The Raspberry Pi single-board computers or SBCs have long been the darling of makers and tinkerers because of their size and their price. The RPis, however, have also served as the foundation of more formal products that take advantage of the platform more than just the package. For these types of uses, The Raspberry Pi Foundations has provided smaller but also less featured Compute Modules and the latest version based on the RPi 4 shrinks that size down even further with one important consequence.
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https://www.slashgear.com/raspberry-pi-compute-module-4-comes-in-a-more-compact-form-20643396/
