$11 Checksum

[VX L67 Getrag]

Is there any reason there is no checksum in xdf header for any of the $11B xdf's?

I just created 1 for data between $4000 to $FFFF & data stored at $6006 which is 2 bytes, is this correct or not necessary?

I'm guessing if it is necessary everyone in the passed just AA the prog id?

Also does anyone know what the byte at $9988 in BLCC is for someone has changed it randomly from 37 to 36, guessing it can only be a coding change?

[Jayme]

I beleive for $11 its not a simple checksum calc, you need to calculate two separate blocks and add them or something, which tunerpro cannot do. as a result nobody could be bothered writing and/or using a plugin to do it when you can just use AA

edit: link
https://pcmhacking.net/forums/viewtopi ... sum#p16142

[VX L67 Getrag]

LOL thanks Jayme, looks like I looked into it a while ago & must have forgotten, anyone would think I drink too much or getting too old!

Yeah AA is the go then! Thanks again!

[antus]

Hmmm you have just reminded me of a checksum plugin I wrote for this but forgot about (since I never needed it myself). Try dropping this DLL in to your my documents/tunerpro files/plugins directory, and set up your XDF checksum tab like this. If it works, please post back a confirmed good xdf. Note that checksum plugins dont list under about->plugins so the only way to confirm its loaded is to see if the options to use it are there when you configure the checksum in the XDF.

setup2.png

[VX L67 Getrag]

Oh Cool, LEGEND Antus thank you so much!

I'm about to do a BIN for another member so I'll have to rely on him to report back the checksum worked!

[VX L67 Getrag]

If this does work for this does that mean there may be a possibility for the VX-VY files too as I believe there similar?

Thanks again Antus, fingers crossed!

[antus]

Im not sure what effect the data in the eeprom has on that. maybe. I havnt looked at this stuff since mid 2011!

[VX L67 Getrag]

Just checking I have the settings correct as in the XDF it actually said 4000 to FFFF so it was obviously wrong too!

[antus]

Yeah my notes say for $11 its 5000->FFFF and $83/$84 are 4000->FFFF

[VX L67 Getrag]

Cool good to know, let you know if the $11 Works!

EDIT: Just with a simple VATS remove on BLCC it used to change both bytes a fair bit, now with checksum plugin it just changes the 2nd byte by 1 bit higher from 54 to 55, this seems a lot more correct to me!