Ultimate (iMac) MXM efi rom/vbios thread...

[Rominator]

nothing if you are in US

I'll ask for $5 if you are elsewhere so I don't lose on shipping.

I have 128K eeprom chips aplenty as I take them off GTX cards to replace with 256K, so chip itself is free for me

[mugen888]

Rominator, Thats fine do you have paypal account and can send money to or you can request payment from my email (check your messages).

Just to make sure, it is a 1028Kb EEPROM and not a 128kb as you have described?

Many thanks.

[Rominator]

There are different ways to name the size, we are both right.

The part numbers for the chips you discuss are tyipcally like "25vf010" which I refer to as 128K. The PC cards have  part number like "25VF512" which holds 64K and the 256K chips used for the newer roms are like "25vf020" or "25DQT20"

[mugen888]

Rominator, Can you still flash and sell me the EEPROM, if so how do you want me to pay you?

Many thanks..

[Rominator]

happy to

attach what you want flashed to your next post

pm me your mailing address

[mugen888]

Hi Rominator, as far as i know i need Atmel AT25F1024AN EEPROM flashed with an original iMAC Nvidia 7600gt rom.

Im still confused with the size. 1024kb = 1mbit. Thats not the same as 128kb.

In earlier posts aurejac mentions 128kb but nutmann mentions 1024kb.

I have messaged you my address.

Much appreciated for doing this.

[mugen888]

Rominator, im no longer confused after reading the specification for the EEPROM.

http://www.arrow.com/item/detail/atmel/at25f1024an-10su-2.7

[Rominator]

OK, yeah the naming is confusing, the easy way to look at it is the size of the file that fits.

Most Mac roms prior to GTX285 were 131,072 if you asked the finder. I always though of this as 128K.

PC cards had roms of 65,536 which I called 64K.

As for me it was always about which chip was needed to fit which file, the whole 1MB thing didn't concern me.

We have been down this week with a nasty flu, we should be up and running by this weekend and I will flash and ship a chip to you.

[mugen888]

I soldered a leg to the broekn EEPROM and then soldered the EEPROM to the ACER card but no sucess when i tried to boot the imac.

Rominator, i am thinking of getting an EEPROM programmer which one do you own?

I dont know much about them but i have contacted the sellers on ebay and they have told me that the programmers are able to flash the Atmel AT25F1024AN.

Will these do the job?

http://www.ebay.co.uk/itm/221201234392?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

http://www.ebay.co.uk/itm/110750656188?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

http://www.ebay.co.uk/itm/110957292723?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

The only concern i have is that the rom files are not supported by the programmers, but is it a universal thing that these programmers can recognise any rom files?

your help is much appreciated.

while im waiting for your EEPROM, i will attempt to do flash one myself and if i fail then i will just use yours.

i will get there in the end...

[mugen888]

Oh and get will soon

[mugen888]

Nutman,

I like to do the research myself without too much help from others.

After hours of googling ive learnt so much, i now know what a blind flash means.

thanks for offering to send me the files and notes etc. i think i only need the one file which is the imac 7600gt original rom file.

i really appreicate your help in the previous posts. Thank you..

[mugen888]

ive just realised that ive been posting that i have an ACER Card when i meant an MSI card. I need some sleep...

[nutman155]

@Mugen:

You are a lucky guy. Cause MSI card means it
will propably have DDR3 RAM on it, which the iMac
card also has

[stel maar]

Hi,

I'm new here. I come from Europe so sorry for my bad English and I follow this topic for a while.
I have a bad iMac 8.1 with a NVIDIA 8800GS. So it's possible to solder EEPROM chip off from the original 8800GS and place it on a other 8800 card?
And which cards are compatible for this method?
Some posts above I saw the MSI, because it have DDR3 RAM. But are there more?

Many thanks.

[ziofunk]

Hi
sorry if the question I ask could be already be answered reading the post, but I did read all the posts, and I am now a little lost. I have a late 2006 Imac (24") mu graphic card (Geforce 7300) is gone. A specialised service tried to fix it already 3 times but with no results. Now, bisides, finding a refurbished one on ebay (that I dont find anyway) do I have other options? Is there another board where I could flash a different firmware or replace the eprom with the one of my broken card?
Thanks