Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which model has a maximum memory of 512 mb?

### Inputs:
table_name: table, columns: ['Model', 'Introduction', 'Discontinued', 'CPU Speed', 'Print speed (PPM)', 'Standard memory', 'Maximum memory']

### Response:
SELECT MAX Model FROM table WHERE Maximum memory = 512 mb