 4 256K's but I was too lazy to fit the switch to A18 as well!! lol
Regards,
Psi