Computer processing power has advanced to the point where individual chips can be microscopic in nature, allowing for the tiniest of machines to exist and ensuring that any device from your toaster to your thermostat to your bullets can be completely augmented with computerization technology. A single chip the size of an SD card (or quarter) can operate as any one of the following:
Datachip: A mass-produced datachip this size can hold approximately 4 petabytes of information; the largest chips hold 128 petabytes (and are prohibitively expensive, in most cases.)
Transceiver: Any device can have the ability to serve as an Uplink and have basic processing capabilities while still being able to store 1 petabyte of information on a mass-produced slottable chip.
Processor: A processor chip this size would operate as its own node within a larger machine, allowing it to handle moderate processing tasks as a Tiny computer with its own programs and configuration.