USB Mass Storage (UMS) and proprietary extensions for fx-CG calculators

In order to behave like any other USB-attached storage with their “USB Key” communications mode, fx-CG calculators implement USB Mass Storage (UMS) with Bulk-Only Transport.

The following sections describe CASIO’s usage of UMS in this context.


Extensions to the SCSI protocol embedded within CASIO’s UMS implementation still support a stream interface for communicating using Protocol 7.00 or Protocol 7.00 Screenstreaming over UMS; see Custom SCSI commands for CASIO’s USB Mass Storage implementation for more information.