CRC's..Checksums.. Reverse Engineering!

[Tazzi]

Heres something for anyone who wants to play along. I dont know if it will handle all bins or not, but one way to find out......

Your assuming they have bins to play along with

[antus]

Good point. Ive dropped a couple in the bin file area here:

http://pcmhacking.net/forums/viewtopic. ... p=403#p403

[VX L67 Getrag]

I've been chucking together a start point for an xdf & will post up later for being picked apart!

I'm not sure how to work out the calcs, but can sort that out later!

[VX L67 Getrag]

O.K. so the 12612381 seems the most common for the early E38's so thats what I started with & here it goes...

Obviously it all makes no point without being able to fix ALL the checksums after changes are made & then being able to read/write the .bin file.

ALL the checksum changes look a lot like what I was seeing with the E55 files!

[Tazzi]

O.K. so the 12612381 seems the most common for the early E38's so thats what I started with & here it goes...

Obviously it all makes no point without being able to fix ALL the checksums after changes are made & then being able to read/write the .bin file.

ALL the checksum changes look a lot like what I was seeing with the E55 files!

All checksums have been sorted
Changes can be made in bin and checksum can be recalculated correctly. Its all down to identifying each parameter for each OSID.

[VX L67 Getrag]

A bit of help identifying the parametres would be handy, I believe & think there must be some cryptic info out there for them!

[Tazzi]

A bit of help identifying the parametres would be handy, I believe & think there must be some cryptic info out there for them!

Would be nice if the bins had a simple index outlining each parameter, its location ect. But something like that would probably only be seen /understandable after identifying the chip on board then disassembling the bins and flowing the routines. Might even be lucky enough to find an emulator

[VX L67 Getrag]

I have pulled the cover off 1 recently & no such luck with seeing what chip it has, it's only the back of the PCB thats visible & that is secured in SUPER strong to the metal cover, so there's no real chance of seeing whats on the board.

[kojab]

[slewinson]

Looky here....... http://www.355nation.net/forum/tuning/6 ... elphi.html. Even has some disassembled code and tuned bin files.

68K here we come

Simon