CREATE TABLE table_name_68 (memory_map VARCHAR(255), model VARCHAR(255), byte_string VARCHAR(255), max_memory__kwords_ VARCHAR(255))
On a Sigma 9 with a standard byte string and more than 128 max memory, what is the value of the memory map?
    
SQL: SELECT memory_map FROM table_name_68 WHERE byte_string = "standard" AND max_memory__kwords_ > 128 AND model = "sigma 9"