Printhead module capable of printing a maximum of

1. A printhead module capable of printing a maximum of n channels of print data, each channel being associated with rows of printing nozzles of the printhead module, the printhead module being configurable into:

a first mode, in which the printhead module is configured to receive print data for a first number of the channels; and

a second mode, in which the printhead module is configured to receive print data for a second number of the channels less than the first number and dummy data for a portion of each nozzle row associated with the remaining number of the channels,

wherein the first number is less than n.

2. A printhead module according to claim 1 , configurable into at least one other mode, in which the printhead module is configured to receive print data for a corresponding number of print channels other than the first and second numbers.

3. A printhead module according to claim 1 , wherein n is 4 and the second number is less than 4.

4. A printhead module according to claim 1 , wherein n is 5 and the second number is less than 5.

5. A printhead module according to claim 1 , wherein n is 6 and the second number is less than 6.

6. A printhead module according to claim 5 , wherein the second number is 3 or 4.

7. A printhead module according to claim 1 , wherein the selected mode is selected based on the contents of a memory associated with the printhead module.

8. A printhead module according to claim 7 , wherein the memory is a register.

9. A printhead module according to claim 7 , wherein the register is on an integrated circuit, and wherein the integrated circuit and the printhead module are mounted to a print engine.

10. A printhead module according to claim 1 , comprising a plurality of printhe ads.

11. A printhead module according to claim 10 , wherein each printhead is a pagewidth printhead.