Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_68 ( memory_map VARCHAR, model VARCHAR, byte_string VARCHAR, max_memory__kwords_ VARCHAR )

### Question ###
On a Sigma 9 with a standard byte string and more than 128 max memory, what is the value of the memory map?

### Accurate SQL ###

SELECT memory_map FROM table_name_68 WHERE byte_string = "standard" AND max_memory__kwords_ > 128 AND model = "sigma 9"