Custom SCSI commands for CASIO’s USB Mass Storage implementation#

CASIO makes use of the C0h to FFh vendor-specific range to implement its own SCSI commands.

`0xC0` – Poll status#

This command is a 16-byte command that is run to poll the device’s status. The command format is the following:

The command prompts the device to answer with a 16-byte device status, with the following format:

Offset	Size	Description	Value
0 (0x00)	1 B	Unknown.	Set to `0xD0`.
1 (0x01)	5 B	Reserved.	Set to `0x00`.
6 (0x06)	2 B	Amount of available bytes to be requested.	Big endian 16-bit integer.
8 (0x08)	2 B	Reserved.	Set to `0x00`.
10 (0x0A)	2 B	Activity status.	Big endian 16-bit integer.
12 (0x0C)	4 B	Reserved.	Set to `0x00`.

This command is a 16-byte long command that is run to read available data. The command format is the following:

The command prompts the device to answer with the requested data.

This command is a 16-byte long command that is run to write data to the calculator. The command format is the following:

The command should be accompanied with the data to send.