What should my batch file look like for cudaminer for maza? I'm not sure what sha256 affects. I've only mined simple scrypt coins on my lowly gtx670.

Currently I have 

cudaminer.exe -i 1 -l K7x32  -C 1 -H 1  -o stratum+tcp://mzc.rocketpool.co.uk:3333


And it just gives me "Boooo" result constantly at about 300khash.