Intel D865GLC BIOS chip location (Tektronix TLA5000, TDS5000 series HW)

[newtekuser]

I'm trying to dunp the custom BIOS off a motherboard that is used in the Tektronix TLA5000 and TDS5000 HW but I cannot find the BIOS chip.
There's no winbond chip and all 8 SOICs on the motherboard are not eeproms - I took the numbers off them and googled for the datasheets. I could have missed some...

[feedback.loop]

Have a look at that Intel chip on the bottom left

[coromonadalix]

a simple search,  this is an original

p25 version

sure you wont have the tek logo, and crippled settings

there is some commands on the tds7000 series who create a dump of the cpu bios   check in the tds7000  tds7k threads

i use an original intel bios in the tds7254 at our job  .... wayyyy better  loll i dont care about the tek logo,      but the display settings may fuck the lcd screen, be sure to be able to rset the cmos/bios

You have to be sure of the resolution, start with low settings  loll

[newtekuser]

a simple search,  this is an original

p25 version

sure you wont have the tek logo, and crippled settings

there is some commands on the tds7000 series who create a dump of the cpu bios   check in the tds7000  tds7k threads

I do have the vanilla version, but wanted the oem verion with the tek logo.
Thanks though!

[coromonadalix]

 

you wont get it unless you remove the chip ...... dangerous procedures   or search   as i wrote  for the script

[newtekuser]

Have a look at that Intel chip on the bottom left

Is that the BIOS chip???  i'm used to seeing them in 8 pin packages.
Are there any existing test clips that would attach to it.
I know I can desolder it but only as a last resort

[coromonadalix]

oh  forgot this  you have uniflash tools  who could be able to retrieve it from windows,  some AV may hate it

https://www.rainbow-software.org/uniflash/


no clips will work, it is not an spi eeprom ... you have to lift it

and yes it is the eeprom

and you havent seen  older  24-26-28 pins dip eeprom  i think  loll

is your mobo dead ?

[newtekuser]

Yeah, seen older eeproms in large dip packages but nothing bigger than 8 pin on modern systems 
And yes, motherboard is complete writeoff. I suppose I can try hot air to remove the chip and save it for later.
I don't intend to destroy my other working motherboard so will leave it at that for now.

[feedback.loop]

Why are you talking about EEPROM?
BIOS is sitting in a Flash. Must be 4Mbit in this case I suppose.

[coromonadalix]

the board used in Tek stuff have an tek boot image and crippled bios settings

sometimes you can't call the bios with the classic DEL or Fxx keyboard,  you have to make them loose the clock settings or other thing   with  killcmos  etc ...

thats why i live perfectly with an original intel bios, i had to "fiddle" lan settings  for visa communications

sure it could be nice to have an original setup ...  more problems than solutions  loll

you mostly need the drivers ....

[newtekuser]

Have a look at that Intel chip on the bottom left

I just found a repair article pointing to the same IC: https://hackaday.com/2016/08/20/repairing-14-tektronix-tla5202-logic-analyzers/ 

[coromonadalix]

for sure if the capacitors look like this, you have to change them, the problems is :    the pcb thickness  will dissipate most of the iron heat, and emptying the holes is another problem

i use an twist drill with very fine drill bits,  this is dangerous, if you are not centered you may break some pcb traces outside and inside the pcb layers ...

you need experience to do so

[newtekuser]

for sure if the capacitors look like this, you have to change them, the problems is :    the pcb thickness  will dissipate most of the iron heat, and emptying the holes is another problem

i use an twist drill with very fine drill bits,  this is dangerous, if you are not centered you may break some pcb traces outside and inside the pcb layers ...

you need experience to do so

I already broke the original board trying to remove a cap that didn't want to come out. My hakko desolder gun was useless.
 Luckily I had a replacement board ready and got back in business but now I'm stuck with the OEM bios chip.
Funny thing is I had already successfully recapped the very same board model in my TDS5054 scope, guess was lucky.
Now I'm trying to dump the ROM off this board and maybe I can flash it onto the replacement board.

[coromonadalix]

And the stupid question is:  with the oem  version, is everything work ?  scope side too ?

use crtl alt del, bring the task manager, kill the scope applications, you will revert in pc mode and use the universal bios dump tool

https://www.majorgeeks.com/files/details/universal_bios_backup_toolkit.html

Make a bios dump ... done that without problems ?

you do it twice with different names to be sure  and Uniflash  to put it back ??

[newtekuser]

And the stupid question is:  with the oem  version, is everything work ?  scope side too ?

use crtl alt del, bring the task manager, kill the scope applications, you will revert in pc mode and use the universal bios dump tool

https://www.majorgeeks.com/files/details/universal_bios_backup_toolkit.html

Make a bios dump ... done that without problems ?

you do it twice with different names to be sure  and Uniflash  to put it back ??

My TDS5054 scope is on the original Tektronix motherboard and BIOS
The TLA5202 has the oem/replacement motherboard and BIOS. It still works fine though. The only difference I've noticed is that the Tektronix motherboard had the Intel 100mbps LOM and the replacement board has 1gbit LOM.

