Rebuilding Bios

[steve6386]

Hi again,
Phoenix Bios Editor seems to be a non starter so back to good old Prepare & Catenate.
I believe but may be mistaken that Prepare just compresses the modules or the ones that need to be compressed.
So what in ROM.SCR tells it which to compress ?
I also believe again maybe mistakenly that Catenate rebuilds the .mod files into a single bios file and fixes the checksum.
So what in tells Catenate where to put them, I know its not just the order that they appear in ROM.SCR, so does Prepare.exe add something to the .mods to say where catenate puts them or is it something to do with the switch's in ROM.SCR ?
Cheers
Steve.