EEPROM on A1200?

[TjLaZer]

Step 2: Fill addressable unused memory space for both eproms
Now, we're going to copy the contents of addresses 00000-3FFFF to 40000-7FFFF for U6A_tmp.rom
To do this, in WinHex select: Tools -> FileTools -> Concatenate
Type in destination file for a blank rom file to be created (eg. U6A.rom)
Append file U6A_tmp.rom to U6A.rom
Repeat this again, append source file U6A_tmp.rom to U6A.rom
Select Done and a message box will appear: 524288 bytes from 2 files were concatenated to "U6A.rom"

Hmm when I did it I omitted step 2 and it worked for me!