Just a note on the C-64 versions of BT1:
* I have all three different original C-64 versions of BT1. They are stored as nibbled .G64 files. Let me know if you need them.
* Most - if not all - the D64 versions of BT1 are cracked. Side A of BT1 is copyprotected (as I have mentioned elsewhere). A standard D64-image can't contain the copyprotected data.
* All cracked versions only have A-sides that differs. No cracker have changed the in-game loader in any way. No cracker have compacted or changed the actual gamefiles.
And yes, i've looked through all the BT1 cracks in existance. 