Arcade Collecting > Merit/JVL Touchscreen

max

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ed12:
this is u12/u13
u10 i am thinking about
legal for the site etc...
but this should get u going
remeber the dallas chip beside u13 is useless

ed

mahkeymike:
What exactly are these u12/u13 purpose? Do they contain config data for specific game versions? I am willing to bet that these old XL/Maxx systems used Dallas square security chips that only hold the unique ROM ID to tell the software it matches. Then the u12/u13 would hold config data for specific game year and country?

Just trying to understand and compare to how Force/Ion works. In which the ibutton key contains both the unique ROM ID and the connfig data via Non Volatile memory (NVram).

ed12:
ok this much we can go public with
u10 hold's the unquie key..which is hashed..that aside
u12 hold's all of the game's data
u13 which is a flash chip hold's the game id >hash routine< and serial #..
it is contained in flash so as to never be removed >power loss/battery loss< etc
but that said it is :flashed: so it can be re-writen on the fly..old school thinking here
that is the way to c it..
with the .img's u can in asci perty much see it and edit it..
but understand, u must which i know u do mike, understand hex-editor's
and hexcsum..
but these 2 file's put u square in the driver's seat
the key is olny used for the first and second layer chk's of there mbr..why i do not know?
but my best guess is to make sure it is the proper game,and harddrive..
seem's a little to controlling to me..but whom am i to guess the mind's of now un-paid eng's

ed

mahkeymike:
Ok this is making more sense. When they switched to the ibutton key with XL/Maxx , did you still need u12/u13? Because the ds1995/6 ibuttons contain all of it (unique id, serial, game data)

ed12:
all but game data..ie game's
but every thing else is contained in the i-button
reason is it is 512k + where the small chip is at best 1k
the hash take's place between the harddrive and the i-button
where in max it was done in the flash
this was the reason for the :branding's:
of the mbr..and not because of size..as most ppl had thought
i can blow that theroy out the door in a new york sec..
same with ppl saying u cannot run sata in a ion which came with a ide..i go wtf are u talking about?,it is board support layered...
but back on topic,if u disamble the eprom,u are more then 1/2 the way there...i cannot stress that enough...!!!!,the flash was inculde..so  could see the key is truly not required..
in the ion's they did a 4 chk-sum of the mbr layer..hence the reason u see the game reboot
serval time's /root/echo on,if i rem the cmd right..and u will see it do a chksum
that is it polling the :key:.......

the olny reason they went to the i-button which i should use the @r
is because dallas put the other 1 on the nla list..

ed

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