[Techtoolslist] 9100 ROM Signature Algorithm

[John Robertson]

Archive is at: http://www.vectorlist.org/ for files prior to around 2005...

John :-#)#

John Robertson wrote:
Martin White wrote:

> On 26 Aug 2010, at 16:22, John Robertson wrote:

>

>  

>> martin at guddler.co.uk wrote:

>>    

>>> Hi John.

>>>

>>> Unfortunately that's all for the 9010. I'm talking about the 9100 

>>> and the sigs are different.

>>>

>>> Martin

>>>  

>>>       

>> Ah, right - didn't the 9100 just use regular checksums for its 

>> 'Signatures'?  In which case there is RomSum.exe that will generate 

>> checksums for individual files or entire directories, printing the 

>> results to screen or piped to a file.

>>

>> John :-#)#

>>     

>

>

> It doesn't seem so, no.

>

> I just went and read in 'galtest.bin' the (or a) galaxian test rom.

>

> Here's what I get (the first ones are various CRCs my programmer can 

> produce):

>

> The layout will probably be messed up so sorry about that.

>

>         Sum        Neg.        Suppl.

> Byte        00050839    FFFAF7C6    FFFAF7C7

> Word        028BB800    FD7447FF    FD744800

> Byte(CY)    00050839    FFFAF7C6    FFFAF7C7

> Word(CY)    028BB800    FD7447FF    FD744800

> CRC-CCITT    D8F7        2708        2709

> CRC-XModem    548D        AB72        AB73

> CRC-32        0614CD7F

>

> Fluke 9100    052C

> Fluke 9010    4AFE

> RomSum    0839

>

> As we can see at the bottom here, the three we see in the arcade world 

> are all different. I grabbed RomSum from a link on the flippers site 

> so I assume it's the one you're talking about?

>

> Apologies to those on the list who are not here from the arcade world!

>

> I'm going to go investigating further.

>

> Martin.

>

>   


I did a dump of the signature Rom generation code (using an Arium ML4100 
as I recall) to help figure out what the Fluke 9010 signature 
was...check the archives back in 2002 - Oct and later first under 
"Signature" then under "Cracking" for the subject line.


John :-#)#


>>> On 26 Aug 2010, at 00:49, John Robertson <jrr at flippers.com> wrote:

>>>

>>>  

>>>      

>>>> Martin White wrote:

>>>>           

>>>>> Hi all,

>>>>>

>>>>> I'm pretty sure the answer to this is no, but did anyone ever work 

>>>>> this one out? Ie how to calculate the sigs from ROMs?

>>>>>

>>>>> It's never really been a show stopper for me since I check against 

>>>>> the CRC32 sigs first thanks to a script that Andy Welburn posted 

>>>>> up some years back (with assistance from Chris Hardy I believe?) 

>>>>> and then when I know a ROM matches and the fluke can read it 

>>>>> in-circuit ok I then use the 9100 to get the 9100 sig.

>>>>>

>>>>> It's a bit of a drag though as the CRC32 calculation is kinda slow 

>>>>> (even on the FT) so it would be nice to have the 9100 sig up front.

>>>>>

>>>>> Martin.

>>>>>                 

>>>> Hi Martin,

>>>>

>>>> Yes, that was worked out and made into a nice utility program that 

>>>> you can download from Quarterarcade (a big THANKS to James Bright 

>>>> for this work!) @

>>>>

>>>> http://tech.quarterarcade.com/tech/Fluke/9010A/

>>>>

>>>> The FIDE software allows you to input your files that you want ROM 

>>>> Signatures and it does the rest.

>>>>

>>>> John :-#)#

>>>>         

>

> _______________________________________________

> Techtoolslist mailing list

> Techtoolslist at flippers.com

> http://seven.pairlist.net/mailman/listinfo/techtoolslist

> FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment

> Archive site: http://seven.pairlist.net/pipermail/techtoolslist/

>

>

>   





-- 
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
                 www.flippers.com 
"Old pinballers never die, they just flip out"