page Formats: XML Embed Edit Step 1 — A4 Processor Basics  ¶  Apple's A4 microprocessor is the brain of the iPad. The A4 is an ARM processor featuring package-on-package construction to improve the speed and efficiency of internal processes. The silkscreen on the A4 reads N26CGM0T APL0398 339S0084 YNL215X0. But that's