I have a working but non self booting Monkey Wrench II cart.
I dumped the ROM and it's different than the one here and does not auto-start like other versions. It has no data in the 9ffX area to tell the cart to start itself, but if you do USR(32768) at the READY prompt it will initialize.
Looks like I can't attach files. If you would like to check it out you can download it here:
http://www.atarimax.com/tmp/wrench.rom
Steve
Different version of Monkey Wrench II?
Moderator: Atari Frog