Full Version: Triple Bios?
Can I make my TSOP (xbox 1.0) to have 3 bioses on it (1x512 and 2x256)? I looked for some tutorials about it, but i found only 2 or 4 way split... So maybe its impossible?
Can I make my TSOP (xbox 1.0) to have 3 bioses on it (1x512 and 2x256)? I looked for some tutorials about it, but i found only 2 or 4 way split... So maybe its impossible?
EDIT: sorry for double post :x
EDIT: sorry for double post :x
No you can't have a 3 way bios, it's either 2x521k or 4x256k.
You can have 3 hacked bios' plus the original if you want
You can have 3 hacked bios' plus the original if you want
technically you could get 256+256+512 with a center off switch, but doing that would give you a frag in several switch positions so it wouldnt be a "clean" 3-way split
You actually CAN run 2x256k + 1x512k BIOS's this way:
1 DPDT switch, call this SW1
1 SPDT switch or a second DPDT switch, just use one pole, call this SW2
SW1:
Common1 goes to A19
one side goes to Vcc, the other goes to GND
Common2 goes to A18
one side floats, the other side goes to the common of SW2
SW2:
one side of the switch goes to Vcc, the other goes to GND, the common is the one attached to SW1
This way, when SW1 switches A19 to Vcc, A18 floats and can do whatever the cpu calls out and you have a 512k BIOS.
When SW1 is grounded, A18 will either be driven to Vcc or GND depending on SW2 to swich either of the 256k BIOS's.
This way, there are no illegal states, and so long as you print up a legend and tape it to the box, you'll know what you are doing.
Good luck.
1 DPDT switch, call this SW1
1 SPDT switch or a second DPDT switch, just use one pole, call this SW2
SW1:
Common1 goes to A19
one side goes to Vcc, the other goes to GND
Common2 goes to A18
one side floats, the other side goes to the common of SW2
SW2:
one side of the switch goes to Vcc, the other goes to GND, the common is the one attached to SW1
This way, when SW1 switches A19 to Vcc, A18 floats and can do whatever the cpu calls out and you have a 512k BIOS.
When SW1 is grounded, A18 will either be driven to Vcc or GND depending on SW2 to swich either of the 256k BIOS's.
This way, there are no illegal states, and so long as you print up a legend and tape it to the box, you'll know what you are doing.
Good luck.
QUOTE(Allegro1 @ Feb 6 2006, 07:20 PM) 
You actually CAN run 2x256k + 1x512k BIOS's this way:
1 DPDT switch, call this SW1
1 SPDT switch or a second DPDT switch, just use one pole, call this SW2
SW1:
Common1 goes to A19
one side goes to Vcc, the other goes to GND
Common2 goes to A18
one side floats, the other side goes to the common of SW2
SW2:
one side of the switch goes to Vcc, the other goes to GND, the common is the one attached to SW1
This way, when SW1 switches A19 to Vcc, A18 floats and can do whatever the cpu calls out and you have a 512k BIOS.
When SW1 is grounded, A18 will either be driven to Vcc or GND depending on SW2 to swich either of the 256k BIOS's.
This way, there are no illegal states, and so long as you print up a legend and tape it to the box, you'll know what you are doing.
Good luck.
Anybody can confirm that working fine?
Sorry for that but I have one broken xbox via tsop flash
QUOTE(sowa99 @ Feb 21 2006, 05:21 AM)
Anybody can confirm that working fine?
Sorry for that but I have one broken xbox via tsop flash
i looked it over a few times and drew out a diagram, i cant see any reason why it wouldnt work
nice job
thanks for answer 
yeah, i've done it before. it's kind of a hackish setup, but if it's what you're looking for then it'll get the job done...
it's essentially like doing a 4-way split but having the ability to disconnect either a18 or a19 completely which makes it a 2-way (512) split. i think my setup was slightly different than sowa99's, but the premise works.
it's essentially like doing a 4-way split but having the ability to disconnect either a18 or a19 completely which makes it a 2-way (512) split. i think my setup was slightly different than sowa99's, but the premise works.
I can`t flash the 512kb bank with 512 bios, it crashes in the middle of flashing 
It goes only with 256kb. Everything is soldered as it should be... uhmm So I have now triple bios with 3 256 bioses 
What`s wrong?
It goes only with 256kb. Everything is soldered as it should be... uhmm So I have now triple bios with 3 256 bioses What`s wrong?
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