Yes you can edit the tattoo, and you would need to change the format switch specifically to achieve this. Alternatively, in SmartRestore you can double click on the yellow house, and it will show a technical support box asking for a code. I have yet to determine how this works, but for now I modified it to accept any/no code. This unlocks all the software available on the particular Master CD for that system, even if the system wasn't originally supposed to have it. Attached is a work-in-progress restore 'matrix' for the UK Hercules format as listed on my Master CD set.
In the format part codes section, RED indicates that archive is never copied to the hard drive, ORANGE indicates it is copied but may not be used.
In the format switch section, GREEN denotes that the associated software will be installed, RED indicates it will not. Some software may be RED in the switch section, but YELLOW in the part code section - the CD will copy the software to the hard drive, but will delete it straight after the restore without installing it...
To check the tattoo in the BIOS, run BIOSPEEK.EXE from C:\DRIVERS, and choose PRELOAD INFORMATION. If the values are empty, then you should tattoo the system from your hidden sectors or the BIN backup file. Do the same thing, but with HDPEEK.EXE to check your hidden sectors are still OK. If they are, it's a case of running TATTOO.EXE /CREATEDMIFROMHS. You can then use BIOSPEEK again to verify that the tattoo went OK.
And thanks for those CDs - I’ll get to work analysing them soon.