avatar_Audronic

Help required to fix Checksum on a Utility rom Please

Started by Audronic, 22:58, 07 January 16

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

Audronic

Hi All
Help required to fix Checksum on a Utility rom Please.
Dropbox - UTILITY.ROM.zip


SORTED, The ROM is Faulty.


Thanks     Ray
Procrastinators Unite,
If it Ain't Broke PLEASE Don't Fix it.
I keep telling you I am Not Pedantic.
As I Live " Down Under " I Take my Gravity Tablets and Wear my Magnetic Boots to Keep me from Falling off.

TFM

You basically add the values from &C000 to &FFFE and keep the result in 8 bit. This byte then gets written to &FFFF.


Or you can use ROManager 2.14 to adjust the check-sum using the Test-ROM option.
TFM of FutureSoft
Also visit the CPC and Plus users favorite OS: FutureOS - The Revolution on CPC6128 and 6128Plus

Audronic

@TFM


Thanks for the info, I did it the hard way
I used MegaFlash Romanager 464/664 Ver 1.45 (TFM)


To Test the rom, Update checksum, Dump rom to disk.
Compared   Rom1 Faulty CheckSum with Rom1 fixed CheckSum
Found the Byte that had been modified at &FFFF.


Thanks    Ray
Procrastinators Unite,
If it Ain't Broke PLEASE Don't Fix it.
I keep telling you I am Not Pedantic.
As I Live " Down Under " I Take my Gravity Tablets and Wear my Magnetic Boots to Keep me from Falling off.

Powered by SMFPacks Menu Editor Mod