Multiple cartridge printhead assembly for use in an inkjet printing system

A printing system, comprising:

• a first substrate having a first array of ink ejection elements formed on a surface of said first substrate for ejecting droplets of a first ink;
• a second substrate having a second array of ink ejection elements formed on a surface of said second substrate for ejecting droplets of a second ink;
• a first housing having said first substrate mounted thereon, said first housing having first electrical contacts connected to said first substrate;
• a second housing having said second substrate mounted thereon, said second housing having second electrical contacts connected to said second substrate;
• a memory element located on said first housing, said memory element being in electrical connection with a memory electrical contact on said first housing, said memory element containing x-axis alignment parameters that relate droplet ejection characteristics of said first array of ink ejection elements and said second array of ink ejection elements;
• means for affixing said first and second housings together to form a print cartridge assembly;
• and
• a scanning carriage to which said print cartridge assembly is mounted, said scanning carriage having carriage electrical contacts in electrical connection to the first and second electrical contacts on said first and second housings.