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Author Topic: Paroanoid  (Read 28 times)

bob90a

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Paroanoid
« on: February 19, 2004, 10:12:00 PM »
QUOTE
QUOTE (A@ron @ Feb 19 2004, 03:13 AM)
so autosizing like evox, nice. Does this feature work with a MultiBIOS tsop? I used raincoat .501 to read and backup the origional bios on a multibios tsop, so it should have been 512kb but it was actually reported as 1MB by linux. So is this BIOS blank or corrupt past 512kb? Is this a glitch?

A@ron

I assume you had a switch on A19.  The BIOS is always the same size, regardless of the switch settings, you're just forcing the Xbox to read the same part of the chip twice.  The second half of your saved BIOS file would just be a copy of the first.  It ain't a glitch, you've just got to understand how the switches work.[/CODE]


i have a v1.0 with a 1 meg bios that i want to do a multi-bios, but when i have the switch set either way, it gives me a 1 meg bios when i backup in raincoat.
many people say different things

QUOTE
the only way Ive noticed is if you use raincoat to read the bios, so:
./raincoat -r orig_bios.bin
And then check the file size, if it is 512KB then A19 is grounded and the tsop is split. Also if properly split the erase and write procedures will take less time

A@ron


well i have a switch with a light and the light comes on so that might be a sign of it working, but the light is very dim.
and should i use 5v instead of 3.3v because some are saying that...

so really, is there a way to test to see if my grounding of a19 works?
should i flash it with a 512k or 1024k bios when a19 is grounded?

please fill me in  :)

This post has been edited by bob90a: Feb 20 2004, 06:15 AM
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Exobex

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Paroanoid
« Reply #1 on: February 20, 2004, 06:46:00 AM »
Raincoat will ALWAYS backup the whole chip.  Or at least, what it THINKS is the whole chip.
If you ground A19 for example, raincoat will read the first half.  When it tries to read the second half, it tries to push A19 high, but as it's grounded it stays low.  Raincoat doesn't know this though, and reads the first half of the BIOS again.
If you connect A19 to Vcc, raincoat will read the second half twice.

Assuming you've got three-position switches on A18 and A19, with "on" representing Vcc and "off" representing ground, the following is what raincoat will put in the file:-

CODE
A19  A18  Banks
off  off  0+0+0+0
off  mid  0+1+0+1
off  on   1+1+1+1
mid  off  0+0+2+2
mid  mid  0+1+2+3
mid  on   1+1+3+3
on   off  2+2+2+2
on   mid  2+3+2+3
on   on   3+3+3+3


Whether you use 3.3V or 5V may depend on the chip.  Some run at 3.3V.  Some run at 5V.  Some can run at either voltage.  If 3.3V works, stick with it.  Check the manufacturer's datasheets before putting 5V on those lines!  Even then, I'm not sure if the MCPX would be too happy about it!

This post has been edited by Exobex: Feb 20 2004, 02:50 PM
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bob90a

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Paroanoid
« Reply #2 on: February 20, 2004, 10:55:00 AM »
ok,  so no matter if a19 is grounded or not, it always gives me a 1024k bios backup...gotcha.

is there any other way to check to see if a19 is grounded correctly?

and if raincoat always sees a 1024k image when a19 is grounded, do i flash with a 1024k or 512k bios?

and if i accidentally flash a 512k bios to a 1024k chip, whats the worst that could happen?



This post has been edited by bob90a: Feb 20 2004, 07:00 PM
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BaDvs3viL

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Paroanoid
« Reply #3 on: February 20, 2004, 12:05:00 PM »
Well....If you go ahead and flash with a 512k bios, it will tell you how much it is flashing and lets say the worst happens and it says 1024k.....The xbox will frag and you will have to fix that ground to make it boot
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