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==== CAMAC ====
A later crate standard is [[Computer Automated Measurement and Control|Computer Automated Measurement and Control, or CAMAC]]<ref>{{cite web|title=AN INTRODUCTION TO CAMAC|url=http://www-esd.fnal.gov/esd/catalog/intro/introcam.htm|publisher=FNAL|accessdate=21 September 2013}}</ref> . CAMAC modules are much thinner than NIM modules. The backplane connector of a CAMAC module is a card-edge connector; because of the possibilities of mis-aligning the connectors upon plugin, CAMAC modules are NOT [[hot swap|hot swappable]]. The CAMAC backplane contains a signally protocol for the crate controller to set the values of registers in modules (for configuration) and to read values of registers (for data acquisition). Due to the slowness of the data communication along the backplane, once FASTBUS was invented, CAMAC modules were mostly used for modules that needed to be computer-configured but not for data acquisition.
==== FASTBUS ====
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