I did dump the flash from the Tektronix motherboard with the universal dump tool but uniflasher doesn't support the Intel motherboard according to the readme due to locked/protected BIOS
There's the iflash tool but that takes files in .BIO format and my dump is a .ROM file.
I could risk renaming it but what doesn't look good is the file size difference: the vanilla BIOS file from Intel is about 600KB and my ROM dump from the TDS5054 original motherboard is 500KB. 

[coromonadalix]

pls  correct your wording,  where did you take the "vanilla" expression

it's an "Intel" original or "OEM" TEK branded that's all

And for the network speed difference, i don't think it will make a difference unless you are a speed freak on capturing the scope data on lan interface ??  I do captures on GPIB port for an 7254   loll

Some board may have 80-90 % of the same components and have some hardware changes / revisions, seen that in the past,   you could create more problems than solutions if you don't find the exact bios

you could take the long road to add the tek image logo in the bios  etc ... etc ...  and still fuck something up, checksum calculations ...

I personally would not even think or even try to mix the models bios .... just for a network hardware speed problem  it seems ?

Locked ??    Yes  in some bios you have flash protection enabled / disabled option.   and as i written earlier, you have to crash the bios with say killcmos  to make some errors and try to enter the OEM bios  ...  and you may loose some important settings.

Had some hard times with the 7254 after dallas chip failed, and the computer cell battery dropped low, i fucked up the screen configs pretty badly and windows was stubborn as hell to reset it

Luckily i flashed the original Intel bios.


If it works  Don't touch it     unless you are stubborn ??

Rename the file, if it is not ok  it simply shouldn't flash

my 2 cents

some readings examples

https://forums.mydigitallife.net/threads/intel-d865gbf-board.12139/page-2

[newtekuser]

pls  correct your wording,  where did you take the "vanilla" expression

it's an "Intel" original or "OEM" TEK branded that's all

And for the network speed difference, i don't think it will make a difference unless you are a speed freak on capturing the scope data on lan interface ??  I do captures on GPIB port for an 7254   loll

Some board may have 80-90 % of the same components and have some hardware changes / revisions, seen that in the past,   you could create more problems than solutions if you don't find the exact bios

you could take the long road to add the tek image logo in the bios  etc ... etc ...  and still fuck something up, checksum calculations ...

I personally would not even think or even try to mix the models bios .... just for a network hardware speed problem  it seems ?

Locked ??    Yes  in some bios you have flash protection enabled / disabled option.   and as i written earlier, you have to crash the bios with say killcmos  to make some errors and try to enter the OEM bios  ...  and you may loose some important settings.

Had some hard times with the 7254 after dallas chip failed, and the computer cell battery dropped low, i fucked up the screen configs pretty badly and windows was stubborn as hell to reset it

Luckily i flashed the original Intel bios.


If it works  Don't touch it     unless you are stubborn ??

Rename the file, if it is not ok  it simply shouldn't flash

my 2 cents

some readings examples

https://forums.mydigitallife.net/threads/intel-d865gbf-board.12139/page-2

Yeah, it's not worth it to me. I'll keep it as it is since it's working fine
Btw, the vanilla expression comes from the linux kernel community
 It describes the original kernel maintained by Linus torvalds as opposed to an OEM version that is customized by a Linux vendor such as Canonical, Red Hat etc.

[coromonadalix]

ok    But  loll it's a Windows based machine not Linux   

[newtekuser]

ok    But  loll it's a Windows based machine not Linux   

True that 

[amyk]

Datasheet: https://pdf1.alldatasheet.com/datasheet-pdf/view/66112/INTEL/N82802.html
This "FWH" solution was somewhat common around the turn of the century, at the transitional period between parallel and serial BIOS EEPROMs.

[coromonadalix]

you had many intel 865 xxx series,  some with more usb ports on the back, etc ... same footprint  but different hardware at some point ...

[newtekuser]

Ok, so I bit the bullet and bought another Intel D865GLC in working condition off ebay and replaced the original Intel BIOS chip off it with the Tektronix BIOS chip from the broken board and successfully got it to work.
I did manage to blow a small cap off the board from using too much air, but luckily I had the "donor" board handy and replaced it.

Almost all electrolytic caps are bulged on this board though and my Hakko de-soldering gun is broken, so re-capping will have to wait for another time. Tomorrow will be time to make the TLA "original" again 

[Per Hansson]

Almost all electrolytic caps are bulged on this board though and my Hakko de-soldering gun is broken, so re-capping will have to wait for another time. Tomorrow will be time to make the TLA "original" again 

What, don't run a board with bad capacitors, you run high risk of damaging the switching regulation circuit when doing so!

[newtekuser]

Almost all electrolytic caps are bulged on this board though and my Hakko de-soldering gun is broken, so re-capping will have to wait for another time. Tomorrow will be time to make the TLA "original" again 

What, don't run a board with bad capacitors, you run high risk of damaging the switching regulation circuit when doing so!

I know, I'm not using the unit though so this can wait until I get a new heating element for the desoldering gun.